This data logger project based on firmware-only USB implementation. There are two part in this project, transmitter and receiver. The transmitter consist of ATTiny45 microcontroller, a SHT11 sensor (digital temperature and humidity sensor) and a hoperf RFM12 868 MHz transceiver module. The transmitter powered by 2 AA cells. While the receiver uses ATMega8 µC and the same RFM12 module. After received data from transmitter wirelessly, It will send the data to PC via USB.
Schematic and Software
Wireless Data Acquisition
Read Wireless Temperature And Humidity