splittorff / kiln-control

Arduino project for temperature using a K-type thermocouple, and a serial interface.

Common Object Temperature Controller

Arduino project for temperature sense and control using a K-type thermocouple, and a serial interface.

Unit of measure used is farenheit.

The default setpoint is 1050*f.

Controls

This kiln controller accepts serial commands, which can be issued individually or in a chained string (let # represent a number from 0-9):

P#.## - P of PID, followed by a float

I#.## - I of PID, followed by a float

D#.## - D of PID, followed by a float

T### - Temperature, followed by an int

Example Commands:

P2 - sets P value to 2.00

P0.01D0.3T940 - sets P value to 0.01, D value to 0.3, and Temperature to 940*f

T1050 - sets the temperature setpoint to 1050*f

Hardware

• Max6675 with breakout
• K-Type thermocouple
• Arduino Nano
• HC-06 Bluetooth TX/RX (optional)
• 1k ohm resistor (part of voltage divider for bluetooth)
• 2k ohm resistor (also part of voltage divider)
• 15amp or 20amp Relay (This depends on your wattage (watts/120 = minimum amps)

*Notes: There is a 500ms delay within the loop to allow for the Max6675 chip to settle. Without this delay, the values are not useable. *