I recently made my first node for the TTN network using this guide: How to build your first TTN node: Arduino + RN2483 and the sample code from https://github.com/jpmeijers/RN2483-Arduino-Library . After sending some “Hello world” messages around, and seeing them come in in the dashboard, I connecte…

a 16bit integer is 2 bytes and a 2 byte array is 16bits. Ie you don’t need to create the 2 byte array. Just send the 16bit int.

You might also want to have a look at https://github.com/thesolarnomad/lora-serialization (as mentioned before in Approaches for efficient payload encoding ). It should take care of any endiannes issues .

var msg2 = { payload: msg.payload.length }; msg2.payload = JSON.parse(msg.payload); msg2.payload = new Buffer(msg2.payload.payload, ‘base64’).toString(‘hex’); var lat = Buffer(msg2.payload, ‘hex’).readFloatLE(0); var lon = Buffer(msg2.payload, ‘hex’).readFloatLE(4); msg2.payload= “[{“lat”:” + l…

@erikHouten On staging.thethingsnetwork.org/applications I use this function: function(bytes) { var Bytes2Float32 = { decodeFloat: function(bytes, signBits, exponentBits, fractionBits, eMin, eMax, littleEndian) { var totalBits = (signBits + exponentBits + fractionBits); …

Hi, Can someone send me a code for HX711 loadcell amplifier and DHT22 library? I have tried this: uint16_t weight = scale.get_units() * 100; // Read sensor values and multiply by 100 to effictively have 2 decimals uint16_t humidity = dht.readHumidity(false) * 100; // false: Celsius (default) /…

You’re multiplying by 100, and storing that in memory as an “unsigned 16 bits integer” (uint16), hence losing all remaining decimals. For example: 12.34567 is stored and sent as 1234, which is probably just fine as most sensors really don’t have an accuracy of 4 decimals (or even 2 decimals). It eve…

Hi ! I have some difficult with the payload function. Here is my Payload: 32352E3736302E32 This is for a DHT22 sensor. When i use python I can read values: >>> binascii.unhexlify('32352E37') b'25.7' >>> binascii.unhexlify('36302E32') b'60.2' But I can’t make readable on the decoder. What can I …

[image] Jonathanmf: binascii.unhexlify(‘32352E37’) b’25.7’ That’s decoding text (where the hexadecimal 0x32 is the character 2, 0x35 is 5, 0x2E is the dot, and 0x37 is 7). But your node should not send text as that needs 8 bytes for just two values with a very limited range. Still then, whi…

Oh I understand, so I need to optimise the code. I’m totally “noob” I need to learn. Thanks for your explanation. BTW, here is the code :slight_smile: void onEvent (ev_t ev) { Serial.print(os_getTime()); Serial.print(": "); switch(ev) { case EV_SCAN_TIMEOUT: Serial.…

[image] Jonathanmf: byte buffer[8]; float t = dht.readTemperature(); float h = dht.readHumidity(); dtostrf(t, 2, 1, buffer); dtostrf(h, 2, 1, &buffer[4]); This goes horribly wrong for any value that does not convert to exactly four characters. (If you found that code elsewhere, please refer t…

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