This is an alternative firmware for wireless 433MHz magnetic door/window reed sensors.
STC15W101/104 are 8051 based processors + SYN115 radio transmitter.
'101 model has 1KB flash.
'104 model has 4KB flash and circuit board also has a tamper detect switch.
Instead of supporting software serial or full hardware abstraction layer (HAL),
it is decided to keep firmware under 1KB so it works on multiple processors/boards.
One possibility however is to use emulated EEPROM area for code space.
Experiments with booting from other memory spaces have not worked so far:
mightymos/stc15bootisp#1
Finally, STC processors do not allow read/verify of written firmware.
Therefore an open source alternative is needed to confirm program behavior.
Also for this reason original firmware can not be reflashed once overwritten.
Boards contain a header that may be populated with pins labeled with G (ground), T (transmit), and R (receive) for flashing with USB to UART module.
| Proposed | original or added | status |
|---|---|---|
| Transmit on reed switch open/close (interrupt) | original | DONE |
| Transmit on tamper switch open/close (interrupt) | original | DONE |
| Manage power modes | original | DONE |
| Support inverted protocols | added | DONE |
| Ability to specify timings for transmission protocol (e.g. rc-switch) | added | DONE |
| "Heart beat" mode for periodic transmission | added | DONE |
| Add tamper closed key | added | DONE |
| Add tamper "trip" mode | added | DONE |
| Send code if pin goes low indicating low battery | original | DONE |
| Store settings in EEPROM | added | todo |
| Send information over radio (e.g., settings?, battery?) | added | todo |
| Compare power usage to original firmware | added | todo |
| Test other transmission protocols | added | todo |
| Adjustable LED blink behavior | added | todo |
| Adjustable sleep behavior | added | todo |
| User configuration/input with tamper switch press(es) | added | todo |
# install https://sdcc.sourceforge.net/ for your platform
cd ~/
# flashing tool
git clone https://github.com/area-8051/stcgal-patched.git
# hardware abstraction layer for stc
git clone https://github.com/area-8051/uni-STC.git
cd uni-STC/demos/
# this repository
git clone https://github.com/mightymos/ReedTripRadio.git
cd ReedTripRadio/
make
# make file should be used to flash in the future
# (port format specific to Windows, change for other systems)
~/stcgal-patched/stcgal.py -p COM3 -b 19200 build/ReedTripRadio.ihx
Receiving radio packets requires a receiver. Options include the Sonoff RF Bridge 433 MHz and recommend flashing with open source firmware Tasmota or ESPurna. ESPurna is nice because it treats wireless sensors as "virtual" sensors (show up as permanent switch entities in Home Assistant). Also ESPurna can learn/remember unique sensor codes.
Some Sonoff Bridge(s) contain an onboard EFM8BB1 which can additionally be flashed to support more radio protocols with Portisch. I originally thought this would be helpful but apparently most rc-switch protocols are not supported.
You can also use a generic 433 MHz receiver and controller using rc-switch library.
| Source | Link | Price (USD) |
|---|---|---|
| aliexpress | https://www.aliexpress.us/item/3256803337417240.html?spm=a2g0o.order_list.order_list_main.23.7cf8180213pdH3&gatewayAdapt=glo2usa&_randl_shipto=US | $4.09 (12/05/2022) |
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent