Flex Sensors not working properly

Other Hardware Sensors
1

Hello,

I'm working on a project to build a flex sensor glove which is supposed to interprete the sign language. To do that I need to attach 5 flex sensors. 2 flex sensors respond according to how much i bend them, so they are working fine but the 3rd sensor(4th and 5th also does the same thing) behaves as if I am constantly bending it. The values I am getting are normal for the 1st and 2nd sensors but the value for 3rd sensor keeps changing.

I wanted to use the simplest code to see if my sensors are working properly.

int flexPin1 = A0;
int flexPin2 = A1;
int flexPin3 = A2;
int value1;
int value2;
int value3;

void setup()
{

Serial.begin(9600);
pinMode(flexPin1,INPUT);
pinMode(flexPin2,INPUT);
pinMode(flexPin3,INPUT);

}

void loop(){

value1 = analogRead(flexPin1);
value2 = analogRead(flexPin2);
value3 = analogRead(flexPin3);

Serial.println(value1);
Serial.println(value2);
Serial.println(value3);
delay(1500);
}

My circuit diagram looks the same but there are 3 sensors instead of 1. (Included in the attachments)

Thanks in advance.

flex sensor cal.png
flex sensor cal.png2216×1420 324 KB

arduino.png

2

My recommendation is to triple check your wiring on the 3rd sensor. Sometimes jumper wires have breaks inside. Sometimes breadboard connections are not reliable. You can use a multimeter to check the continuity of the wiring from the sensor to the Arduino.

I would also recommend swapping one of the sensors that's giving good values with the one that's giving bad values to see if the problem follows the sensor.

3

Thank you for your reply. I just tried using different cables and tested each sensor individually but there is no difference. Sensors are working fine and the problem always starts with hooking up more than 2 sensors.

4

HJSmith:
Thank you for your reply. I just tried using different cables and tested each sensor individually but there is no difference. Sensors are working fine and the problem always starts with hooking up more than 2 sensors.

Change the order of reading the pins to 3,2,1 and see if you get good reading for pin 3 and not for pin 1

Paul

5

Hello, I've tried that as well but I'm still getting the same result.

6

What do you mean by "same result"? After changing the order, is the bad reading on A2, or is it on the 3rd reading?

7

It is again on the 3rd reading as always

8

I ve managed to solve the problem by changing the breadboard. It wasnt functioning properly for some reason.

9

HJSmith:
I ve managed to solve the problem by changing the breadboard. It wasnt functioning properly for some reason.

The reason was given to you in #1:

pert:
Sometimes breadboard connections are not reliable.

Typical for breadboards. A known source of connection errors.