Hi, I bought a ph shield for arduino from china and i couldn't find the schematic online. The leads coming out have the following symbols. What do they stand for? I know the second G is ground and v+ is 5 volts. Not sure what the others stand for. Thanks "To" - "Do" - "Po" - "G" - "G" - "V+"

Help with Ph sensor pin abbreviations

sonnyyu October 3, 2015, 12:48am 6

sonnyyu:

V_ph-=V_zener/2

p_AOUT is output of PH. connect digital multimeter to confirm.

The diagram of board.

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