Hi guys, I have my NodeMCU v3 connected a serial port (module, Raspberry pi,...) where I can read the text sent by Arduino. Here is the code: unsigned long lastCharTime = 0; #define BAUD 38400 void setup() { Serial.begin(BAUD); // for debug only Serial1.begin(BAUD); } void loop(){ i…

add GND - it's needed for both device to agree upon what 0 and 1 are (and protect your Rx pins from possible seing an over voltage)

bits flip --> you have noise on the line. Use shorter cables/shielded cables/reduce baud rate ...

I was thinking about the female jumpers I'm using may be the problem. So now I just solder male jumpers directly on it but still same problem.

[image] Common ground and why you need one General Electronics A common mistake for people new to electronics is to have 2 circuits fed from different power supplies with signals passing between the circuits, but with the grounds not connected. This leads to questions aski…

I remember reading the article provided by @PerryBebbington , which may make sens in my case but I tested then it just stop receiving message. The two devices have separated power source (ok not really, all are connected to different USB port but same PC).

[image] kamoba: The two devices have separated power source (ok not really, all are connected to different USB port but same PC). you need it. if it does not work your problem is elsewhere, but you do need Rx to Tx and GND to GND (with compatible voltage from Rx to Tx)

Yes I thing you are right, the problem was missing GND. Once I used a different power source I got the reverse, now I do not receive any message anymore without GND and when I plugged the GND I started receiving message without any weird characters. But common ground do not work if devices connec…

I am curious to see your receiver codes.

Relation between delay and baud rate for Serial

Projects Programming

PerryBebbington January 20, 2024, 8:32am 7

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Relation between delay and baud rate for Serial

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