Espruino on E73-2G4M04S-52832

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  • Hi folks, I just got my hands on this very low-cost module and now eagerly awaiting some sweet breakout PCB's from Oshpark. Initially was going to tinker around with this and Arduino but decided to look into Espruino!

    I am relatively new in electronics and would like some direction. My assumption is that other than physical layout, the process of flashing espruino on this board would be similar to the official MDBT42Q boards?

    pin P.00/XL1 is not listed on the module (E73-2G4M04S-52832) official website, and there are pins labeled DEC2, DEC3 that aren't listed on MDBT42Q , are these pins the same pins but labeled differently? How could I replicate the function of this pin on a E73-2G4M04S module?

    Official page:­ews.aspx?id=243
    Datasheet (PDF):­d=243

    Thank you!

  • I imagine you can just program it the same way as any nRF52 with the SWD/SCLK pins.

    It looks like P00/01 aren't available because there is an on-module low-speed oscillator, which is quite a nice addition (you'd have to build your own firmware to take advantage of that though). DEC2/3 are for the switching power supply, but that's actually not such a big deal and I'd just leave it off.

    Just to add though, looking at the price you may find the Raytac MDBT42Q is actually the same price or cheaper - and obviously firmware for it 'just works' :)

  • Thank you! Will have to look into building a custom fw, what’s the level of difficulty?

    I have a Raytac module too, these just came in at $3/module on a promotion - was hard to pass up.

  • It's not hard really (especially if you're running or have access to a Linux machine) - details here:­b/master/

    There are plenty of threads here on tweaking the build for different things as well.

  • Thank you for the guidance kind Sir!

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Espruino on E73-2G4M04S-52832

Posted by Avatar for user92454 @user92454