The output voltages will be is 1.25v at R4, 3v at R3, 4.5v at R2 and 5v at R1. If we use 4 resistors in series R1+R2+R3+R4 with the same 5v input then we will get 4 different voltages when keeping the ground pin common. Now if we read the voltage from Vout we will get half of the Voltage that is 2.5V. For example, Connect two 4.7K Ohm resistors R1 and R2 in series, the first end connected to +5V and the last end connected to Ground and Vout taken out in between R1 and R2. Voltage divider circuit divides the voltage in between two different resistors. In this topic, we will see how to use the keypad with using only one pin of Arduino.īefore moving further we need to know about the Voltage Divider Circuit. ![]() Even it reduces the number of GPIO pins to interface with Arduino still we may require more pins for other hardware. ![]() The 4×4 matrix keypad has 8 pins to interface with Arduino.
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