KG3RK3N
commented
5 months ago Hi @kipwittchen
Here is a sample for sending data from a arduino to a esphome device with uart:
static unsigned long _ETimer;
unsigned long t = 1000;
void setup() {
Serial.begin(115200); // debugging output
Serial1.begin(115200); // Serial1
}
void loop() {
if ( millis() - _ETimer >= (t)) {
_ETimer += (t);
static unsigned int i;
i++;
sendMySensorValue(); // here start sending my sensor value
}
}
// sample to send sensor value
void sendMySensorValue() {
uint8_t address = 0x05; // <- thats the address from the esphome sensor
float sensorValue = 42.5;
uint8_t sensorType = 0; // 0 = number, 1 = binary, 2 = text
sendUartData(address, &sensorValue, sizeof(sensorValue), sensorType);
}
// start of the code to generate & send uart message
static const int headerSize = 3;
void sendUartData(uint8_t address, const void *data, size_t dataLength, uint8_t sensorType) {
uint8_t uartData[headerSize + dataLength];
uartData[0] = address;
uartData[1] = sensorType;
uartData[2] = dataLength;
memcpy(uartData + headerSize, data, dataLength);
uint8_t checksum = calculateChecksum(uartData, headerSize + dataLength);
uartData[headerSize + dataLength] = checksum;
Serial1.write(uartData, headerSize + dataLength + sizeof(uint8_t));
}
uint8_t calculateChecksum(const uint8_t *data, size_t length) {
uint8_t checksum = 0;
for (size_t i = 0; i < length; i++) {
checksum ^= data[i];
}
return checksum;
}The timer stuff in the loop is not necessary, you can use delay or something else. I only added that to prevent flooding the uart bus.
On your esphome device, you need to configure the "uart_p2p_receiver" component like this:
uart_p2p_receiver:
uart_id: uart_1
sensors:
- id: my_sensor_1
name: "My Sensor 1"
address: 0x05I haven't tested this example. But if it works, it would be nice to get some feedback from you so I can add it to the docs/wiki as an sample use case.
kipwittchen
Hello! I just stumbled across your repo and I think I'll be able to use it to communicate with a non-esphome esp device I'm going to have.
My use case is this, I have an esp32 which will be communicating with a proprietary device via a standalone wifi network. I then need to take that numeric sensor data (I'll have a couple sensors, all numeric) and want to pass them eventually into home assistant. If I use serial1 to TX/RX pins on that non-esphome device to an esphome device running your library with the two connected via those pins, I think I'll be all set.
My question is, how do I transmit the data via serial from a device that's just running arduino code? I think it's as simple as doing a Serial1.write() in the correct format. On the non-esphome device I'd just open the serial connection with:
TX_1 = #; //# is pin #RX_1 = #; //# is pin #Serial1.begin(115200, SERIAL_8N1,RX_1,TX_2);Thank you for any assistance you can provide!