# Adafruit's Raspberry Pi Lesson 12. Sensing Movement ## Overview In this lesson, you will learn how to use the digital inputs on the GPIO connector with a door sensor and a PIR motion detector. ![](https://cdn-learn.adafruit.com/assets/assets/000/003/922/medium800/learn_raspberry_pi_overview.jpg?1396803871) In this lesson, we will concentrate on sensing movement and activation of the door switch. In Lesson 13 we will build on this security sensing to have the Pi use a digital output to control the power to an electrical appliance when movement is detected. - [Next Page](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-12-sensing-movement/hardware.md) ## Featured Products ### PIR (motion) sensor [PIR (motion) sensor](https://www.adafruit.com/product/189) PIR sensors are used to detect motion from pets/humanoids from about 20 feet away (possibly works on zombies, not guaranteed). This one has an adjustable delay before firing (approx 2-4 seconds), adjustable sensitivity **and** we include a 1 foot (30 cm) cable with a socket so you... In Stock [Buy Now](https://www.adafruit.com/product/189) [Related Guides to the Product](https://learn.adafruit.com/products/189/guides) ### Magnetic contact switch (door sensor) [Magnetic contact switch (door sensor)](https://www.adafruit.com/product/375) This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires). The other half is a magnet. When the magnet is less than 13mm (0.5") away, the reed switch closes. They're often used to detect when a... In Stock [Buy Now](https://www.adafruit.com/product/375) [Related Guides to the Product](https://learn.adafruit.com/products/375/guides) ### Assembled Pi Cobbler Plus - Breakout Cable [Assembled Pi Cobbler Plus - Breakout Cable](https://www.adafruit.com/product/2029) The Raspberry Pi B+ / Pi 2 / Pi 3 / Pi 4 has landed on the Maker World like a 40-GPIO pinned, quad-USB ported, credit card sized bomb of DIY joy. And while you can use most of our great Model B accessories by hooking up our [downgrade...](https://www.adafruit.com/product/1986) In Stock [Buy Now](https://www.adafruit.com/product/2029) [Related Guides to the Product](https://learn.adafruit.com/products/2029/guides) ### Assembled Pi T-Cobbler Plus - GPIO Breakout [Assembled Pi T-Cobbler Plus - GPIO Breakout](https://www.adafruit.com/product/2028) **This is the assembled version of the Pi T-Cobbler Plus.  It only works with the Raspberry Pi Model Zero, A+, B+, Pi 2, Pi 3 & Pi 4!** (Any Pi with 2x20 connector) The Raspberry Pi has landed on the Maker World like a 40-GPIO pinned, quad-USB ported, credit... In Stock [Buy Now](https://www.adafruit.com/product/2028) [Related Guides to the Product](https://learn.adafruit.com/products/2028/guides) ### Adafruit Assembled Pi Cobbler Breakout + Cable for Raspberry Pi [Adafruit Assembled Pi Cobbler Breakout + Cable for Raspberry Pi](https://www.adafruit.com/product/914) Now that you've finally got your hands on a [Raspberry Pi® Model B](http://www.raspberrypi.org/), you're probably itching to make some fun embedded computer projects with it. What you need is an add on prototyping Pi Cobbler from Adafruit, which can break out all those... No Longer Stocked [Buy Now](https://www.adafruit.com/product/914) [Related Guides to the Product](https://learn.adafruit.com/products/914/guides) ### Half Sized Premium Breadboard - 400 Tie Points [Half Sized Premium Breadboard - 400 Tie Points](https://www.adafruit.com/product/64) This is a cute, half-size breadboard with 400 tie points, good for small projects. It's 3.25" x 2.2" / 8.3cm x 5.5cm with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the breadboard as... Out of Stock [Buy Now](https://www.adafruit.com/product/64) [Related Guides to the Product](https://learn.adafruit.com/products/64/guides) ### Premium Male/Male Jumper Wires - 40 x 3" (75mm) [Premium Male/Male Jumper Wires - 40 x 3" (75mm)](https://www.adafruit.com/product/759) Handy for making wire harnesses or jumpering between headers on PCB's. These premium jumper wires are 3" (75mm) long and come in a 'strip' of 40 (4 pieces of each of ten rainbow colors). They have 0.1" male header contacts on either end and fit cleanly next to each other... In Stock [Buy Now](https://www.adafruit.com/product/759) [Related Guides to the Product](https://learn.adafruit.com/products/759/guides) ### Budget Pack for Raspberry Pi 1 Model B (Doesn't include RasPi) [Budget Pack for Raspberry Pi 1 Model B (Doesn't include RasPi)](https://www.adafruit.com/product/965) An optimized collection of parts and pieces to experiment with Raspberry Pi at home, school or work. Great for students and those that want to get their feet wet, no soldering required! **THIS PACK DOES NOT INCLUDE A RASPBERRY PI 1 MODEL B and is NOT compatible with Model B+ or Raspberry Pi...** No Longer Stocked [Buy Now](https://www.adafruit.com/product/965) [Related Guides to the Product](https://learn.adafruit.com/products/965/guides) ## Related Guides - [PIR Motion Sensor](https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor.md) - [Playing sounds and using buttons with Raspberry Pi](https://learn.adafruit.com/playing-sounds-and-using-buttons-with-raspberry-pi.md) - [Moonshine Voice Control on Raspberry Pi](https://learn.adafruit.com/moonshine-voice-control-on-raspberry-pi.md) - [Adafruit's Raspberry Pi Lesson 4. GPIO Setup](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup.md) - [Single Channel LoRaWAN Gateway for Raspberry Pi](https://learn.adafruit.com/raspberry-pi-single-channel-lorawan-gateway.md) - [Program an AVR or Arduino Using Raspberry Pi GPIO](https://learn.adafruit.com/program-an-avr-or-arduino-using-raspberry-pi-gpio-pins.md) - [IoT Temperature Logger with Analog Devices ADT7410, Raspberry Pi, and Adafruit IO](https://learn.adafruit.com/iot-temperature-logger-with-python-and-adafruit-io.md) - [Adafruit's Raspberry Pi Lesson 10. Stepper Motors](https://learn.adafruit.com/adafruits-raspberry-pi-lesson-10-stepper-motors.md) - [CircuitPython Libraries on Linux and Google Coral](https://learn.adafruit.com/circuitpython-on-google-coral-linux-blinka.md) - [Node.js Embedded Development on the Raspberry Pi](https://learn.adafruit.com/node-embedded-development.md) - [Adding Basic Audio Ouput to Raspberry Pi Zero](https://learn.adafruit.com/adding-basic-audio-ouput-to-raspberry-pi-zero.md) - [Analog Inputs for Raspberry Pi Using the MCP3008](https://learn.adafruit.com/reading-a-analog-in-and-controlling-audio-volume-with-the-raspberry-pi.md) - [Matrix and 7-Segment LED Backpack with the Raspberry Pi](https://learn.adafruit.com/matrix-7-segment-led-backpack-with-the-raspberry-pi.md) - [Adafruit AMG8833 8x8 Thermal Camera Sensor](https://learn.adafruit.com/adafruit-amg8833-8x8-thermal-camera-sensor.md) - [Programmable Wireless BLE Gesture Mouse](https://learn.adafruit.com/ble-wireless-gesture-mouse.md) - [Running OpenGL-based Games & Emulators on Adafruit PiTFT Displays](https://learn.adafruit.com/running-opengl-based-games-and-emulators-on-adafruit-pitft-displays.md)