Documentação em Português

This is an Arduino library for the SI47XX, BROADCAST AM/FM/SW RADIO RECEIVER IC family from Silicon Labs. This library is intended to provide an easier interface for controlling the SI47XX by using Arduino platform. The communication used by this library is I²C. This library was built based on “Si47XX PROGRAMMING GUIDE; AN332 ”. It also can be used on all members of the SI473X family respecting, of course, the features available for each IC version. These functionalities can be seen in the comparison matrix shown in table 1 (Product Family Function); pages 2 and 3 of the programming guide.

This library can be freely distributed using the MIT Free Software model. See Copyright (c) 2019 Ricardo Lima Caratti. Contact: [email protected].

There is a facebook group called Si47XX for Radio Experimenters where the purpose is exchanging experiences with projects based on Silicon Labs SI47XX IC family. You will be welcome to the group Si47XX for Radio Experimenters.

• The SI473 (SI47XX) is a 3.3V part. If you are not using a 3.3V version of Arduino, you have to use a kind of 5V to 3.3V bidirectional converter. It is important to say that just power the Si47XX device with 3.3V is not enough. I mean, on an Arduino 5V board, just feeding the Si47XX device with the 3.3V of the Arduino output is not enough. You have to be aware that the Arduino that operates with 5V, the digital pins and the I2C bus will send 5V signals to the Si47XX device. That configuration can make the system unstable or damage the Si47XX device.
• This library has been successfully tested on Arduino Pro Mini 3.3V; Arduino UNO (using voltage converter); Arduino YÚN (using voltage converter); ESP32 (LOLIN32 WEMOS); STM32; Mega 2560 (using voltage converter); Genuino Micro/Atmega32u4 (using voltage converter) and Arduino DUE.

{% include repository.html %}

1. License Copyright
2. Thanks
3. Your support is important
4. About the SI4735
5. Terminology
6. Labrary Features
7. Library Installation
8. API Documentation
   • About Class, Methods(functions) and custom data type structures
   • PU2CLR SI4735 Arduino Library methods (functions)
   • RDS support
   • SSB support
9. Hardware Requirements and Setup

• Schematic
• Component Parts
• Tips to build

10. Most Frequent Problems
11. Boards where this library has been successfully tested

• Photos (Tools and Accessories)

12. References
13. Examples
14. Third Party Projects
15. Videos
    • Project examples made by the author
    • Third-party projects using this library
16. Commercial Receivers based on Si47XX Family

Copyright (c) 2019 Ricardo Lima Caratti

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE ARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

• I would like to thank Mr Francisco Scaramella for the suggestions and contributions provided in the electronics field as well as for the testing of the functions implemented in this library;
• I would like to thank Mr Vadim Afonkin for making available the SSBRX patches for SI4735-D60 on his Dropbox repository;
• David Kellmer (USA) for suggesting corrections on the documentation and sketches;
• WH2Q, Morikaku Gotoh, for his suggestion about Automatic Volume Control on AM mode;
• All members of the Facebook groups "Si47XX for radio experimenters" and "Si47XX para radioescutas" for the suggestions and corrections during the development of this project.

If you would like to support this library development, consider joining this project via Github. Alternatively, make suggestions on features you would like available in this library. Thank you!

The Si4735 is DSP radio receiver IC from Silcon Labs. It has great performance on AM (LW/MW/SW) and local FM station. The SI4735 can be programmed by using commands and responses. You can contron it via a microcontroller like Arduino. To make the SI4735 perform an action, the microccontroller have to send a set of bytes (command and arguments) that the device interpret it and executes the given command.

The image below shows the SI473X-D60 block diagram. It was extracted from Silicon Labs Si4730/31/34/35-D60 / BROADCAST AM/FM/SW/LW RADIO RECEIVER (page 21). Note that the author of this Library highlights in red the pin operating voltages that can be connected to the Arduino. Be aware of the operating voltage of the Arduino pins you will use in your project. Preferably use an Arduino with 3.3V operating voltage. If you are not using a 3.3V version of Arduino, you must use a kind of 5V to 3.3V converter on RST, SCLK, SDIO and SEN (depending on your project).

