Recently an ad on YouTube about an acoustic light sensor/switch module piqued my interest. Out of curiosity, I contacted the online vendor and bought a pair. Named MR-SK50A, the module is less popular ...

Moreover, the S16-L221D sensor lets you add a light dependent resistor (LDR). It is not very practical in this Grove-mini PIR motion sensor module, especially because of the ‘tight’ PCB artwork. The ...