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////////////////////////////////////////////////////////////////////////////////////
// Digital Photoreactor Controller Slave Program Controlled by I2C //
// Run this slave program on the Arduino Uno or Rasberry Pi. //
////////////////////////////////////////////////////////////////////////////////////
#include <Wire.h>
#define I2C_SLAVE_ADDR 0x26 // I2C slave address (38, 0x26)
void setup()
{
// init the Wire object
Wire.begin();
// wait for slave to finish any init sequence
delay(2000);
}
void loop()
{
//generate buffer containing data to send via I2C
uint8_t buf[1];
buf[0] = 25; // adjusting this byte changes fan speed. Can be adjusted from 0 to 256.
buf[1] = 1; // adjusting this byte changes LED intensity. Can be adjusted from 0 to 256.
// send buffer
Wire.beginTransmission(I2C_SLAVE_ADDR);
Wire.write( buf, 2);
Wire.endTransmission();
// delay 20 milliseconds to accomodate slave onReceive()
delay(20);
/////////////////////// WHY DO I NEED THIS PART?//////////////////////////
Wire.requestFrom(I2C_SLAVE_ADDR, 1);
// delay 1 second so user can watch results
delay(1000);
}
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