The Knock Sensor Module detects when the module is tapped, hit, bumped or otherwise knocked about.
- Knock Sensor Module
KEY FEATURES OF KNOCK SENSOR MODULE:
- Outputs a logic LOW when module is knocked
- 3.3 and 5V compatible
This module incorporates a mechanical knock sensor consisting of a coiled spring held fixed in position on one end and free floating on the other end. It is encased in a clear plastic housing.
The output of the module is normally pulled HIGH via an integrated pull-up resistor. When the sensor is knocked or tapped, the free end of the spring moves and makes contact with the ground terminal and the output transitions LOW for a short time and then returns back to HIGH.
There is a 3-pin header on the assembly for making connections.
1 x 3 Header
- ‘-‘ = Ground
- Center pin = Vcc (3.3 – 5V)
- S = Signal output, connects to digital input on MCU
OUR EVALUATION RESULTS:
This is a simple module that can be used to experiment with a number of applications that take some type of action when a physical knock or tap on the module is detected.
The module is not very sensitive and the sensitivity can depend on the module orientation. Also be aware that the spring tends to create a very noisy output, so some type of debouncing in software will usually be required to get an output that is clean enough to be usable. Finding use in practical applications is very limited.
If you are looking for a more capable sensor, the 801S Vibration Sensor Module below would be a better choice.
|Operating Ratings||Vcc Range||3.3 – 5V (match to MCU)|
|Logic high (normal operation)||Pulled to Vcc|
|Logic Low (knock detected)||Pulled to Gnd|
|Dimensions||L x W (PCB)||20mm x 15mm (0.79 x 0.6″)|