In the example, 1 PID controller is used. This example successfully works on all STM32F4xx development board such as Discovery and Nucleo. For every project you have to set parameters for specific project. This is just a sample project, so PID parameters are not set optimal. According to the error between both sensors, more error, more duty cycle to DC fan. Everything is displayed via USART to computer. Then, I touched the second DS18B20 near DC fan and I heated them. In my case, it was about 23☌ on the reference sensor. The goal is, that both temperatures are the same. Second sensor is placed near DC FAN, so when DC fan is turned ON, it is cooling the second DS18B20. We have one device connected as “reference” temperature. More calculations you have, more integral error you have. If you read about PID controller, you realize that you cannot calculate PID controller results every x microcontroller, because it has integral part which is used to sum all the errors in period. They are configured in 12bit resolution, so delay between 2 calculations is about ~750ms. In the project, 2 DS18B20 temperature sensors are used. If you need additional info about these functions, you have detailed manual here. There are also ARM PID structure, where you pass PID parameters. More you can look on the sites below:ĪRM company provides 3 different PID controller functions:įor each of the three types, you have three functions:

I will not go step-by-step on how PID works.

Labview pid dc motor control tutorial