Recycle Creality MB/Screen for PID Temp Controller

thingiverse

***Think this is good enough for general purposes. Plus I just blew all the PWM on it playing with a wideband Oxygen sensor. *Stay tuned on my CGTrader account design "ArduinO2", that project does work surprisingly well.* EEPROM added, Screen knob controls the PID setpoint. Press it to store it. No watchdog as you can just simply add a few "IF" statements or whatnot instead of having loads of code to fumble through. I might add watchdog later. Ill clean up the code sometime to make it easy to read. File "Creality PID Controller with Screen Input" is the latest file. Use "tempdogscreen_code" file if you want the older version, but with watchdog(in auto-system interrupt then reset).*** Video demo uploaded:https://youtu.be/uTS_a1yQuv4 LGA12864 screen readout code added. Nothing fancy, just temp readout for now. Ill throw in the bells and whistles soon. Watchdog added for safety. Will monitor probe values and when the probe falls outside normal operating parameters or gets unplugged, board will pull output(keep trying every 2 secs) until probe it reconnected or replaced; then will output normally. This is a general repurpose of a Creality Mainboard for controlling two outputs based on temperature readings from a probe NTC-100. The code is basic Arduino, so if you know what your doing, you can rename the pins appropriate to your use. **Also raw sensor reading should be in the 979 area in an environment of 25c or 73F. If your probe is different, then you need to compensate the formula to have your readout in proper F. These sensors are actually pretty sensitive to temperature, so you can slow the sample rate so every second or so and still have reliable temperature readings to trip a output.** Basic parameters are trigger point at ~80degrees F. Each probe controls their own output. I'm including the pinout for standard Creality boards so you can understand which outputs I have currently setup if your building exactly the same as mine. Pictures to come soon. Included is a general portable case for these boards. Probe 1 plugs into E hot. Output 1 is B Heater. Output 2 is E Heater. Switch is Z-stop. Note the operating principle is AND/OR waiting for input from a switch and/or 80F reading from a probe -> control On/Off of two outputs. Meaning the two outputs can be triggered by the switch and the probe going over the set limit. Either/or.**Currently only using one output due to blown mosfet.** Note PID tuning is auto unless changed in the code. ***More tips on how to change for your use:*** *"wSetting" is your watchdog setting(1-3)(default 1)*[1--loops the watchdog when tripped, 2--resets the controller, 3--force output off then reset controller]*. * *"Setpoint" is user target value.* *"SampleTime" is how often watchdog checks the probe(default 0.5sec). *"inAuto" is your way to turn PID auto tuning on and off(true = on, false = off).*