ControlTEC

Peltier (TEC) controller with fine termperature control and slow temperature ramping

Notes about software

• Code tested using the Arduino IDE 1.6.9 - https://www.arduino.cc/en/Main/Software
• Code written for Arduino Nano v3 and uploaded using AVRISP mkII programmer, part of the Arduino IDE
• The Arduino Nano's ADC circuitry is only 10 bit, to achieve a temperature resolution of +/- 0.1 C, the ADC's are oversampled to improve their theoretical limit to 13 bit.

Hardware setup

• Arduino nano v3
• Pin A0 - Connected to a 2N transistor used to switch a relay, H-bridge, reverse polarity across the peltier
• Pin 6 - Reference temperature thermistor (10k therm with 10k resistor as divider)
• Pin 7 - Peltier chip thermistor (10k therm with 10k resistor as divider)
• Pin 8 - User interface button
• Pin 9 - PWM pin to control fan speed
• Pin 10 - User interface button
• Pin 11 - PWM pin connected to the gate of MOSFET used to regulate the current flow to the peltier chip
• Pin 12 - User interface button
• Pins 7, 6, 5, 4, 3, 2 - Used to drive the LCD screen

Required libraries

External libraries

• eRCaGuy_NewAnalogRead.h 2.1 alpha (GPLV3) - http://www.electricrcaircraftguy.com/2014/05/using-arduino-unos-built-in-16-bit-adc.html
• FastRunningMedian.h 0.1.01 - http://forum.arduino.cc/index.php?topic=53081

Inclluded as part of the Arduino IDE 1.6.9

• EEPROM.h
• LiquidCrystal.h
• math.h