Hey guys -
I'm following up from previous posting my friend put up and am in need of additional guidance. See here for the previous post: Arduino Uno PID Control and Kapton Heater - Motors, Mechanics, Power and CNC - Arduino Forum
Repeated
Project Goal: Heat up a 1/2x3x4" aluminum platform anywhere from room temperature to 150F using a 1x2.5" Kapton heater and an Arduino Uno. Let the user set the temperature within this given range. Use a thermocouple to read the temperature of the platform and have the temperature displayed on an LCD monitor.
At the moment we have the LCD/thermocouple hooked up to the Arduino and am able to read temperatures. Using the temperature reading I want the Arduino to switch a relay on and send current to the foil heater if the platform is below 150F and turn it off it is above. We have the powerswitch tail 2 (Powerswitch tail 2 : ID 268 : $25.95 : Adafruit Industries, Unique & fun DIY electronics and kits) which acts as our relay to bring 120VAC to the foil heater. Based off of our heat xfer calcs this source will be adequate to heat up the platform.
Does anyone have suggestions on how I can take the data from the thermocouple and have the Arduino control the relay? Also due to the thermocouple and LCD use with the UNO I only have 1 PWN pin and 2 digital input pins left on my board.
Any help would be appreciated, thanks!
-Matt