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Forum Index : Microcontroller and PC projects : An other model of RP2040

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Pluto
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Joined: 09/06/2017
Location: Finland
Posts: 330
Posted: 06:00pm 11 May 2022
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Got today YD-RP2040 made by WWW.VCC-GND.COM from Ali Express.



Notable features of the VCC-GND Studio YD-RP2040 when compared to the Raspberry Pi Pico are:
Power LED
Type-C USB connector    
Reset button (GP24)
User button
WS2812 RGB LED (GP23)
4MB of flash




Tested very briefly. At least I got the WS2814 RGB LED working as expected.
I do not remember that I have seen it on the forum earlier. Price US$5.55 from AliExpress
SZ Aitexm Store. (Price very similar to the cheapest "normal" Picos on Ali E).

Does anyone have experience of this type? Drawbacks compared to "normal" Pico?

/Fred
 
JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3708
Posted: 06:15pm 11 May 2022
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A schematic would be rather useful!

John
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 8674
Posted: 06:15pm 11 May 2022
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  Quote  Drawbacks compared to "normal" Pico?


Not pin compatible - beware
 
lew247

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Joined: 23/12/2015
Location: United Kingdom
Posts: 1676
Posted: 07:12am 12 May 2022
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  matherp said  
Not pin compatible - beware


The only difference is pin 37 is GP23 instead of 3v3_en
and an extra 3.3v pin on the bottom edge of the board next to the SDIO pin



it's now only $4.6o including postage
 
scruss
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Joined: 20/09/2021
Location: Canada
Posts: 83
Posted: 05:44pm 31 Mar 2024
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  JohnS said  A schematic would be rather useful!

John

You ask, we provide (belatedly)!
VCC-GND RP204 Data Page
 
Mixtel90

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Joined: 05/10/2019
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Posts: 6012
Posted: 06:36pm 31 Mar 2024
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I've used the YD-RP2040 for a while. It seems to be a pretty well thought out alternative but you have to be aware of several points:

The WS2812 needs to be enabled via a solder blob link. If you don't enable it then GP23 can be used as an IO pin.

VREF also needs to be enabled via a link. By default the ADC pins are all digital. Alternatively you can also inject your own VREF via a flying lead.

The maximum speed I've managed to clock them is 252MHz. They work fine for VGA.

As the regulator is analogue there is no 3V3EN. That pin is used by GP29.

The supply pins are different. The VBUS diode is always in circuit and VBUS isn't available. This makes it unsuitable for USB systems. The diode goes from the USB VBUS to VOUT'

VIN has another diode to VOUT. It's very good as a standby supply pin.

The USB D+ and D- connections are not available, which also makes it unsuitable for USB systems.

I think that's about it. There is a circuit diagram available.
YD-2040-2022-V1.1-SCH.pdf
I've never had any operational problems with any of mine apart from the speed limitation.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
circuit
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Joined: 10/01/2016
Location: United Kingdom
Posts: 236
Posted: 08:14pm 31 Mar 2024
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Excellent board if the differences work for you - please note the new OPTION (which I have not seen mention of on the forum before); OPTION PICO ON/OFF. (See manual page 83.  This gives access to the now externalised pins on this module.

OPTION PICO ON/OFF
When set to OFF pins GP23, GP24 and GP29 are not set up for normal
Pico use and are immediately available to use. Default ON


There was a useful introduction/discussion about this board back in January here:

https://www.thebackshed.com/forum/ViewTopic.php?TID=15441&P=4

As it is also possible to remove the Heartbeat LED and issue OPTION HEARTBEAT OFF and solder in a small jumper wire to the LED solder pads; and then hop another wire onto the GP24 solder pads as well, a total of 30 I/O connections would appear to be feasible!
Edited 2024-04-01 06:33 by circuit
 
scruss
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Posted: 08:35pm 31 Mar 2024
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  Mixtel90 said  
The maximum speed I've managed to clock them is 252MHz. They work fine for VGA.

Though that's a function of the stepping of the RP2040 chip used, no?
 
Mixtel90

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Posted: 09:35pm 31 Mar 2024
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I don't think so. I suspect it's the speed of the flash chip that they used to keep the cost down. It still exceeds Pico specification so we mustn't grumble too much. :)
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
stanleyella

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Joined: 25/06/2022
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Posted: 10:55pm 31 Mar 2024
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so do we get one or not?
 
bigmik

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Joined: 20/06/2011
Location: Australia
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Posted: 12:19am 01 Apr 2024
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Hi All,

I have been looking at this board (and the purple one) for a while now, mainly as an easy way to access the extra IO pins not normally accessible to a standard Pico.

