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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.
This feature is discussed in detail at the end. Connections are pretty easy. Start by placing the accelerometer on to your breadboard.
This can be done by connecting the 3. Try the sketch out, before we begin its detailed breakdown. 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. Instead of calling analogRead function, we are calling ReadAxis custom function. This function merely takes 10 sample of ADC conversions and returns the average. 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. For example, When the sensor outputs 0 volts on x-axis i. When the sensor outputs 3. When the sensor outputs 1. The term Ratiometric will make more sense now as the output voltage increases linearly with acceleration over the range.
ST self-test pin on the module controls this feature. When ST pin is connected to 3. The resulting movement of the beam allows the user to test if the accelerometer is functional. Warning: Exposing the ST pin to voltages greater than 3.
How Accelerometer works? Interface ADXL335 with Arduino
Breadboard 6. Accelerometers are devices that measure acceleration, which is the rate of change of the velocity of an object. A single G-force for us here on planet Earth is equivalent to 9. Accelerometers are useful for sensing vibrations in systems or for orientation applications. By measuring the amount of acceleration due to gravity, an accelerometer can figure out the angle it is tilted at with respect to the earth. By sensing the amount of dynamic acceleration, the accelerometer can find out how fast and in what direction the device is moving.
ADXL335 ACCELEROMETER PDF
Model Package Pins Temp. Please adxl35 the datasheet for more information. The model is currently being produced, and generally available for purchase and sampling. At least one model within this product family is in production and available for purchase.
Acceleration Measurement with Accelerometer ADXL335 & Arduino