HAMITRONIK - One Wire Matrix Keypad 3x4

Описание: Standard matrix keypad on the market generally requires 7 to 8 pins that are connected to the I/O path of a microcontroller. Sometimes we need a lot of I/O paths on the microcontroller, especially when using many sensors, actuators and other peripherals in one microcontroller unit.

The following is one solution. One Wire Matrix Keypad 3x4. The concept of a simple voltage divider uses several resistors arranged in such a way as to the column and row paths of the matrix keypad. Generate an analog voltage whose value varies for each button, where the value of this voltage is enough to flow through one line / wire only to one pin in the ADC microcontroller path.

This method is very common and widespread. You can apply the same method to both the 3x4, 4x4, and other matrix keypads. Of course, by changing the resistor value appropriately so that the desired analog voltage value is reached.

The reference for the 3x4 matrix keypad circuit in this video refers to the following link, with changes in some resistor values for personal purposes :
https://www.instructables.com/id/Ardu...


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All brands that appear on this video in the form of hardware or software are their ownership.


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