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-rw-r--r--Digital Photoreactor Controller Firmware/Master_Photoreactor_Controller/Master_Photoreactor_Controller.ino40
-rw-r--r--Digital Photoreactor Controller Firmware/Slave_Photoreactor_Controller/Slave_Photoreactor_Controller.ino59
2 files changed, 99 insertions, 0 deletions
diff --git a/Digital Photoreactor Controller Firmware/Master_Photoreactor_Controller/Master_Photoreactor_Controller.ino b/Digital Photoreactor Controller Firmware/Master_Photoreactor_Controller/Master_Photoreactor_Controller.ino
new file mode 100644
index 0000000..8c2ffa4
--- /dev/null
+++ b/Digital Photoreactor Controller Firmware/Master_Photoreactor_Controller/Master_Photoreactor_Controller.ino
@@ -0,0 +1,40 @@
+////////////////////////////////////////////////////////////////////////////////////
+// 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);
+}
diff --git a/Digital Photoreactor Controller Firmware/Slave_Photoreactor_Controller/Slave_Photoreactor_Controller.ino b/Digital Photoreactor Controller Firmware/Slave_Photoreactor_Controller/Slave_Photoreactor_Controller.ino
new file mode 100644
index 0000000..8f7acbb
--- /dev/null
+++ b/Digital Photoreactor Controller Firmware/Slave_Photoreactor_Controller/Slave_Photoreactor_Controller.ino
@@ -0,0 +1,59 @@
+////////////////////////////////////////////////////////////////////////////////////
+// Digital Photoreactor Controller Slave Program Controlled by I2C //
+// Run this slave program on the AtTiny85. //
+////////////////////////////////////////////////////////////////////////////////////
+
+#include "TinyWireS.h" // wrapper class for I2C slave routines
+
+#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);
+ delay(10);
+
+}
+
+void loop()
+{
+
+}