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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.

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