The pinout diagram for the Raspberry Pi Pico is incorrect. In the example code provided with the SDK, Pin 4 is identified as I2C Port 0 SDA and Pin 5 as I2C Port 0 SCL. From my testing, this seems ...

Circuit Diagram for Raspberry Pi and PIR Sensor based Motion Detector. As shown in the above schematic diagram for Raspberry Pi and PIR sensor based motion detector, the positive pin of PIR sensor is ...