I designed this IoT USB powered motion sensor so it could be powered by any old USB phone charger laying around the house. It requires soldering and It uses the following components:

Electronics perf board 22Ga. wire 2.54mm female pin headers 2-Pin Screw Terminal Block Connector 2.54mm Pitch AM312 Mini Pyroelectric PIR Human Sensor Module Infrared IR Sensor Detector ESP8266 ESP-01 (Black) WiFi Serial Transceiver Module with 1MB Flash (NOT ESP-01S) HT7333-A Voltage Regulator 1000uF Electrolytic Capacitor 100nF Ceramic Capacitor Jabinco Type A Male USB 4 Pin Plug Socket Connector with Black Plastic Cover