• FM (VHF) support (64–108 MHz)
• AM (MW) band support (520–1710 kHz)
• SW band support (2.3–26.1 MHz)
• LW band support (153–279 kHz)
• Allows firmware upgrade. Including the possibility of adjustments to demodulate SSB.
• Advanced AM/FM seek tuning
• Automatic frequency control (AFC)
• Automatic gain control (AGC)
• Digital FM stereo decoder
• AM/FM/SW/LW digital tuning
• RDS/RBDS processor
• Digital audio out
• I²C and SPI interface
• Great Programming Guide and additional documentation to deal with the device

This library uses the I²C communication protocol and implements most of the functions offered by Si47XX (BROADCAST AM / FM / SW / LW RADIO RECEIVER) IC family from Silicon Labs. The main features of this library are listed below.

1. Open Source. It is free. You can use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software. See MIT License to know more.
2. Built Based on Si47XX PROGRAMMING GUIDE
3. C++ Language and Object-oriented programming. You can easily extend the SI4735 class by adding more functionalities;
4. Available on Arduino IDE (Manage Libraries);
5. Cross-platform. You can compile and run this library on most of board available on Arduino IDE (Examples: ATtiny85, boards based on ATmega328 and ATmega-32u4, ATmega2560, 32 ARM Cortex, Arduino DUE, ESP32 and more). See Boards where this library has been successfully tested;
6. Simplifies projects based on SI4735;
7. I²C communication and Automatic I²C bus address detection;
8. More than 120 functions implemented. You can customize almost every feature available on Si47XX family.
9. RDS support
10. SSB (Single Side Band) patch support

You can install this library on your Arduino environment using different methods. The best ways to do that are described below.

This is the easiest method to install this library.

{% include libinstalling.html %}

First, you have to download this library in zip format. Click here to download the Arduino Library. Click here to go to github repository.

You might need some old version (release) of this library. If so, check this link.

Unzip the SI4735.zip file in your Arduino Library folder.

• On Windows: "My Documents\Arduino\libraries"
• On MAC OS: ˜/Documents/Arduino/libraries
• On Linux: ˜/Documents/Arduino/libraries

See more

This library has tow documentation sources:

• SI4735 Arduino Library documentation generated by Doxygen (updated)
• Legacy documentation (not updated frequently)

Doxygen is a tools that can generate documentation from source code. This tools help the development team to keep the documentation updated.

If you prefer, you can also read the documentation directly from the SI4735.cpp and SI4735.h. These files are also well documented.

The Si47XX family works with many internal data that can be represented by data structure or defined data type in C/C++. These C/C++ resources have been used widely here. This aproach made the library easier to build and maintain. Each data structure created here has its reference (name of the document and page on which it was based). In other words, to make the SI47XX device easier to deal, some defined data types were created to handle byte and bits to process commands, properties and responses.

All data types defined in Si4735 Arduino Library are explained here

This library was developed using the C++ language and the Object-oriented Programming approach. Methods are functions that belongs to the class, in this case SI4735 class. Click here to go to API docummentation.

All methods defined in Si4735 class are explained here. The list below refer to the method groups implemented by the Si4735 class.

Methods of this group are useful to configure the way that the Si47XX devices have to be initiate.

Allows to query the part number, chip revision, firmware revision, patch revision and component revision numbers.

The Si4735 class has a set of methods to query the current frequency, RSSI, SNR, multipath, and the antenna tuning capacitance value (0-191).

Methods to query AGC status. Returns whether the AGC is enabled or disabled and it returns the gain index.

The SI4735 class has a set of methods to setup filters on AM and SSB mode.

Methods to setup the audio mode (Digital or Analog), volume, mute etc.

This library implements some RDS features of the SI4735. All function to deal with RDS are documented here. Below you have some videos showing the RDS functionalities implemented by the PU2CLR Si4735 Arduino Library.

{% include videoRDS2.html %}

{% include videoRDS1.html %}

See RDS example implementations here.

The table below shows the features that this library implements.

• [ˆ3] The basic information includes the Program Service Name and it has 8 characters. It should identifie just the name of the station. However, some stations might use this resource to show other kind of messages, contradicting what is established by the RDS protocol.

The SI4735 class implements a set of methods to apply patches and deal with SSB mode. All documentation about pathces can be seen here.

First of all, it is important to say that the SSB patch content is not part of this library. The paches used here were made available by Mr. Vadim Afonkin on his Dropbox repository. It is important to note that the author of this library does not encourage anyone to use the SSB patches content for commercial purposes. In other words, this library only supports SSB patches, the patches themselves are not part of this library.

