Name of the exercise

Pico Board - Hall Effect Measurement

Responsible for the exercise

Dan Octavian Savu, Ozgur Cobanoglu, Jean-Cristophe Garnier, Niko Neufeld

Description of the exercise

Although designed as a very simple board for children, picoboard can be used as a real data acquisition board to gather data such as intensity of light (optical fibers), magnetic field (hall effect) or resistance measurement. Before any data measurement a calibration phase is needed. This exercise has the purpose to present one way that a hardware card (such as picoboard) can be interfaced with students programs (writen in C/Python/etc) and also how they can do real measurements with the software and hardware they have.

What will the students learn

- how to measure the hall effect using a very simple data acquision board
- resistance calibration
- how to read data (resistance measurement) using a serial interface from the scratch board
- sensor data visualisation

Duration

1 hour

List of material

- adapted scratch board
- USB cable
- hall probe
- magnet
- custom board for hall probe, scratch board, ruler, magnet

Relevant information

http://www.sypris.com/test-and-measurement/magnetics-fw-bell/hall-effect-sensors
http://www.adc9001.com/index.php?src=03-three-axis-hall-probe
http://www.picocricket.com/picoboard.html
http://info.scratch.mit.edu/About_Scratch
http://info.scratch.mit.edu/Sensor_Board
http://scratch.mit.edu/

Documentation

  • hall_sensor_schematic.jpg:
    hall_sensor_schematic.jpg

Template for "Resistance Calibration"

Template for "Hall Effect"

Python API for Scratch Board

Topic attachments
I Attachment History Action Size Date Who Comment
Texttxt A_pico.py.txt r1 manage 4.3 K 2010-01-19 - 23:09 DanSavu Picoboard class (A)
Texttxt A_resistance_calibration.py.txt r1 manage 2.5 K 2010-01-19 - 23:09 DanSavu Resistance calibration python template
Texttxt B_hall_probe.py.txt r1 manage 2.7 K 2010-01-19 - 23:10 DanSavu Hall probe python template
Texttxt B_pico.py.txt r1 manage 4.3 K 2010-01-19 - 23:10 DanSavu Picoboard class (B)
PDFpdf Microntroller_datasheet.pdf r1 manage 1917.8 K 2010-01-19 - 23:05 DanSavu Microcontroller datasheet
PDFpdf OperationalAmplifier_LM324.pdf r1 manage 529.9 K 2010-01-19 - 23:06 DanSavu Operational Amplifier datasheet
PDFpdf Picoboard_protocol.pdf r1 manage 499.8 K 2010-01-19 - 23:07 DanSavu Picoboard protocol
PDFpdf Picoboard_schematics.pdf r1 manage 106.5 K 2010-01-19 - 23:07 DanSavu Picoboard schematics
JPEGjpg hall_sensor_schematic.jpg r1 manage 24.5 K 2010-01-19 - 23:03 DanSavu  
Texttxt scratchboard.py.txt r1 manage 3.4 K 2009-10-07 - 00:42 DanSavu Scratch Board - Python API for accessing sensor values
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Topic revision: r2 - 2010-01-19 - DanSavu
 
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