Best low-cost environmental sensing solution with BME280 and Si1132 on one board. The combination of the BME280 sensor and the Si1132 sensor enables measuring temperature, barometric pressure and humidity, UV Index and ambient light at once. 6pin header socket is already soldered. You can simply plug it on to the right connector.
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...