In this context, a patch is a piece of software used to change the behavior of the SI4735 device.

There is little information available about patching the SI4735. The following information is the understanding of the author of this project and it is not necessarily correct.

A patch is executed internally (run by internal MCU) of the device. Usually, patches are used to fixes bugs or add improvements and new features of the firmware installed in the internal ROM of the device. Patches to the SI4735 are distributed in binary form and have to be transferred to the internal RAM of the device by the host MCU (in this case Arduino boards). Since the RAM is volatile memory, the patch stored into the device gets lost when you turn off the system. Consequently, the content of the patch has to be transferred again to the device each time after turn on the system or reset the device.

I would like to thank Mr Vadim Afonkin for making available the SSBRX patches for SI4735-D60 on his Dropbox repository. On this repository you have two files, amrx_6_0_1_ssbrx_patch_full_0x9D29.csg and amrx_6_0_1_ssbrx_patch_init_0xA902.csg. It is important to know that the patch content of the original files is constant hexadecimal representation used by the language C/C++. Actally, the original files are in ASCII format (not in binary format). If you are not using C/C++ or if you want to load the files directly to the SI4735, you must convert the values to numeric value of the hexadecimal constants.

ATTENTION: The author of this project does not guarantee that procedures shown here will work in your development environment. Given this, it is at your own risk to continue with the procedures suggested here. This library works with the I²C communication protocol and it is designed to apply a SSB extension PATCH to CI SI4735-D60. Once again, the author disclaims any liability for any damage this procedure may cause to your SI4735 or other devices that you are using.

All methods/functions to deal with SSB on Si4735-D60 can be seen here.

{% include videoSSB.html %}

See SSB example implementations here.

This library has been written for the Arduino platform and has been successfully tested on many platform. See Boards where this library has been successfully tested

• THE SI4735 IS A 3.3V PART. IF YOU ARE NOT USING A 3.3V VERSION OF ARDUINO or anothe board, YOU HAVE TO USE A KIND OF 5V-3.3V BIDIRECTIONAL CONVERTER. Also pay attention to the appropriated pinout of your board to select the correct interrupt (IRQ- if you are using), RST, SDIO and SCLK pins. The table below shows some Arduino board pinout.

The main porpuse of this prototype is testing de Si4735 Arduino Library. It does not intend to be a real radio for exigent listener. However, it is possible to start with it and after include some devices to improve, for example, its sensibility beyond other desired features.

The image bellow shows a version of Slicon Labs SSOP Typical Application Schematic connect to the host MCU (Arduino Pro Pini 3.3V). Pay attention to the Si4735-D60 SEN pin (16). When the SEN pin is connected to the ground, the I²C bus address is 0x11. When the SEN pin is connected to +3.3V, the I²C bus address is 0x63. By default, the "Si4735 Arduino Library" uses the 0x11 I²C bus address (SEN pin connected to GND). If you want to use the address 0x63 (SEN connected on +3.3V), see the functions (methods) getDeviceI2CAddress, setDeviceI2CAddress and setDeviceOtherI2CAddress.

• See some Shortwave antenna configuration on Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES; AN383

• THE SI4735 IS A 3.3V PART. IF YOU ARE NOT USING A 3.3V VERSION OF ARDUINO, YOU HAVE TO USE A KIND OF 5V TO 3.3V CONVERTER. Also pay attention to the appropriated Arduino pinout to select the correct interrupt (IRQ), RST, SDIO and SCLK pins. The table below shows some Arduino board pinout.

• The Si473X SEN pin (16 on SSOP version and 6 on QFN version) when connected to the ground, the I²C bus address is 0x11. When this pin is connected to +3.3V, the I²C bus address is 0x63. See the functions getDeviceI2CAddress and setDeviceI2CAddress to correct setup. If you follow the schematic used in this project, you do not need to do anything (the default I²C bus address is 0x11). If you do not know how this pin is configured on the board, use getDeviceI2CAddress.

The table below shows the component parts used to build the radio prototype based on Si4735 and used the Slicon Labs SSOP Typical Application Schematic as main source. However, some parts were included by the author of this project.

