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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
or if you simply need to sense the presence of an object by measuring strain or load applied to a surface
Use this alarm to stop draining the lipo battery completely and this increases battery life and preserves the battery performance
4V or 6V lead acid batteries
Small Digital Indicator Round Panel Voltmeter(AC) magnet To connect with other slaveIntroduction : Indicator Voltmeter Red Round 20: 500VAC 3 Digit 22mm Features : Indicator Voltmeter Round 20: 500VAC 3 Digit 22mm AC 20v 500 v
