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“Essentially it is about the same idea like in my previous instructable: https://www.instructables.com/id/Home-Security-With… The only change is use of Orange Pi board (my choice was PC2) and one 4050 level shifter to protect boards IOs …

“In this article we will try to improve the draft four-channel voltmeter output on the Nokia 5110 . The voltmeter is able to measure four channels and the result will be displayed in the form of an analog slider. Measurement range …