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////////////////////////////////////////////////////////////////////////////////////
// Digital Photoreactor Controller Slave Program Controlled by I2C //
// Run this slave program on the AtTiny85. //
////////////////////////////////////////////////////////////////////////////////////
#include "TinyWireS.h" // wrapper class for I2C slave routines https://github.com/rambo/TinyWire/tree/master
#define I2C_SLAVE_ADDR 0x26 // I2C slave address (38, 0x26),
uint8_t master_data[1]; // global buffer to store data sent from the master.
uint8_t master_bytes; // global variable to number of bytes sent from the master.
const int LEDPin = 4; //Arduino pin 4, pin 3 on AtTiny85 pinout
const int FanPin = 1; //Arduino pin 1, pin 6 on AtTiny85 pinout
const int BlinkPin = 3; //Arduino pin 3, pin 2 on AtTiny85 pinout
void setup()
{
// initialize the TinyWireS and usiTwiSlave libraries
TinyWireS.begin(I2C_SLAVE_ADDR); // init I2C Slave mode
// register the onReceive() callback function
TinyWireS.onReceive(receiveEvent);
pinMode(LEDPin, OUTPUT); // set pin for LED PWM
pinMode(FanPin, OUTPUT); // set pin for Fan PWM
pinMode(BlinkPin, OUTPUT); // set pin to blink LED
TCCR0B = TCCR0B & 0b11111000 | 0b001; // sets internal timer of AtTiny85 to 31250 Hz for fast PWM for controlling fan speed
}
// Gets called when the ATtiny85 receives an I2C write slave request
void receiveEvent(uint8_t num_bytes)
{
uint8_t i;
// save the number of bytes sent from the master
master_bytes = num_bytes;
// store the data from the master into the data buffer
for (i = 0; i < master_bytes; i++)
master_data[i] = TinyWireS.receive();
// set LED and Fan PWM duty to random byte values recieved from the master
analogWrite(FanPin, master_data[0]);
analogWrite(LEDPin, master_data[1]);
// blink LED whenever data is successfuly recieved
digitalWrite(BlinkPin, HIGH);
delay(10);
digitalWrite(BlinkPin, LOW);
}
void loop()
{
}
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