Multiple bend sensors for Arduino

Community General Discussions
1

I am trying to build robot control by finger movement so I choose flex band sensor. Anyone has suggestion how to wire it up?

I tried 2 sensors, the A0 sensor works but A1 doesn't. I think the way to wire them up is tricky and confused me. Single sensor was easy, but up to 2 I have no idea how it works.

flex_multi.jpg

Here is the code I use:

/////////////////////////////////////////////////////////

void setup(){
  Serial.begin(9600);
}

void loop(){
  int sensorA, degreesA, sensorB, degreesB;
 
  sensorA = analogRead(0);
  sensorB = analogRead(1);
 
  degreesA = map(sensorA, 540, 820, 0, 270);
  degreesB = map(sensorB, 540, 820, 0, 270);

  Serial.print("a0: ");
  Serial.print(sensorA,DEC);
  Serial.print("   degA: ");
  Serial.print(degreesA,DEC);
  Serial.print("       a1: ");
  Serial.print(sensorB,DEC);
  Serial.print("   degB: ");
  Serial.println(degreesB,DEC);
 
  delay(100);                    
}

////////////////////////////////////////////////////////

2

It’s a pot

It’s just a pot. A resistor really --one that can change it’s value. Wire it just like you would any other ADC-friendly part (LDR etc) --10k pull up to one of the connections and to your ADC pin, the other connection to ground.

3

Thanks!! because the sample

Thanks!! because the sample I found the resister was connect to gound which confuse me how to wire up if I have multiple.

4

I just update the way I try

I just update the way I try to wire them and sample code I modified from sample code. 2nd sensor is not really showing correct info.

5

The second picture is correct

The picture that shows just one sensor with gnd, 10k and “to analog input” is the correct one. You simply need to repeat that set-up for each sensor. That’s it. 

(The picture showing 4 (or so) sensors and the arduino (the one with the ??) is not correct)

 

 

6

I redrew the connections you should have

bendsensor.png

I know I am not a graphic designer. :P The freehand arcs mean that there is no connection between the wires that are crossed.

7

Yeah, I used the bottom

Yeah, I used the bottom drawing and it works fine but I tried the same way to connect up to 2 but the second sensor doesn’t work. ??? means the question how do I connect them. I am gonna try birdmum’s drawing tonight. (I think that’s how I use last night.)

8

Thanks birdmum. This is

Thanks birdmum. This is clear image! I think that’s how I use but a bit mass wires last night. I will do it again with cleaner wires after work today.

9

Dame! stupid me!! After I

Dame! stupid me!! After I clean the mess wires I figure I connect the red wire on A1 at GND…

Everythig works fine now! Thanks for all you guys!!!