Particulate Matter Sensor Breakout (for PMS5003) incorrectly labelled?

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Hi all,

Trying to get my PMS5003 sensor working using Arduino Uno R4 Wifi connected to D0/D1.

I read on this forum here that the TX/RX are incorrectly labelled on the PM Breakout by Pimoroni, where as typically TX connects to RX, on this little breakout the label meant TX-TX and RX-RX How to connect PMS5003 breakout board w/ Arduino UNO? - #16 by KevinMullen

Is this true? I’m dealing with 5V to 3.3V logic conversion and wondering if I just fried my sensor.

chris project
chris project647×828 99.4 KB

Even with a basic reading of Serial1 on the R4 Wifi, I receive absolutely no data:



void setup() {
  Serial.begin(9600);     // USB serial (for debugging)
  Serial1.begin(9600);    // PMS sensor UART
  delay(3000);
  uint8_t command[] = { 0x42, 0x4D, 0xE1, 0x00, 0x00, 0x01, 0x70 };
  Serial1.write(command, sizeof(command));
 
  Serial.println("Waiting for data...");
}


void loop() {
  if (Serial1.available()) {
    byte b = Serial1.read();
    Serial.print("Byte: 0x");
    Serial.println(b, HEX);
  } 
}

Update:

Turns out, yes it is printed what may appear as backwards to some. TX on the PM Breakout in this case connects to TX/RX → RX on your Arduino (or whatever board you’re using).