Hello there. Welcome to our website. Are you working on Flex Sensor-based project? Do you want to know how the sensor works? Do you want to make a hand movement-controlled robotic device? Well, In this article we will be discussing how to interface the sensor with Arduino in a detailed Step-by-step guide and we will also see the circuit diagram, components required, and Arduino code. I hope you will like the article. We have already made various Arduino projects, Embedded projects, and Arduino tutorials on our website. You can visit them if you are new to the world of electronics and Arduino. you will find them helpful.

What is Flex Sensor?

This is a sensor that measures the change in the direction of the sensor with respect to its normal position. When there is any bend or change in its shape, it gives a change in its readings. This data is Analog type in the range of 0-1023. so there we can use this sensor to make multiple conditions. that we used in our sign language project which is the biggest hit over the internet.

Nowadays, many people are working on projects such as hand-controlled or movement-controlled robots, which use the same type of flex sensors to transfer the physical hand movement into an electrical signal. One can also make their own hand movement-controlled toys using five different sensors for five different fingers as their fun DIY project.

How does It Work?

This works on the basis of variable resistance such as a potentiometer. The resistance of the sensor changes with the angle to which it is bent. there as many types of flex sensors available in the market but the one we are using here is the resistive type. it is thin and long about 10 cm. the flex sensor may use in robotics. many people use this flex sensor in the animatronic hand. this can be the best final year project for ECE students.

Inside the sensor, there are conductive strips placed on top of each other. when there is bent, they make contact at different points, thereby increasing the resistance. the resistance values of each individual sensor may have some difference, hence one must understand this before using them in their project.

Components Required

Arduino UNO	BUY LINK
Flex sensor	BUY LINK
Jumper Wires	BUY LINK
Breadboard	BUY LINK
10K ohm Resistor	BUY LINK
2x 220 ohm resistor	BUY LINK
LED’s (Blue and Green)	BUY LINK
USB Cable for uploading the code	BUY LINK

Flex Sensor Working With Arduino Circuit Diagram

Arduino	Flex Sensor	10k ohm Resistor
( +5V )	Terminal 1
A0 Pin	Terminal 2	Terminal 1
GND		Terminal 2
Arduino UNO	LED B	LED B	220 Ohm Resistor
D7 Pin	Anode Pin
D6 Pin		Anode Pin
GND			Terminal 1
	Cathode Pin	Cathode Pin	Terminal 2

Serial Monitor

// Techatronic.com  Flex Sensor Working With Arduino Code

 void setup()  
 {  
   Serial.begin(9600);   
   pinMode(7,OUTPUT); // Red Led pin  
   pinMode(6,OUTPUT); // Green Led pin  
 }   
 void loop()   
 {  
  int s1=analogRead(A0);   
  Serial.println(s1);      
  delay(50);  
  if(s1>100 )  
  {  
   digitalWrite(7,LOW);  // Red Led off  
   digitalWrite(6,HIGH); // Green Led on  
  }  
   else  
  {  
   digitalWrite(7,HIGH); // Red Led on  
   digitalWrite(6,LOW); // Green Led off  
  }  
 }  

Once the above Arduino code uploading is done, you can test the working of it by bending the sensor and looking at the color of the led. If the color is Green when bent, it is working. I hope you found this tutorial helpful. If you have any queries or doubts, you can ask them in the comment section below.