Project schematic

The peripherals we need to build this project are:

• PIR sensor
• Raspberry Pi 3 or Intel Edison with Arduino breakout kit
• Google Firebase account
• Wire jumpings

You can buy a PIR sensor in an online store such as Amazon, Sparkfun, or Adafruit.

The following diagram describes how to connect the PIR sensor to the Android Things board if you are using Raspberry Pi 3:

If you are using Intel Edison with Arduino breakout kit the connections are shown here:

In this case, we can directly connect the sensor to our board. The connections are:

• Connect the PIR to the pin that supplies +5V
• Connect the ground PIR pin to the ground of the board
• Connect the PIR signal to pin 7 for Raspberry or pin 4 for Intel Edison

As you can notice, the sensor connects to +5V in both cases: Raspberry and Intel Edison. The signal pin provided by PIR is zero when no motion is detected and +3V when the motion is detected. Considering that the high level supplied by the PIR is +3, then we can connect the PIR sensor safely to Raspberry Pi 3.