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In this tutorial, I am going to show you how to read multiple analog values using only one analog input pin.
Step 1: Why You Want to This
if you are an electronics enthusiast or a hobbyist you might familiar with lots of microcontroller boards like
Arduino pro mini
esp 8266 nodemcu
Arduino Uno has 6 analog pin , nano has 8 pins, the pro mini has 6 pin
unlike other boards, nodeMCU has only one analog pin so if you want to be read more than one anlog value using nodemcu ? is it possible to read multiple analog values using only one pin.? yesStep 2: How Is That Possible?
we are done this by turning on and off sensors like multiplexing .first we turn on one sensor and we read the analog data from that sensor and at the next step we turn on the next sensor and turnoff the first sensor and read data from the second sensor that itStep 3: Things Needed for This Project
- nodemcu or arduino
- 2*variable resistors
- some wires
in this circuit diagram, you can see I connected positive terminals of variable resistors to digital pin 1 and 2 so we can turn off and on variable resistors by turning on and off the digital pins
connectionspositives of variable resistors to d1 and d2 grounds to grounds connect analog pins to diodes positive side connect diodes negative end to A0 of nodemcu I used diodes to overcome overlapping data that's all about connectionsStep 5: Programming
please watch the video for full instructions