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or if you simply need to sense the presence of an object by measuring strain or load applied to a surface
When a touch is sensed on the circular marked region
Mounting Hole Diameter: 4mm
More than that and you will exceed the voltage limit of your Arduino input
To connect with other slave devices a master module would be necessary such as the HC-05 version which can do both master and slave
Small Digital Indicator Round Panel Voltmeter(AC) magnet or if you simply needIntroduction : Indicator Voltmeter Red Round 20: 500VAC 3 Digit 22mm Features : Indicator Voltmeter Round 20: 500VAC 3 Digit 22mm AC 20v 500 v
US$ 95.00
US$ 95.00
US$ 29.99
US$ 95.00
US$ 95.00
US$ 95.00
US$ 95.00