• *1: C7 and C8 are ceramic capacitors included by the author of this project. They are not present on original Silicon Labs schematic. Actually, you can use also electrolytic capacitors. Values between 2.2uF to 10uF will work well.
• *2: R4 and R5 are pull-up resistor included by the author of this project. They are not present on original Silicon Labs schematic. This will also depend on other devices connected to the same I²C bus. Always try to use the lowest possible value.

Notes from Silicon Labs Broadcast AM/FM/SW/LW Radio Receiver documentation (page 12):

• Place C1 close to VA and C4 close to VD pin.
• All grounds connect directly to GND plane on PCB.
• Pins 6 and 7 are no connects, leave floating.
• Pins 10 and 11 are unused. Tie these pins to GND.
• To ensure proper operation and receiver performance, follow the guidelines in “AN383: Si47xx Antenna, Schematic,
• Layout, and Design Guidelines.” Silicon Laboratories will evaluate schematics and layouts for qualified customers.
• Pin 8 connects to the FM antenna interface, and pin 12 connects to the AM antenna interface.
• Place Si473x-D60 as close as possible to antenna and keep the FMI and AMI traces as short as possible.

• Try to follow what the Silicon Labs recommends;
• Start building the minimum circuit and test it;
• Check if the Si47XX RESET pin (15 on SSOP version or 5 on QFN version) is connected on your MCU (Arduino) pin defined as RESET the (the most of schematics and examples of this project this pin is the digital pin 12);
• Use the minimum sketch to test the minimum circuit. The first three examples of this project (see examples folder) can be used to test the minimum circuit;
• Try not improvising the I²C bus connection. Start using a 3.3V MCU (Arduino Pro Mini 8MHz or DUE, ESP32 or other 3.3V device) to connect with SI4735;
• If you are using the Arduino Pro Mini 3.3V board, select the correct Processor on Arduino IDE (ATmega328, 3.3V, 8MHz);
• Some devices provide internal pull-up resistors that in some cases can be enabled or disabled. Also, the capacitance of the I²C bus is another variable that have be considered to select the right resistor values. However, that capacitance is not easy to be measured. For these reasons, it can be a liitle dificult calculate the right resitor values at first. That said, start with a high pullup resistor to I²C bus and then reduce it until the best value. For example: start with 10K and try to reduce the value to 4,7K, 3,3K, 2.2K etc. Select the lowest resistor you can.
• I²C bus devices are available in different speeds. If you are using an I²C display device, check if its speed is compatible with the Si47XX and also with the current speed used by the master MCU;
• Using different voltage levels between I²C devices can be unsafe and can destroy parts connected on I²C bus, specially the Si47XX;
• It is important to wire all your I²C devices on the same common ground.
• If you are using Arduino Mini Pro, UNO or similar, pay attention to the pin 13 and the use of internal pull-up resistor. This pin has a LED and a resistor connected on the board. When this pin is set to HIGH, the LED comes on. If you use the internal pull-up resistor of the pin 13, you might experiment problem due to the drop voltage caused by the LED circuit. If this occurs in your project, you can do:
  • Use the pin 14. This pin is the A0 (Analog). But you have to refer it by 14 to use it as digital pin;
  • Change the circuit and sketch to use external pull-up on pin 13;
  • Remove the LED or resitor connected to the led from the board.
• Use only batteries to power your circuit. Receptions in LW, MW and SW can be seriously harmed by the use of power supplies connected to the grid.
• See some Shortwave antenna configuration on Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES; AN383

If you are using Arduino Mini Pro, UNO or similar, pay attention to the pin 13 and the use of internal pull-up resistor. This pin has a LED and a resistor connected on the board. When this pin is set to HIGH, the LED comes on. If you use the internal pull-up resistor of the pin 13, you might experiment problem due to the drop voltage caused by the LED circuit. If this occurs in your project, you can do:

• Use the pin 14 instead. This pin is the A0 (Analog). But you have to refer it by 14 to use it as digital pin;
• Change the circuit and sketch to use external pull-up on pin 13;
• Remove the LED or resitor connected to the led from the Arduino Board.

This problem can be a little complicated to solve. I have observed that very few times in my experiments. When I am powering the system using the computer USB and the computer is connected to the grid, it might occur. Please, test your system using only batteries.

This problem also can be caused by the external crystal. This crystal needs a minimum delay to become stable after a reset or power up command. Currently, this delay is 10ms. Try to increase that delay by using the method setMaxDelayPowerUp.

