These lenses are curved in such a manner so that sensor can cover a wide range. As shown in the above schematic diagram for Raspberry Pi and PIR sensor based motion detector, the positive pin of PIR ...

This expanded capability allows a Raspberry Pi ... diagram of the alcohol detector. The circuit includes an Arduino Uno board (MOD1), four LEDs (L1 through L4), two buzzers (B1 through B2), an OLED ...

So the sensor and the LCD should be connected with Raspberry Pi as show below. You can either follow the circuit diagram above and make the connections or use the pin table to follow up with the GPIO ...

which can be controlled using the software program on the Raspberry Pi. This will allow the resistance values to change across the circuit to detect voltage fluctuations across the sensor.

For software development, either Raspberry Pi's C/C++ SDK, or the MicroPython is available. In this tutorial, we will use MicroPython ... then the state of the LED can be controlled. The two circuit ...