7/26/2023 0 Comments Max6675 v1.2 arduino nano pinoutInstall the Arduino MAX6675 library for both Fahrenheit and Celsius temperature measurements. The five-pin electrical interface consists of two power pins and three data I/O pins. This temperature sensor module incorporates the MAXIM 6675ISA eight-pin integrated circuit soldered to a PCB (printed circuit board) substrate. This hardware is supported in the standard Arduino IDE library. This is a popular Arduino shield that integrates a 16-character by two-line LCD display with five navigation buttons and one reset button. An Arduino Nano and breadboard were used for actual SSR bench testing purposes. Two optional LEDs provide a visual indication of PID variable outputs. 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. PID myPID(&Input, &Output, &Setpoint,300,0.» 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. Specify the links and initial tuning parameters Define Variables we'll be connecting to They would get a few minutes worth of readings and then blow up. I was usually using it at 65c and 40c.īoth chips stopped working just after I started the oven. I don't think it got too hot in there, because the max temperature that the oven got to was 110C. I did have the circuit inside the oven's enclosure. Is there something wrong with the circuit or am I sampling the thermocouple too often by calling on it every second? It worked for about a week then blew up like the other. I changed the code and used only one MAX6675 and thermocouple. The Arduino is directly controlling the SSR with pin 8.Įverything ran perfectly for a few days then one of the MAX6675 chips blew up. I've set up a temperature controlled oven with an Arduino Nano, 2 MAX6675 breakout boards, 1 SSR, and 2 Type-K Thermocouples.
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