Abstract
Digital potentiometer is another form of DAC circuit, which has been widely applied in the measurement and control (MAC). However, the common use of digital potentiometer resistance value is limited to 10k?, 50k?, 100k?, 200k?, and its change of resistance is linear. This is often not suited to the needs of the measurement and control. And digital potentiometer chip is an imported product, thus, it is hard to buy with high cost. While 51 MCU is cheap, and its P0 port has no pull-up resistors. By connecting power resistor, simple digital potentiometer can be emulated. And the use of other parallel ports along with analog switch CC4066 can simulate digital potentiometer. And the resistance can be chosen according to various needs.
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