Ever wondered how your smartphone knows up from down! They all got a tiny device called Accelerometer built into the circuitry which can sense when you tilt it from side to side. The brilliant scientist Isaac Newton in his second law of motion defined acceleration by relating it to mass and force. In other words, acceleration is the amount of force we need to move each unit of mass.

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Ever wondered how your smartphone knows up from down! They all got a tiny device called Accelerometer built into the circuitry which can sense when you tilt it from side to side. The brilliant scientist Isaac Newton in his second law of motion defined acceleration by relating it to mass and force.

In other words, acceleration is the amount of force we need to move each unit of mass. Suppose, the cube is in outer-space where everything is in weightless state, the ball will simply float in the middle of the cube. If we suddenly move the box to the left with acceleration 1g A single G-force 1g is equivalent to gravitational acceleration 9.

If we measure the force that the ball applies to the wall X, we can get an output value of 1g on the X axis. The ball will simply fall on the wall Z and will apply a force of 1g, as shown in the picture below:. This is because the gravitational force is pulling the ball down with force 1g.

The accelerometer measures the static acceleration of gravity in tilt-sensing applications as well as dynamic acceleration resulting from motion, shock, or vibration. This structure is suspended by polysilicon springs. It allows the structure to deflect at the time when the acceleration is applied on the particular axis. Due to deflection the capacitance between fixed plates and plates attached to the suspended structure is changed. This change in capacitance is proportional to the acceleration on that axis.

It can measure the static acceleration due to gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration. The sensor works on power between 1. However, an on-board 3. This breadboard friendly board breaks out every pin of the ADXL to a 6-pin, 0.

This includes 3 analog outputs for X, Y and Z axis measurements, 2 supply pins and a self-test pin which allows you to check the functioning of the sensor in the final application.

The analog outputs are Ratiometric , meaning 0g measurement output is nominally equal to half of the 3. VCC pin provides power for the accelerometer which can be connected to 5V on the Arduino. X-Out pin outputs analog voltage proportional to acceleration exerted on X axis.

Y-Out pin outputs analog voltage proportional to acceleration exerted on Y axis. Z-Out pin outputs analog voltage proportional to acceleration exerted on Z axis. ST Self-Test pin controls the self-test feature. This feature is discussed in detail at the end. Now that we have a complete understanding of how ADXL accelerometer works, we can begin hooking it up to our Arduino. Connections are pretty easy. Start by placing the accelerometer on to your breadboard.

This can be done by connecting the 3. The sketch is pretty simple. Try the sketch out, before we begin its detailed breakdown. Following image shows the accelerometer output on serial monitor at different positions. Next, we define the minimum and maximum values the Arduino is going provide. The variable sampleSize tells the Arduino to take 10 samples of each conversion to get more precise results. Except this, we initialize serial communications with the PC. In setup function, we read analog outputs from the sensor every ms.

Instead of calling analogRead function, we are calling ReadAxis custom function. This function merely takes 10 sample of ADC conversions and returns the average. The following code snippet is the most important part of the program. It maps and converts the analog output voltages from the sensor to gravitational acceleration G.

So, when we call map xRaw, RawMin, RawMax, , , value of RawMin would get mapped to , a value of RawMax to and values in-between to values in-between. The values and are not arbitrary. The term Ratiometric will make more sense now as the output voltage increases linearly with acceleration over the range. The ADXL Accelerometer has a self-test feature which allows you to check the functioning of the sensor in the final application.

When ST pin is connected to 3. The resulting movement of the beam allows the user to test if the accelerometer is functional. How Accelerometer works? What is Acceleration? Operating Voltage 1. Warning: Exposing the ST pin to voltages greater than 3.

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3 Axis Accelerometer with Regulator – ADXL335

The ADXL is a small, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. It can measure the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration. Different manufacturers use a different voltage regulator IC. The ADXL is a small, thin, low power, complete 3-axis accelerometer with signal conditioned voltage outputs.

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SparkFun Triple Axis Accelerometer Breakout - ADXL335

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How Accelerometer works? Interface ADXL335 with Arduino

The ADXL is a small, thin, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. It can measure the static acceleration of gravity in tiltsensing applications, as well as dynamic acceleration resulting from motion, shock, or vibration. Bandwidths can be selected to suit the application, with a range of 0. At least one model within this product family is in production and available for purchase.