It is a knock sensor. When you knock it, it can send a momentary signal. We can combine it with Arduino to make some interesting experiment, e.g. electronic drum.
General
Brand
Keyestudio
Model
N/A
Form Color
Black
Quantity
1Set
Material
FR4
Specification
Working Voltage
DC 3.3~5V
English Manual / Spec
No
Download Link
http://www.keyestudio.cc/h-nd-54.html
Other Features
Other Features
Specification: Working voltage: DC 3.3V-5V Working current: 20mA Working temperature: 10~50 IO Interface: 3 wire interface (-/+/S/) Output signal: TTL voltage
Dimensions & Weight
Dimensions
1.38 in x 0.79 in x 0.35 in (3.5 cm x 2 cm x 0.9 cm)
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