Introduction: How to Read Multiple Analog Values Using One Analog Pin

About: I am an electronics hobbyist and I love to share my works with others

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 Uno

Arduino nano

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.? yes

Step 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 it

Step 3: Things Needed for This Project

  • nodemcu or arduino
  • 2*variable resistors
  • 2*diodes
  • breadboard
  • some wires

Step 4: Circuit Diagram

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

positives 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 connections

Step 5: Programming

Step 6: Blynk App Setup

download code and library

please watch the video for full instructions