ADM00768

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ADM00768 is an evaluation board for sensors that combines the Analog Devices Inc. (ADI) ADXL345 three-axis digital accelerometer together with several other components. This board is designed to help designers of portable electronic products assess the performance of the ADXL345 and other components they may have selected to develop motion sensing applications.

Applications

This evaluation board offers several possible applications such as gesture-controlled user interfaces, gaming peripherals, navigation equipment, and fitness/ health monitors. As an example, designers may use the accelerometer to create an interactive interface for controlling a system connected to a monitor or television.

The evaluation board also features connectors that can be utilized for the construction of a variety of motion sensors. These sensors are capable of communicating with devices such as mobile phones, computers, and PDAs in order to transmit user input. The board can also be used to monitor the position and movement of nearby individuals.

Working Principle

The working principle of the ADM00768 evaluation board begins with the ADXL345 which collects data from an external stimulus such as a user’s finger tapping or a mechanical action. The data is relayed to the analog signal-conditioning circuitry which has an amplifier and a low-pass filter for noise cancellation. The filtered signal is further manipulated by nearby operational amplifiers (OPAMPs) to change the converter signal gain and eliminate offset-voltage errors. The OPAmp’s output is then further manipulated by a 6-bit analog-to-digital converter and then stored in a 4kbit serial EEPROM.

The evaluation board also includes several additional components such as a microcontroller, a temperature sensor, and digital switches. The EEPROM is used to store non-volatile parameters such as device settings, measurement data, and calibration information. The microcontroller is responsible for processing the digitally encoded data from the analog converter and the EEPROM. Lastly, the temperature sensor is used to facilitate temperature compensation of the measurements.

The ADM00768 evaluation board also enables the user to communicate with it using various protocols such as USB, I2C, and SPI. Using this feature, the user can record data such as acceleration and pressure information in order to quickly diagnose system performance. Additionally, the evaluation board can be integrated into existing design environments.

The ADM00768 evaluation board is an advanced sensor testing tool that enables designers to quickly assess the performance of their selection of components. With a wide range of possible applications and connections, the ADM00768 is a versatile and cost-effective solution for creating motion-sensing products.

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