Casio data logger
AWARD - This design has been judged the "best overall" at the Circuit Cellar Ink "Design 98" Contest sponsored by Microchip and Hewlett Packard. |
Alberto Ricci Bitti PIC based Casio Data Logger design
Bring the REAL world inside the Casio!
Now you can interface your Casio to the outside world! Get lots of data
from any kind of sensor, store it in Casio memory, graph it on the built in
display in real time or apply any math function you like.
Do it anywhere, the unit works on batteries. Sophisticated processing, as
regression or statistical analysis, are only a keystroke away. You can zoom,
pan. list your data, or even transfer it to a PC.
V N °C kgm A Hz lux hPa kWh %RH DP | + this project = | |
your real world sensors... | ...and the casio analog interface... | ...means your data easily graphed and analyzed |
The calculator is left untouched, just connect the analog interface to the "program-link" plug on your Casio and start capturing data.
Tech facts:
> reads up to 8 analog inputs at once
> 1 mV resolution, input range from 0 to 4096 mV (12 bits)
> interfaces directly to a huge vaiety of sensors
> battery operated, >200 hour operation from a single 9V battery
> easy programming through the Receive(X) Casio instruction
> easy to build, uses the popular PIC16C84 (16F84)
> fits in a small plastic box as large as the calculator
<> compatible with Casio FX9750 and FX9850, CFX9850
Files available:
my article on circuit cellar ink, issue 99, october 1998
The article covers all the technical details. It includes the schematic and
parts list in case you would build one by yourself.
It also explains the Casio serial protocol and how to make a thermomether from
a temperature sensor.
This is a .PDF file from the Circuit Cellar web site, you need the Adobe
Acrobat reader to view it (download it free from
http://www.adobe.com/)
HTML on-line version of the same article published by EDTN network
click
here to see the complete circuit diagram
same as in the article above (xy_schem.gif, 52kB<)
the PIC16C84 (PIC16F84) XYLOG.zip source code
Fully commented, in official Microchip mnemonics. You need the MPASM
assembler (free from
http://www.microchip.com/) to assemble it.
the PIC16C84(PIC16F84) executable only
errata - please note:
the schematics erroneously connect the led to the positive supply rail,
connect it to the negative rail instead. Thanks to mr. Mark Pepper for
discovering it.
Compatibility & call for testers:
I built the interface to work with a Casio FX9750. Thanks to mr. Paul Denham
that succesfully tested it on its color CFX9850.
It should work unmodified with similar models (e.g. CFX9800) but I have not
tested it. If you have tested it on any new model, please e-mail me. Thanks.
Got a TI8x - TI9x calculator?
Try the Sami Khawam's Texas Instruments PIC interface at
http://www.unet.univie.ac.at/~a9501901/e_index.htm
Teacher's delight
The Casio is immensely popular in schools. In the classroom, this cheap design
lets the Casio capturing data from all kind of experiments. It can make
learning physics, math, natural sciences more fun - and more effective. The
possibilities are endless - let's look at a few examples
- With a torch and a photoresistor, discover the relation between distance and illumination.
- Now use the light sensor to count how many people walks through the beam.
- With two LM35, compare the rise in temperature of two Coke cans - one in
free air and the other in a wool insulation.
- Now place one LM35 in the classroom, and one out of the window. Compare the graphs of the two temperatures over 24 hours.
- Build a force/pressure sensor measuring the resistance between a copper/conductive foam/copper sandwich. Try to linearize it.
Title: Casio data logger
electronic circuit
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 1005
Print version:
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