This product is a narrowband IoT (NB-IoT) shield for Raspberry Pi. NB-IoT is very suitable for IoT applications with its low power consumption feature. The shield also has the built-in 3-axis accelerometer, temperature, humidity, light sensors, optocoupler, and relay. It is also possible to add your own sensors using the built-in 4 channel ADC. All in all it is a fun project to build and I'm looking forward to begin revision 2.0: Replace the raspberry pi (~35$) with nvidia jetson nano (~99$), maybe add small ml training for contrast, rebuild the bottom half for better light absorption, source multiple color lasers, use fiber optics bundle for multiple angles and make the system. Placing a finger on the sensor, the variation of light will be detected by a phototransistor. The raw signal detected consists of DC and AC parts caused by the reflection of light on the finger tissue and the pulsatile blood respectively. ... Raspberry Pi 0/W Power HATCool looking Power supply board for raspberry pi 0 or 0W.Lipo powered USB-C.

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