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Progress on PWM Control Issues and Next Steps for DAC Integration

The team has made progress in controlling PWM without a GUI, although recent issues have emerged, particularly with the time lag between ASCII file input and DAC output, which appears to have a limiting threshold of approximately 12 ms. This has been reduced to 4 ms by removing print statements. We are considering using a relay for switching voltages on the DAC, triggered by PWM signals. Key questions are being prepared for consultation with Keith regarding frequency ranges and control responsiveness. Immediate next steps involve debugging and circuit connections, aiming for system solidification and PCB layout plans.

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Progress on PWM Control Issues and Next Steps for DAC Integration

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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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