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3. DHT22 data sheet: https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf.
4. Crowdsourcing Urban Air Temperatures through Smartphone Battery Temperatures in São Paulo, Brazil
5. Elitech RC5: http://www.elitech.uk.com/temperature_logger/Elitech_USB_Temperature_Data_logger_RC_5_147.html.