Example:

 si4735.setMaxDelayPowerUp(500);

Also, for some reason, the frequency switching needs a little delay (the default value is 30ms). Try to increase that delay by using the method setMaxDelaySetFrequency.

Example:

si4735.setMaxDelaySetFrequency(50);

• Please, use only batteries to power your system up on LW, MW or SW.
• Check your circuit on AMI pin of the Si47XX device.
• Keep as far as possible from noise sources (LED light bulb, computers and any device connected to the power grid)
• Try to find a suitable size for the antenna wire. Too long can be a big noise pickup. If too short, it may not be enough to pick up radio stations.

Some users may be uncomfortable with the loud popping of the speaker during some transitions caused by some Si47XX device commands. This problem occurs during the receiver transition from the power down to power up. Also, every time the user changes the mode (FM to AM or AM to FM) the power down and power up sequence is required by the Si47XX devices. So far, the author of this library have not found an internal solution to solve the loud popping of the speaker. It is important to say that internal SI47XX mute or volume commands do not work. However, it is possible to solve this problem by adding an extra mute circuit and control it by the controller (Atmega, ESP32, STM32, ATtiny85 etc).

The schematic below shows this approach.

When the D14 is HIGH the Si47XX output audio will be drained to the ground. At this condition, no audio will be transferred to the amplifier input and, consequently, to the speaker. So, no loud click in the speaker.

When the D14 is LOW, the most of signal audio output from the Si47XX will be transfered to the amplifier input.

The code below shows all you have to do in your sketch to implement this resource.

#include <SI4735.h>
#define AUDIO_MUTE 14      // Pin A0 - Switch AGC ON/OF

Si4735 r;

void setup() {
  .
  
  // It is all you have to do to control a external audio mute circuit if you have one. 
  r.setAudioMuteMcuPin(AUDIO_MUTE); // Tells the system to control an external audio mute circuit. 

  r.setup(RESET_PIN, -1, 1, SI473X_ANALOG_AUDIO); // Starts on FM mode and ANALOG audio mode. 
  .
  .
  .

} 

{% include audiomute.html %}

This library can be useful to develop a cross-platform software. So far, it has been successfully tested on the architectures shown below.

The table below shows the some boards where this library has been successfully tested.

• [ˆ4] It seams that in some ESP32 board, the I²C bus is not configured prorpelly by default. However, you can set almost any pin on ESP32 to setup I²C capabilities. All you have to do is call Wire.begin(SDA, SCL); where SDA and SCL are the ESP32 GPIO pins. The code below shows that.
• [^5] You can use the pin 12 too.

1. More about ESP boards on ESPRESSOF Development Boards.
2. More about BlueDuino on Seed.
3. On Arduino.cc you can see the technical specification about many board.

{% include videocross.html %}

This item describes some tools and accessories you might need to build your radio based on SI4735. Most of the accessories used in this project you will find on eBay and AliExpress.

Arduino Pro Mini	Arduino Pro Mini

• Pro Mini 3.3V 8MHz /5V 16M Atmega328 Replace ATmega128 Arduino Compatible Nano

FT232 USB Adapter	FT232 USB Adapter

• FT232RL 3.3V 5.5V FTDI USB to TTL Serial Adapter Module for Arduino Mini Port

Magnifier	Solder

• 50-1000X Magnifier Wireless WiFi Electric Microscope 2.0MP 8LED Endoscope Camera
• Soldering Iron Station with Temperature Control

Adapter for SI4735	Soldering Accessories

• SO SOP SOIC SSOP TSSOP 24 Pin to DIP 24 Adapter PCB Board Converter
• 50g Soldering Paste Solder Flux Paste Cream for PCB PGA SMD BGA
• BGA SMD Soldering Paste Flux

It was a bit hard to solder the kind of CI on adapter. However, by using a electronic magnifier it was possible.

Si4735 on Adapter	Si4735 on Adapter

The basic circuit built on protoboard is based on the “SSOP Typical Application Schematic”, suggested by the Silicon Labs Documentation (Si4730/31/34/35-D60-BROADCAST AM/FM/SW/LW RADIO RECEIVER; page 19). Two pull-up 4.7K resistors were added on I²C bus (It is an arbitrary value. Actually, this value may vary depending on your devices connected to the bus). Also, it is recomended to add two 4.7uF capacitors between the CI audio output and audio amplifier. The photos below do not show these capacitors. See C7 and C8 on schematic.

