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MXS control june 28, 2010

Gwynneth Davidoff, Kendall Pletcher, Mary Schmidt, Amy Whitcombe. MXS control june 28, 2010. Progress. Pulse-width modulation PWM issues: Able to control PWM without GUI, but it didn’t work later Looking at time lag between ASCII file input and DAC output

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MXS control june 28, 2010

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  1. Gwynneth Davidoff, Kendall Pletcher, Mary Schmidt, Amy Whitcombe MXS controljune28, 2010

  2. Progress • Pulse-width modulation • PWM issues: Able to control PWM without GUI, but it didn’t work later • Looking at time lag between ASCII file input and DAC output • Appears to be a limiting threshold for updating information (~12 ms) • Reduced to 4 ms when print statements were removed • Connecting PWM and DAC output • Thinking of using a relay to switch between two voltages on a DAC, triggered by the PWM output from the PIC

  3. Questions to ask Keith • What is the frequency range you would be looking to drive PWM signals with? • How quickly do you want the ASCII file to be able to control voltages? (Right now, we are limited to a response rate of 3 ms, but we are looking into ways of improving it) • Regarding HK: Do you want to know the current and voltage going into the DC-DC converters, or just current?

  4. Next steps • Today/weekend • Continue to debug GUI/PIC connection • Make circuit to connect PWM and DAC output • Continuously updating GUI • Next week • Anything of the above that isn’t finished • Testing with MXS (“should be in the mail [yesterday]”) • Once we solidify the system we want: PCB layout, components box design

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