Collect DC current/voltage information

[amyeguo]

Hello! I’m an undergraduate student in the Ka Moamoa lab at Northwestern with Josiah Hester, I’m interested in extending JACDAC for the micro:bit to help developers visually debug and understand the energy usage of their programs.

I’m currently trying to import a forked copy of pxt-jacdac as an extension into MakeCode. But when I try to “Add Blocks” for the button2 it runs into this error:

I was wondering if there are any missing steps besides cloning & importing the URL for a forked copy of pxt-jacdac to get the JACDAC extension to work.

Thanks!

[pelikhan]

we typically don't use the online editor to work on the pxt-jacdac project (and sub-projects). instead follow the developer instructions in https://github.com/microsoft/pxt-jacdac#developer-section

May I ask what you are trying to acheive? pxt-jacdac is the core library and it might be easier for you to work by simply referencing it.

[pelikhan]

here's a sample that listens for dc current measurement services

https://codesandbox.io/s/vanilla-jacdac-typescript-forked-pgwhwc?file=/index.ts

The interresting bit is to grab dc services when they get announce and register for each "report_receive" events,.

// listen for new device
bus.on(DEVICE_ANNOUNCE, (device: JDDevice) => {
  log(device.describe());
  // go through all dc_current_measurement services
  const services = device.services({
    serviceClass: SRV_DC_CURRENT_MEASUREMENT
  });
  services.forEach((service) => {
    // grab reading register
    const reading = service.readingRegister;
    // register handler for each receive data entry
    reading.on(REPORT_RECEIVE, () => {
      // read data
      const dc = reading.unpackedValue[0] as number;
      log(`${device}: ${dc}A`);
    });
  });
});

[pelikhan]

there is no simulator support for DC current measurement yet but i could add that

[pelikhan]

I have added support in the simulator for a DC service.

[amyeguo]

Thank you so much! If we were to create a power provider as a JacDac device such as a solar panel, could we profile the DC current/voltage measurement of that device?

[pelikhan]

Once the volutage/current is availabe, you coudl build all kinds of tools around the jacdac client SDK. Including profilers.