Decoding uint16 sent from Arduino

Application Development
1

Hello, and sorry for a maybe very beginner question.
I’m trying to decode my readings from my temperature sensor. the Arduino code is

float temperature = sensors.getTempCByIndex(0);

int16_t temp = (temperature * 100);
Serial.println(temp);
  

modem.beginPacket();
modem.print(temp);

I can see the right payload in HEX on the ‘live data’ site, but cant seems to figure out how to decode it in the payload formatter.

function Decoder(bytes, port) {
var decoded = {};
if (port === 2)
{
decoded.temp = (bytes[1] << 8) + bytes[0];
}
return decoded;
}

This is the only example I could find of someone doing something similar, but it returns numbers with no meaning to me.

Thanks in advance

2

an example is if I’m decoding 0x32 0x33 0x35 0x30 it becomes 13106

3

Don’t send character encoded packets, that’s wasteful, send binary values or even denser encodings - uint16_t should end up at most 2 bytes, not four.

Also keep in mind that temperature can’t be an unsigned integer unless you put in a sufficient offset to make sure that it’s always positive.

If you send negative values, beware the complications of trying to re-join two’s complement byte fields in javascript(!)

1 Like
4

Thanks