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Lab1 of CENG4480

Lab1 of CENG4480. CSE CUHK Lecture: Terrence Mak TA: Zong Wen. Objectives. 1. Learn to use mbed chip 2. Try to use accelerometer ADXL332. Scores. 1. Show me your system works A) Print the input voltage on the serial port terminal B) Calculate and print the tilt

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Lab1 of CENG4480

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  1. Lab1 of CENG4480 CSE CUHK Lecture: Terrence Mak TA: Zong Wen

  2. Objectives • 1. Learn to use mbed chip • 2. Try to use accelerometer ADXL332

  3. Scores • 1. Show me your system works • A) Print the input voltage on the serial port terminal • B) Calculate and print the tilt • 2. Hand in the answers of the questions in the lab manual

  4. ADXL332 introduction • Description: The ADXL322 is a small, thin, low power, complete, dual-axis accelerometer with signal conditioned voltage outputs, which are all on a single monolithic IC. The product measures acceleration with a full-scale range of ±2 g(typical). It can also measure both dynamic acceleration (vibration) and static acceleration (gravity).

  5. ADXL332 introduction • Function block diagram

  6. Printing the voltage while(1) { tempX= X_axis * 3.3; tempY = Y_axis * 3.3; //print current temp printf("X = %5.2F ; Y = %5.2F \n\r", tempX, tempY); wait(.5); }

  7. The voltage-tilt curve

  8. Operational Amplifier • For ideal op-amps there are two very important rules to remember about inverting amplifiers, these are: "no current flows into the input terminal" and that "V1 equals V2", (in real world op-amps both of these rules are broken).

  9. From voltage to angle • Imagine vmin, v0 and vmax are the value of voltages we get at -90, 0, and +90 degree. • Inversely we can get the angle with this formula • A = asin( 2*(v – v0)/(vmax – vmin))

  10. Deadline • Before Oct. 3 6:00 PM

  11. Contact information • Office 1005 HSH Engineering Building • Email: wzong@cse.cuhk.edu.hk • Mobile: 59886697

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