Multiple i2c writes on request

Projects Networking, Protocols, and Devices
2

On the slave side, you need to place all the bytes to be sent in one buffer before sending it with Wire.write().

One way to do it is with a struct. Your receive sketch will work with this.

#include <Wire.h>

struct
{
  float Voltage1;
  float Voltage2;
  float Voltage3;
  float Current;
}
floatsToSend;

void requestEvent ()
{
  floatsToSend.Voltage1 = 12.52;
  floatsToSend.Voltage2 = 25.54;
  floatsToSend.Voltage3 = 23.29;
  floatsToSend.Current = 511.20;

  Wire.write((byte*)&floatsToSend, sizeof(floatsToSend));
}


void setup() {
  Wire.begin(8);
  Wire.onRequest(requestEvent);
}

void loop() {}