alexrus / marax_timer Goto Github PK

Hi!
I'm wondering how the serial communication is supposed to work since there doesn't seem to be any GND connection between the MCU and the coffee machine?
Looking at code and documentation, only the RX and TX lines seem to be connected - no GND.

I'd like to understand how this is supposed to work before trying to build it.

Best regards!

Hi 👋

In order to stop the timer we have to wait for (at least) a period of the pump (because of the reed sensor pulsing).
You calculated this to be 500ms.

But, since we waited 500ms from our 1st 0 read, I think those 500ms need to be subtracted from the timer afterwards.
Or, am I missing something ?

For example, instead of stoping the timer at millis:
timerDisplayOffMillis = millis();

You should stop it at:
timerDisplayOffMillis = millis() - 500;

or better (?) take the millis we had the 1st 0 as the actual stop time?
timerDisplayOffMillis = timerStopMillis;

I got this message when i copied the code provided and uploaded onto my Arduino board. Any help?

C:\Users\Admin\AppData\Local\Temp.arduinoIDE-unsaved2023115-20396-10iotpg.0ay2\sketch_dec5c\sketch_dec5c.ino:7:10: fatal error: Adafruit_SSD1306.h: No such file or directory
7 | #include <Adafruit_SSD1306.h>
| ^~~~~~~~~~~~~~~~~~~~
compilation terminated.

exit status 1

Compilation error: Adafruit_SSD1306.h: No such file or directory

trying to see if I can transfer to a gaggia pro. problem is that a machine on signal must be sent to d5 d6 before the display is activated, is there a way to remove that check

How do i change the code to make the text for a SH1306?

After i’ve 3D printed the case as per the link that i realized the 0.96” OLED won’t fit as the case is way to big for it. Instead of going for another 3D print i reckon it will be easier for me to get a SH1306 instead

Hi all,

thanks for this, this is looking great!
Currently I am planning to either purchase the MaraX or MaraT. The only difference I've spotted on the MaraT is that this has a PID installed. But does anyone know if the MaraT has also the 6 PIN Serial connector? Would be great to also get those readings.

Thanks!

Hi. I followed your instructions to create a shot timer. It works create, but the temperature section shows a lot ot different letters and doesn't show the correct temperature. Sometimes it works. Mostley not. Do you have am idea whats wrong?

Hey thanks for posting this. Everything worked fine until I connected pins 3 and 4 to the board. if i have it set up without them everything works great, the timer goes on and off perfectly. but when I connect pins 3 and 4 to D5 and D6 (or the other way around) this causes the machine to reverse the pump flow, so water comes out when the lever is lowered, and stops coming out when the lever is down. Any ideas why? Thanks!
edit: its the OPV discharge that water is coming out of not the water head.

I just set up the board and installed the reed sensor as described in the README.

After starting the Mara X machine and the board, the timer immediately starts counting, although the pump has not started yet. When starting or stopping the pump, the timer keeps counting and doesn't stop.

Any ideas on what causes the problem and how to fix it?

It would be great if the README can be extended with detailed hardware information.
Currently, the list contains the following information:

Hardware:

• NodeMCU (ESP8266)
• 0.96" oled display
• reed sensor
• wires
• 3d printed case (https://www.thingiverse.com/thing:2937731)

These questions remain open:

1. Are there any preferred NodeMCU ESP8266 boards? Like CH340G, CP2102, CH9102X, ...
2. The linked 3D case is made for an SH1306 OLED display. Which is the correct one: the original, big one on the blue-colored board or the new smaller one on the black/dark-grey board?
3. Which reed sensor type is the correct one: open or closed?

Came back to this code, and realised the new version is significantly streamlined with no WiFi / MQTT support. Wonder if I am missing anything out?

The timer is working super well and I can see the temp sometimes, but it is rotates between the temp and garbage Unicode characters.

Attached is a video of what I mean.

Not sure if this is a bad crimp or a software issue.