Thursday, March 3, 2011

Analog to Digital

Some grade 12s are working with the 2 BASIC Stamp modules I have in my class. The 3rd group is working with an Arduino Duo. Both groups are experimenting with Analog to Digital conversion. The Ardiuno Examples-Analog lab made a good start. Adding my DSO Nano oscilloscope meant they could see exactly what PWM means and why the LED could be dimmed from 0 to 100%. On the Stamp the other groups were using an RC circuit to measure the value of a variable resistor. The Stamp even has a built in in RCTIME function to pull this off. This RC time method works well but I started looking for the analog inputs and discovered the Stamp has none! Christopher Vecchio's web page shows a good work-around for the Stamp.
Arduino Analog Inputs - 6
Stamp Analog Inputs - 0
Score one for Arduino!

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