Fortunately, this leaves digital pins 3 and 11 (both on 16-bit TIMER2) available to use for Pulse Width Modulation (PWM) outputs: pin 11 to heat (plus +) pin 3 to cool (minus -). Soldering the MAX6675 module is optional for initial testing ( Figure 3).Īnalog pins A1-A5 were enabled for digital function to provide temperature sensor power and communication. Assembly is simply a matter of observing the correct orientation and fitting the sub-units together. This PID controller device consists of three sub-units: an Arduino Uno R3 MAX6675 thermocouple temperature sensor and1602 LCD keypad display. Once programmed on a PC (in the normal Arduino IDE way), the unit can be taken out to the process shed for stand-alone operation.įIGURE 2. The Arduino controller that I eventually made stores a number of time vs. Refer to Figure 1.įIGURE 1.Thermal application block diagram. The thermal control system is composed of the PID controller, solid-state relay (SSR), and 1,500W hotplate. temperature profile to process the vegetables properly. The farmer’s canning application required executing a specific time vs. For these reasons, I decided to build an Arduino PID temperature control unit. Plus, the Arduino integrated development environment (IDE) is easy to install and remarkably easy to use.
The Arduino product family provides inexpensive hardware for the home builder. Of course, many fine industrial process controllers already exist (say, from Omega), but I strived to learn their secrets and do it smaller and cheaper. So, when a local farmer asked me to automate a vegetable canning process, I took it as a challenge to physically realize a PID temperature control device. » Skip to the Extras Advanced Process Control Technology for little cost.īeing a devoted nerd, I’ve long been fascinated by Proportional Integral Derivative (PID) process control.
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