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Wireless Temperature and Humidity Sensor with USB Interface
The sensor unit consists of an ATTiny45 microcontroller, a SHT11 sensor, and a hoperf RFM12 868 MHz transceiver module. It is powered by 2 AA cells and is expected to give >1 year of battery life. The receiver uses the same RFM12 module and an ATMega8 µC; received data is transmitted via USB to the PC.
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Build your own LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and "Zero Out" function to make sure the readings are as accurate as possible ... [more] |
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