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$10 Arduino WiFi Motion Detector (PIR) That Writes to SQL Via Cheap ESP8266 Module : 5 Steps - Instructables
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Arduino home security system using Sim900 Gsm module, Pir motion detector and magnetic door contact switch
GitHub - endysh/Wireless-PIR-sensor: Low cost Arduino based wirless PIR motion sensor, uses nrf24L01 module for wireless communication
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