# Easy first sketch for ADXL 335 analog accelerometer

**URL:** <https://forum.arduino.cc/t/easy-first-sketch-for-adxl-335-analog-accelerometer/70573>\
**Category:** Showcase\
**Created:** [September 2, 2011, 5:25pm UTC](https://forum.arduino.cc/t/easy-first-sketch-for-adxl-335-analog-accelerometer/70573 "2011-09-02T17:25:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [September 2, 2011, 5:25pm UTC](https://forum.arduino.cc/t/easy-first-sketch-for-adxl-335-analog-accelerometer/70573/1 "2011-09-02T17:25:05Z")

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I'm quite new to this....bought the Arduino last fall but had to put it down for a while [wife and I had a baby]. So when the baby naps, I get to scratch my head and learn this stuff. So for you rookies out there, here is any easy sketch to use an analog 3 axis accelerometer. I'm using the ADXL335

> /\* Here's a try at making the signal from the accelerometer control the output of a RGB Led  
> Pin req. - Three pins for Led [output] PWM pins
> 
> - three to read the axes of the ADX [input] Analog pins  
> The Circuit:  
> RGB Led grounded with a 220 ohm resistor
> - red lead to pin 11
> - green lead to pin 10
> - blue lead to pin 9
> 
> ADXL335 acclerometer hooked to ground and 3.3 V
> 
> - X axis to pin A0
> - Z axis to pin A1
> - Y axis to pin A2  
> \*/
> 
> const int redLedPin = 11;  
> const int greenLedPin = 10;  
> const int blueLedPin = 9;
> 
> const int xAxis = A0; //red axis  
> const int yAxis = A1; //green axis  
> const int zAxis = A2; //blue axis
> 
> int sensorX =0;  
> int sensorY =0;  
> int sensorZ =0;
> 
> void **setup** () {  
> **Serial**.begin(9600);
> 
> pinMode (redLedPin, OUTPUT);  
> pinMode (greenLedPin, OUTPUT);  
> pinMode (blueLedPin, OUTPUT);
> 
> pinMode (xAxis, INPUT);  
> pinMode (yAxis, INPUT);  
> pinMode (zAxis, INPUT);  
> }
> 
> void **loop** (){
> 
> sensorX = analogRead (xAxis); // read the accelerometer  
> sensorY = analogRead (yAxis);  
> sensorZ = analogRead (zAxis);  
> sensorX = constrain (sensorX, 261, 399); // keep the numbers within a range so it doesn't take huge  
> sensorY = constrain (sensorY, 261, 399); // jolts to get bright colors  
> sensorZ = constrain (sensorZ, 264, 400); // the values returned for resting rotation through the range of motion are  
> // X [266-400] Y [263-395] z [264-395] so 395 is 1g
> 
> sensorX = map (sensorX, 260, 400, 100, 240); // analogWrite wants values from 0 - 255  
> sensorY = map (sensorY, 260, 400, 100, 255); // so this keeps the values returned by analogRead (sensorXYZ)  
> sensorZ = map (sensorZ, 263, 401, 100, 255); // from rolling over and making weird flashes
> 
> **Serial**.print(sensorX, DEC ); // this is unnecessary to the operation of the code  
> **Serial**.print("\t"); // but it helps to figure out which colors are responding.  
> **Serial**.print(sensorY, DEC );  
> **Serial**.print("\t");  
> **Serial**.println(sensorZ, DEC );
> 
> analogWrite (redLedPin, sensorX);  
> analogWrite (greenLedPin, sensorY);  
> analogWrite (blueLedPin, sensorZ);  
> delay (20); // don't know if I need this, just trying to  
> } //get rid of some jitter

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 6, 2021, 12:31pm UTC](https://forum.arduino.cc/t/easy-first-sketch-for-adxl-335-analog-accelerometer/70573/2 "2021-05-06T12:31:16Z")

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