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Author Topic: ph-logger from cheap ph meter from DX  (Read 15684 times)
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Sorry for taking so long with my update.
I got the new meter open yesterday, it seems to be a little different from the old one.
I got 2.5V on some of the pins that I think go to the LCD.




It looks like it might be possible to solder some wires to the pads in the PCB under the LCD and still get the LCD back on and working.

The micro-controller is ICL7106CM44, I think
http://www.intersil.com/content/dam/Intersil/documents/fn30/fn3082.pdf
http://www.digikey.com/product-detail/en/ICL7106CM44/ICL7106CM44-ND/936120

Any ideas what I should now do?
Remove the LCD and try to solder wires to the pads?
But what if I don't get the LCD back on.  How do I compare the input on my arduino to the pH, if I cant see it on a LCD?
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Denmark
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The ICL7106CM44 is not a micro controller - it's an voltmeter chip

The voltage on it's input can be read by the Arduino analog input.

// Per.
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The ICL7106CM44 is not a micro controller - it's an voltmeter chip

The voltage on it's input can be read by the Arduino analog input.

// Per.

Anyone made this work?
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Just a word of warning regarding LCDs - they do NOT use DC current like an LED display, so there is little point in measuring voltages on the LCD pins. An LCD actually use AC voltage for the activation of the segments. The common is a phase driver, and it will alternate between 0 and Vcc, while the segments alternate on a reversed phase when they are lit, and the same phase when they aren't. The frequency is usually 30-60 Hz, depending on the specifics of the LCD. Applying DC voltage to an LCD segment for a prolonged time, will result in it fading and not being useable.
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