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Forum Index : Microcontroller and PC projects : new board from Olimex : another choice for PicoMite HDMI-USB
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| amiga Newbie  Joined: 08/05/2025 Location: BelgiumPosts: 25 |
i all folks, there is a new board for PicoMit cost +/- 25€ .. without tax and transport ! https://www.olimex.com/Products/RaspberryPi/PICO/RP2350pc/open-source-hardware  have nice day or sleepy night, @+ amiga |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 8232 |
I've just been having a look at the circuit - probably one of their better efforts. They've used GP8 for PSRAM select but then lost two of the ADC pins by using them internally anyway. :( Do these people not realize that having the availability of 8 ADC inputs is actually a "big thing" for this sort of board? By all means bring out the battery voltage and external power detect to pins - the user can decide whether or not they need monitoring. The power supply looks like the RPi recommended switcher, I wonder if they've got it right and this thing will overclock? What's the betting that it reaches the RPi spec and not much further? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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javavi Guru Joined: 01/10/2023 Location: UkrainePosts: 517 |
Practice has proven that even homemade boards with RP2040 and RP2350 chips overclock just like the original Pico. It depends more on the specific microcontroller chip and to a greater extent on the flash memory chip, and the power supply must be OK. There are also myths about straight, identical, short tracks on the printed circuit board for HDMI! I have a homemade Murmulator board with crookedly routed HDMI tracks going sideways that works great in all PicoMiteHDMI resolutions, including high ones. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8232 |
he RP2350 is a bit of a red herring as Raspberry Pi only produce a board with the RP2350A on it, not the B version. AFAIK only Peter's design can overclock the RP2350B sufficiently for the DVI displays that the PicoMite uses, and that's only by replacing the switching supply with a linear one, Whether this Olimex board can manage it with a switching regulator is still unknown. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 1581 |
I thought I'd read that the WeAct overclocks reliably? Regardless, I'm sticking with Pete's DIL module  |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8232 |
Your first problem with that one is to find out which one you are talking about! The V1.0 and the V2.0 look the same but are different. Then there's the short one with the dual row pins down each side. Is that the Core? Very confusing. WeAct don't even mention the HSTX pins either. . Edited 2025-07-14 04:36 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| olav Newbie Joined: 05/07/2025 Location: GermanyPosts: 3 |
Has anybody got MMbasic working on this board? I have installed the firmware file PicoMiteHDMIUSBV6.00.03.uf2 on it. It does start and prints a "P" to the top left corner of a connected HMI screen, but then hangs. |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2787 |
Welcome to the forum. Perhaps it is starting to print the PicoMite version info. Have you been able to set up the serial console? If so you can see if it is the Pico that hangs or the HDMI screen not being compatible. Others have had to try different screens to find one that works properly with the DVI-D over HDMI from the Pico. If you don't have the serial console working install the non-USB firmware so you will have the USB console available to diagnose the problem. Later you can install PicoMiteHDMIUSBV6.01.00b15 from the "PicoMite V6.01.00 betas" thread. It has a number of bug fixes. |
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| olav Newbie Joined: 05/07/2025 Location: GermanyPosts: 3 |
Hi, I‘ve got an answer on Github - thank you. I will try to recompile and report back here Edited 2025-09-27 17:16 by olav |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8232 |
Why doesn't it surprise me that it's Olimex? The same company that put audio on two different PWM channels on another board? Crazy pin spacing on another? The CH334 problems? Peculiar HDMI pinouts? I give them points for trying but not for succeeding. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| olav Newbie Joined: 05/07/2025 Location: GermanyPosts: 3 |
I am not affiliated with them, but it certainly seems nice that they sell these boards for reasonable prices (in Europe) and they seem to care about open documentation and community building. I am not aware of a similar board with multiple USB-A sockets Edited 2025-09-28 06:17 by olav |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8232 |
I get used to designing my own boards. :) It's nice to just build in the facilities that I want at the time. Four USB-A sockets is easy enough for me to do now. I've published a couple of designs on this forum now. I'm not saying the Olimex stuff is bad, it's just unfortunate that it's had compatibility problems with MMBasic in the past. It's fine if you are programming in C or Python and can draw on suitable libraries. Note that this applies to a lot of other boards too! MMBasic isn't one of the languages that many board designers test their hardware with. :( However, the demands of MMBasic aren't high or particularly specialised. There are sensible defaults or GPIO pins can be redefined to fit most situations. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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