Now, I would like to add air flow to the microcontroller based hydroponic system. Let’s customize commercial CPU coolers to control air circulation for plants 🙂
1.Original CPU Cooler
The original coolers are powered by USB 5V.
2. Understand the speed control
The speed control has 4 positions. OFF, Low, Medium, High. I tried to open the speed control box, but I failed very bad …
So, I just decided to cut the wire and directly connect the power and gnd wires into the Infineon DC Motor controller shield. With this, we can control the fan speed by PWM. I should have thought about it at the beginning …
Here is the Platform UART log. The PWM sets the cooler fan speed. 255 is the maximum. 124 is medium.