Abstract: This paper first briefly introduces the dual-axis acceleration sensor ADXL202E, then elaborates on its design method for slope measurement in a wireless sensor network, and provides a design example of slope measurement in a wireless sensor network. Keywords: Wireless sensor network; Acceleration sensor; Slope measurement ; ADXL202E [ b ][align=center]A design of slope measurement based on the wireless sensor network Liang Dongdong, Wei Lifeng, HU SHUANG[/align][/b] Therefore, slope measurement is of great significance as an application in wireless sensor networks. This paper uses ADXL202E as the sensor for slope measurement. ADXL202E is a low-power, fully functional dual-axis accelerometer produced by Analog Devices (ADI) and is very suitable for wireless sensor networks. Based on wireless sensor networks, this paper applies ADXL202E to slope measurement and presents a typical system design. 1 Introduction to ADXL202E 1.1 Features of ADXL202E ADXL202E is a low-cost, low-power, fully functional dual-axis accelerometer with a measurement range of ±2g. ADXL202E has the following features: (1) ADXL202E is a single integrated circuit that integrates a dual-axis accelerometer. (2) It can measure both dynamic and static acceleration. (3) It has pulse width duty cycle output. (4) Low power consumption (< 0.6mA). (5) Faster response than electrolyte, mercury, thermal, and slope measurement instruments. (6) The bandwidth of each axis can be adjusted by a capacitor. (7) The resolution is 5mg at a bandwidth of 60Hz. (8) The DC operating voltage is +3V to +5.25V. (9) It can withstand a severe impact of 1000g. 1.2 Measurement Principle The ADXL202E is a complete dual-axis acceleration measurement system based on a single integrated circuit. It is an open-loop acceleration measurement structure that uses a micro-motor sensor and signal control loop with polysilicon as the surface to perform the operation. For each axis, the output loop converts the analog signal into a digital signal with a pulse width duty cycle. These digital signals are directly interfaced with the microprocessor. The ADXL202E can measure positive and negative acceleration, with a maximum measurement range of ±2g. The ADXL202E can also measure static acceleration and can also be used for inclination measurement. The sensor uses a polysilicon structure with surface micromachining on a silicon wafer, supported by elastic elements of polysilicon, which provide the resistance required to balance the acceleration. Structural deflection is measured using a variable capacitor consisting of independent fixed plates and a central plate attached to the moving object. The fixed plates are controlled by each π phase of a square wave. When the accelerometer is subjected to acceleration, the balance of the variable capacitor changes, making the amplitude of the output square wave proportional to the acceleration. Phase demodulation is used to extract information and determine the direction of acceleration. The demodulator output is sent to a pulse width duty cycle demodulator via a 32kΩ fixed resistor. At this point, the user can change the size of the filter capacitor to set the bandwidth of the output signal. This filtering improves measurement accuracy and effectively prevents frequency aliasing. After low-pass filtering, the analog signal is converted from a DCM to a pulse width duty cycle signal. T2 is set within the range of 0.5ms to 10ms using a resistor RSET. The output duty cycle is set to 50% at 0g acceleration. Acceleration can be measured by a counter/timer or a low-power microcontroller by measuring T1 and T2. For details, please click: Design of Incline Measurement System Based on Wireless Sensor Network