Vibration sensor detect motions/movements. They can be found in alarm systems, toys and security devices.
This is a basic vibration sensor board. The sensor itself is the SW-18015P, a spring type, non-directional vibration induced trigger switch. It is basically a tube with spring inside that act like a switch. The spring wraps around a center pole. When there are movements, the spring makes contact with the pole and acts like a closed switch. When everything is still, the switch is open.
The board has a LM393 voltage comparator chip to give out digital output and a potentiometer for sensor sensitivity adjustment. The working voltage of this module is between 3.3V and 5V. There are three pins for output marked as VCC, Ground and DO.
The DO pin gives digital output and you can read it easily with any microcontroller/microprocessor. When the sensor detects vibration, it gives output LOW. When no vibration detected, it gives output HIGH.
There are 2 status indicator LEDs on board. The red one is to tell us the power is connected and the green one is for the status of vibration detection. There is also a mounting hole on the PCB so that you can fix the position of this module.
User guide:
When using this sensor module for the first time, you'll need to adjust the sensitivity so that it'll detect vibration correctly.
Connect VCC pin to 3.3V-5V voltage source and GND to ground. The DO pin goes to your microcontroller I/O pin
Turn the potentiometer all the way until you see the green LED turned on
Then, turn the potentiometer slowly in the opposite direction and stop right after the green LED turned off
Gently tap the sensor and you'll see the green LED blink momentarily
The sensor board is now set to detect vibration.
Technical details:
Highly sensitive SW-18015P vibration sensor
Operating voltage: 3.3V - 5V
Red LED - operational status indicator
Green LED - output status indicator
Green LED ON, output LOW - vibration detected
Green LED OF, output HIGH - no vibration detected
A potentiometer that can be used to adjust sensitivity
