Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Temperature and humidity sensor with serial output

This is quite simple temperature and humidity measuring board based on Atmega8 microcontroller. It uses a standard LM335AZ temperature sensor attached to AVR ADC port and NONEYWELL HCH-1000-002 humidity sensor. Microcontroller simply sends data via RS232 interface – so it can be viewed and processed on PC. Original schematic uses MAX232 converter, but it can be easily replaced with TTL to USB converter like FT232RL. Continue reading