Arduino Code:

SparkFun Inventor’s Kit for Arduino

Example sketch 09

FLEX SENSOR

In the previous sketch, we learned how to command a servo to

a new sensor, and use it to control the servo.

When the strip is straight, the coating will be a certain

get further apart, increasing the resistance. You can use this

animals, etc. See http://www.sparkfun.com/tutorials/270 for

Hardware connections:

The flex sensor is the plastic strip with black stripes.

The flex sensor has two pins, and since it’s a resistor,

Connect one of the pins to ANALOG IN pin 0 on the Arduino.

black orange) to GND.

Servo:

Because the cable ends in a socket, you can use jumper wires

jumper wires directly into the socket.

Connect the WHITE wire (signal) to digital pin 9

Note that servos can use a lot of power, which can cause your

servos or many of them, it’s best to provide them with their

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1239464763

with lots of help from the Arduino community.

Visit http://learn.sparkfun.com/products/2 for SIK information.

Version 2.0 6/2012 MDG

// Include the servo library to add servo-control functions:

// Create a servo “object”, called servo1. Each servo object

Servo servo1;

const int flexpin = 0;

{

Serial.begin(9600);

servo1.attach(9);

void loop()

int flexposition; // Input value from the analog pin.

// Read the position of the flex sensor (0 to 1023):

// Because the voltage divider circuit only returns a portion

// to the servo’s range of 0 to 180 degrees. The flex sensors

servoposition = map(flexposition, 400, 1023, 0, 180);

// Now we’ll command the servo to move to that position:

// Because every flex sensor has a slightly different resistance,

// output. To help tune our program, we’ll use the serial port to

Serial.print(“sensor: “);

// Note that all of the above lines are “print” except for the

// same line, then sends a final carriage return to move to

// After you upload the sketch, turn on the serial monitor

// You’ll be able to see the sensor values. Bend the flex sensor

// 600 and 900 in the map() function above, you’ll exactly match

// the flex sensor’s range with the servo’s range.

delay(20); // wait 20ms between servo updates