Gas Sensor Programming

[Paul2808]

Hello everyone, im new here. Just wanna ask if someone work with T6615 gas sensor already?

[Paul_KD7HB]

Put your sensor id in the forum search box and search. Besides seeing your post, there is another that references the same device.

[sherzaad]

The Product documentation for the sensor seems to me to be comprehensive and fairly digestible!

in the UART communication protocol document I found, on page 8, it actually lists out the request bytes to send and how to interpret the response.

for example, to get the gas_ppm, something like this maybe:
(Compiles, Not tested!)

uint8_t req_GasPPM[5] = {0xFF, 0xFE, 0x02, 0x02, 0x03};

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(115200);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  Serial1.begin(19200); //Serial1 (MEGA) is connected to T6615 gas sensor

  Serial.print("T6615 gas sensor Example");
}

void loop() {
  uint16_t i = 0, gas_ppm = 0;

  Serial.print("Requesting GAS PPM");

  //send request to CO2 sensor
  for (int j = 0; j < 5; ++j) {
    Serial1.write(req_GasPPM[j]);
  }

  delay(1000); //arbitrary delay

  //wait for complete response to be received
  while (Serial1.available() < 5);

  while (Serial1.available()) {
    ++i;
    uint8_t b = Serial1.read();
    Serial.print(b, HEX);
    Serial.print(" ");
    if (i == 4) {
      gas_ppm = b; //MSByte received
    }
    else if (i == 5) {
      gas_ppm = (gas_ppm << 8) | b; //LSByte received
    }
  }

  if (i > 0) {
    Serial.print("Gas ppm:");
    Serial.println(gas_ppm);
  }
}

hope that helps...