Lesson 8 Vibration Switch

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Introduction

A vibration switch, also called spring switch or shock sensor, is an electronic switch which induces shock force and transfers the result to a circuit device thus triggering it to work. It contains the following parts: conductive vibration spring, switch body, trigger pin, and packaging agent.

Required Components

– 1 * Raspberry Pi

 1 * Breadboard

– 1 * Dual-color LED module

– 1 * Vibration switch module 

– 2 * 3-Pin anti-reverse cable

Experimental Principle

In a vibration switch module, the conductive vibration spring and trigger pin are precisely placed in the switch and fixed by adhesive. Normally, the spring and the trigger pin are separated. Once the sensor detects shock, the spring will vibrate and contact with the trigger pin, thus conducting and generating trigger signals.

In this experiment, connect a dual-color LED module to the Raspberry Pi to indicate the changes. When you knock or tap the vibration sensor, it will get turned on and the dual-color LED will flash red. Tap it again and the LED will change to green – just between the two colors for each tap or knock. The schematic diagram:

Experimental Procedures

Step 1: Build the circuit. 

Raspberry PiGPIO Extension BoardVibration Switch Module
GPIO0GPIO17SIG
3.3V3V3VCC
GNDGNDGND
Raspberry PiGPIO Extension BoardDual-Color LED Module
GPIO1GPIO18R
GNDGNDGND
GPIO2GPIO27G

For C Users:

Step 2: Change directory. 

    cd /home/pi/SunFounder_SensorKit_for_RPi2/C/08_vibration_switch/

Step 3: Compile.

    gcc vibration_switch.c -lwiringPi

Step 4: Run.

    sudo ./a.out

For Python Users:

Step 2: Change directory. 

    cd /home/pi/SunFounder_SensorKit_for_RPi2/Python/

Step 3: Run.

    sudo python3 08_vibration_switch.py

Now tap or knock the module and you can see the dual-color LED flash red. Tap the sensor again, and the LED will change to green. Each tap or knock would make it change between red and green.