A02YYUW UART to Wemos D1 mini
BartWeemaels 2022-05-19 06:10:22 563 Views3 Replies Hi,
I would like to connect my UART A02YYUW sensor to my Wemos D1 mini. I’m reading that I need to use softwareserial library to connect, but don’t know how to connect my A02YYUW to the wemos D1 mini board.
The 5V & GND are quit obvious, but the RX & TX seems to be hard to couple to which serial pin on the D1 mini ?
Anyone got an idea or got this working ?
Thanks in advance !
Kr,
Bart
Found the solution here (Search for A022Y on the page):
ARDUINO TUTOS – e-techno-tutos
Essentially, you need to add the following code before reading the Rx pin which sends a 30ms pulse on the Tx pin:
//send pulse
mySerial.flush();
delay(30);
digitalWrite(TXpin,HIGH);
delay(30);
digitalWrite(TXpin,LOW);
delay(30);
digitalWrite(TXpin,HIGH);
delay(60);
//read Rx PIN
Anupam.Varghese This should not be a big problem.
I took the sample code and adapted the following line.SoftwareSerial mySerial(11,10); // RX, TXGPIO 11 and 12 do not exist in Wemos
I took GPIO 12 and 13 (D6,D7).
SoftwareSerial mySerial(12,13); // RX, TX
everything else I did not change.The values are displayed correctly.
RolandSpaeni 
