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Non-contact liquid level sensor can be used to provide external monitoring in liquid non-metallic material tubes
USB Input interface 1 way trigger input Reading range 20m to 35m Status indicators buzzer Antenna 12dbi circular antenna Power supply DC＋9V Size 440mm×420mm×56mm Weight 1
there are three digital pins: Clock
Control via AT commands
The sensor voltage output can be used to trigger a relay to enable a lamp and shutdown the lamp when the sunlight is back
ATtiny85 - AVR 8 Pin 20MHz 8K endstop Non-contact liquid level sensor canAtmel's itty bitty ATtiny85 8 Bit Processor. 8K of program space, 6 I O lines, and 4 channel 10 bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. Atmel ATtiny85 Datasheet
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