The figure below shows a suggestion to shrink the prototype and connections. If you are just doing prototyping, I recommend this approach due to the short connections with the Si4735 (recommended by the manufacturer).

The configuration above connected to Arduino Pro Mini is shown below.

The following photo shows the most common prototyping approach. Use this approach if you don't want to solder the components on the adapter plate.

The figure above shows the very basic shematic implementation (no Button or Encoder). See the folder examples for more details and other configuration with LCD and OLED

1. Silicon Labs Si4737 WB/AM/FM Stereo/RDS single-chip receiver HAL library for Arduino
2. BROADCAST AM/FM/SW/LW RADIO RECEIVER
3. SI47XX PROGRAMMING GUIDE
4. AN332 REV 0.8 UNIVERSAL PROGRAMMING GUIDE AMENDMENT FOR SI4735-D60 SSB AND NBFM PATCHES
5. Installing Additional Arduino Libraries
6. Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the frequency range from 87,5 to 108,0 MHz
7. Radio Data System
8. RDS Encoder
9. RDS in Europe, RBDS in the USA –What are the differences and how canreceivers cope with both systems?
10. RBDS & RDS PTY Codes and Program Types
11. Using RDS/RBDS with the Si4701/03
12. Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES; AN383
13. Other implementations using Si4735 and Arduino
    • This is a git fork of [Michael Kennedy's]
    • Arduino Si4735 radio library
    • SI4735 AM & FM Receiver Shield
    • Si4735 Digital AM/FM Radio Receiver
    • Ryan Owens for SparkFun Electronics
    • Silicon Labs Si4737 WB/AM/FM Stereo/RDS single-chip receiver HAL library for Arduino
    • Enhanced Software for Elektor DSP-Radio (Si4735)
14. I²C
    • Taking The Leap Off Board: An Introduction To I²C Over Long Wires
    • Difference between I²C and SPI
    • Issues with the I²C (Inter-IC) Bus and How to Solve Them
    • I²C Manual; Application Note; AN10216-01
    • IMPROVING NOISE IMMUNITY FOR SERIAL INTERFACE; A Lattice Semiconductor White Paper; July 2014
    • Bus Buffers Simplify Design of Large, Noisy I²C Systems
    • Common Problems In Systems
15. Forums
    • How to reduce I²C bus noise
    • Radio interferes with I²C bus communication
    • Reducing Noise on an I²C bus line
    • Noise on I²C bus
    • Noises on the I²C BUS
16. "Multi-Band Receiver On A Chip Controlled By Arduino" commented by Tom Nardi on Hackaday

Here you can see some experiments using this library. Watch them.

{% include video01.html %}

• Si4735 All in One Receiver running on Arduino Pro Mini 3.3V (8MHz) and TFT Display
• Si4735 All in One Receiver with TFT Touch Screen
• Si4735 Arduino Library example. OLED Application.
• SI4735 Arduino Library and a simple FM and AM radio implementation
• SI4735 ARDUINO LIBRARY BANDWIDTH TEST
• Si4735 Arduino Library and SSB Support (Listening to a QSO on 20 meters)
• Evaluating SSB audio from the SI4735-based radio prototype
• How to "SI4735 Arduino Library and ATtiny85"
• SI4735 Arduino Library working with ATtiny85
• NE928-10A V:01 board working with "Si4735 Arduino Library"
• Si4735 Arduino Library and Blepill STM32F103

• SI4735 SSB
• All Band Radio with a Nice Interface
• SI4735 11 ALL IN ONE TEST OLED ver from jg3pup
• New HF SSB receiver made of Si4735 is done!
• SSB DSP radio (Si4735) version 5 revision 2
• Si4735 LCD版でSSBを受信
• Wefax576 via SI4735 with audio cable fldigi
• SI4735 Radio KIT prototype
• SI4735 KIT. First LF test
• SI4735 KIT. First SSB test
• SI4735 KIT - First FM test
• Great interface by Gert Baak

The table below shows some radios based on SI47XX

SI47XX For Radio Listeners Grupo Público · 36 membros Participar do grupo Intended for hobbyists, experimenters, hams and radio enthusiasts who use SIlicon Labs SI47XX based radios. The purpose of this group is to present an...