Temperature/Humidity Controller Module

This PCB was developed for 5VDC ventilation systems to control when fan units would be switched on/off

I designed the initial version and footprint of the fan controller. It's a simple circuit with a microcontroller receiving data from a DHT22 sensor and then triggering a solid-state relay to turn on/off a fan.  The footprint was designed to be as compact as possible to work with the Parkonect 7TST mount. A micro termination block was used to terminate the fan power cables. The entire system was powered by 5VDC via a USB-C connection on the microcontroller. A basic and preliminary software program was also developed and deployed.

The project was turned over to the electrical engineering team after the first prototype units were tested and deployed. Further improvements were made after including,

• Removing SSR and using a series of transistors instead

• Removing micro termination blocks and instead using micro Molex plugs compatible with the fans we were supplying

• Adding diagnostic headers and outputs to allow the use of data loggers.

The project is still ongoing with further improvements being made.