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Forum Index : Microcontroller and PC projects : Elemento - it's just a tiny bit magic. :)
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 9075 |
The boards (these big ones are faulty):  These are "dry run" pics, obviously, to see if bits will fit. They'll give you an idea of the variations that are possible though:   I've not shown the USB hub as I haven't got one to hand. The RTC module is shown fitted inverted, as originally designed. In theory it just fails to fit inside the case if it plugs in with the battery on top. It could probably be "staked" down solid in some way to make it fit but that would make any access to the SD card socket impossible. Something to consider though, as modifying the RTC module is a bit of a pain. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 9075 |
Having got a bit waylaid by my PC3 adaptations, it's time to get back to Elemento. :) The first prototype on the new boards is now built and is being tested. So far I'm using a sacrificial YD-RP2040 for the tests and things are going well. I've had SD card, RTC and audio working (that's all I've tested so far). The manual is about ready (but some more pictures might help), as is the circuit diagram. I've not got to the point of cutting out the enclosure yet, although there are templates to mark it out. GPIO, USB and VGA to test with the YD-RP2040 before I move on to a RP2350 module to test HDMI. Very encouraging so far. EDIT: USB is working. GPIO pins are correct. Can't find my VGA lead. :( Rookie mistake - reversed the TX and RX connections to the CP2102. :( Edited 2026-08-21 01:01 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 9075 |
I reversed the two green signals on the VGA module but it works perfectly if you swap the resistors over, although the silkscreen is incorrect. HDMI works (although this monitor can be temperamental - that's a known problem that I have to live with until I can justify a replacement). The pins are wrong on the silkscreen though. I've now tested it with the YD-RP2040 at the cheap end and the Pimoroni Plus 2W at the expensive end. The PSRAM is recognised. I was a little surprised that the Plus 2W doesn't have a Heartbeat LED onboard (or any LEDs for that matter). It makes a change. :) I've been pleasantly surprised by the audio. Quality isn't great (it is PWM after all - I couldn't spare another pin for I2S) but there is no noise or CPU hiss at all that I can hear, even listening through headphones. It's fine for making noises. All the problems so far have now, hopefully, been corrected on the design for the 1.3 version. They have also been noted and corrected in the manual. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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IanT Senior Member  Joined: 29/11/2016 Location: United KingdomPosts: 136 |
I've just purchased a Pimoroni Plus 2 (not the W as it was stock out) Mick and I'm still playing with it. There is an onboard LED connected to GP25 but unfortunately no comforting 'blink' to show MMB is ticking over. It's the same pin as a (vanilla) Pico2 I think, so there must be some other difference that I haven't twigged yet... (not unusual) However, everything else seems to be working OK with 6.03 Regards, IanT |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 11776 |
MMBasic doesn't automatically configure the heartbeat for boards with the RB2350B. Try OPTION HEARTBEAT ON |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 9075 |
I found the LED, it's very dim and green so I'd missed it. On the W version it's driven from GP0 on the RM2, not GP25. That accounts for me not seeing a heartbeat LED, I suppose. The RM2 isn't configured in any way. The LED *is* on GP25 on the non-W version. A bit tight of them not to include some header pins, I thought. It's a pretty expensive board. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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