Using your link I see the price for the 16MB version was down to $3.02AU, albeit the postage was $5.72AU but that doesn’t change at least up to 10 boards.

I decided to buy 5 of them for a grand total of $22.75AU including Aus taxes and postage. Or $4.55AU each, well worth the price to have a bit of a play with them.

I see they use a linear power supply rated at 350mA, I am not sure how hot it would get at that load, maybe it might need some form of heat sink (what could fit that small package?)

I baulked earlier because I was confused by the terminology VIN and Vout, thanks to the PDF schematic that is very plain and I like the concept as I tend to use a 2.1mm barrel jack as the main power source and need to add a diode in series and connect to Vsys to avoid power supply conflicts. This board has that nice dual input diode onboard.

As to maximum speed, looking at the manual (unless mine is outdated) the ‘general’ max clock is 252000, the 378000 does work but not documented so that limitation will not be critical in many applications.

A question, with the 16MB memory will MMBasic automatically detect that and use it or is having that much currently a waste?

Kind Regards,

Mick



.
Edited 2024-04-01 10:19 by bigmik
Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<
 
TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 5961
Posted: 12:57am 01 Apr 2024
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  bigmik said  Hi All,

A question, with the 16MB memory will MMBasic automatically detect that and use it or is having that much currently a waste?

Kind Regards,

Mick


Yes, no waste. You end up with a large A: drive which is the main reason I have a few of them.
Running at 250mHz is good enough for me.

Jim
VK7JH
MMedit   MMBasic Help
 
Mixtel90

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Joined: 05/10/2019
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Posted: 08:33am 01 Apr 2024
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I've been very pleased with them, just using them as a general purpose Pico substitute where 3V3EN and VREF aren't connected. Power into pin 39 as usual.

The main problem now is that you can't easily use them for USB. You can't get 5V out of the USB connector and there's no easy access to the data lines. That doesn't mean that it can't be done though, you could always use a board where the USB-C has a plug in it connected to a USB socket together with a 5V supply. That doesn't work with any of the board designs to date though.

Very cheap for a big(!) A: drive though. Probably useful for log files.

Just watch something else - they are slightly bigger than a Pico. You need to allow slightly more PCB area if designing a board to take either. That extra space is used to good effect though, as the pins are labelled on top of the board. :)
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
stanleyella

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Joined: 25/06/2022
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Posts: 1697
Posted: 05:51pm 01 Apr 2024
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if I plug a usb hub powered 5V into this rpi and usb kb into hub be able to use pico usb?
 
stanleyella

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Posted: 06:09pm 01 Apr 2024
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ordered 5, £11.28 total

 
stanleyella

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Posted: 06:09pm 01 Apr 2024
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ordered 5, £11.28 total

 
Mixtel90

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Posted: 06:44pm 01 Apr 2024
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  Quote  f I plug a usb hub powered 5V into this rpi and usb kb into hub be able to use pico usb?

That might work.

To make it work to USB spec you should really also have a USB lead plugged in that has two 15K resistors from D+ and D- to GND. With this board you can't connect them any closer to the chip but that probably won't matter.

If you are getting the 4M version you may find that they will clock faster than the 16M ones.

Incidentally, the RP2040 stepping number is B0 for the original chips.
B1 has changes to the boot rom on the chip which enhance the floating point routines amongst other things.
There is now a B2 but it's not in my datasheet.
Edited 2024-04-02 04:51 by Mixtel90
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
stanleyella

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Joined: 25/06/2022
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Posts: 1697
Posted: 07:43pm 01 Apr 2024
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another rpi geek moment or a working CHEAP rpi if only for a robot cheaper than arduino nano or lgt nano. it'll be weeks till arriving, hoping it'll work without boring the forum with questions. regards stan
dunno what I ordered, it will be a surprise
what's B? 2l8 now
Edited 2024-04-02 05:50 by stanleyella
 
Mixtel90

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Posted: 08:04pm 01 Apr 2024
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The stepping number is written in tiny characters on the RP2040 chip. Not easy to see!
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
stanleyella

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Joined: 25/06/2022
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Posted: 08:54pm 01 Apr 2024
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  Mixtel90 said  The stepping number is written in tiny characters on the RP2040 chip. Not easy to see!

just what I need with my falcon like eyes :(
serious, it's new and looks interesting. ads look the same if different devices. see in a few weeks. why everything costs more to Australia than uk?
 
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