Hello,
Ive got a subzero fridge that has 7 touch keys and a 6 pin matrix connector. At the end of the day im looking for something that would push the buttons, doesnt have to be arduino. Ive attached the photos of the keypad.
Pictures cannot tell if the switches are applying a voltage to a pin on the connector or applying a ground to a pin on the connector. Nor can they tell if more than one pin is connected at the same time.
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There may be a schematic somewhere on the equipment or you may be able to find one with an internet search for your specific model.
Something other than a finger?
lol no, more like another keypad. This replacement part is not made anymore and can cost $300+
What started your quest for a new keypad? Do you know if the current pad is real switches making contacts, or is it an elastomeric keypad with resistant foam being depressed to give a sudden lowering of resistance?
There are plenty of keypads available on line similar to that, but first you have to understand how the keys are connected on the one you have.
Seven keys and a six pin connector suggest some sort of matrix, maybe 3x3, with two unused. Use your multimeter to determine what buttons are connected to which pins, and how. You may have to dismantle it to be sure.
This is a very good question. Ill have to try and take it apart, but i may have to break the panel to do so. Im pretty busy the next 10 days or so, so give me a bit to respond.
thanks
I will be away from the project for a week or so. Is there any videos or something showing the basic philosophy of how to trace key functions with a multimeter that i can research in the interim.
Thanks!
The multimeter has an Ohms (resistance) scale, and probably also a selectable continuity check buzzer, which beeps if a good connection is made between the probe leads.
To trace the circuit, measure the resistance or check continuity between pairs of leads on the keypad connector, while pressing and releasing a button.
And if you can, take a picture and print it and write your readings on the picture, pointing to the leads you are measuring.
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