Posted in how-to, Microcontrollers Tagged diy, IoT, mqtt, node-red, temperature sensor, Wemos d1 ← Ice Fishing Tent Makes Winter Ham Radio Comfy Retro Breadboard Gives Up Its 1960s Secrets → ...

I used an LCD shield to display the current temperature and speed of the fan, but you can use the circuit without the LCD display. You also need to select the transistor by the type of fan that you ...