RTC backup battery Lithium primary battery to back up the RTC on XU board. This battery can keep the RTC running up to 5 years without external power supply.
The HC-SR501 Infrared PIR Motion Sensor Module auto-senses light in various applications (in house, basement, outdoor, warehouse, garage, etc,) for ventilator control, alarm, etc. Infrared technology (LHI778 probe design) high sensitivity & high reliability. ultra-low-voltage. widely used especially for battery-powered products. This HC-SR501 Infrared...