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Forum Index : Microcontroller and PC projects : WeAct Pico2350B 48-pin Module
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| lizby Guru  Joined: 17/05/2016 Location: United StatesPosts: 3605 |
Ok, here's my first pass at a PCB for this module: $6.15 for 5 from JLCPCB, including shipping and sales tax, no tariff mentioned.   It may well need a V2 (and V3). Gerbers, zipped EasyEDA, & module files attached. It uses an LCD (ILI9341 or ILI9488), a 5-pin RTC module, an SD module, an ESP8285 module, and optionally a VGA connector module. Provision is made for a 4-channel relay module to be plugged in. I don't know which pin is used to address PSRAM. WeAct-RP2350B-48-pins_V1b.zip ~ Edited 2026-02-09 04:11 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1708 |
Can I ask why on the external connector pins you always put 0 and 3.3V next to each other? Not a criticism, just curious because I always thought it best to seperate them, that avoids accidental shorts |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3605 |
On the 3-pin connectors I put 3V3 in the center to prevent reversing of V+ and 0V. On the connectors with more pins, I find that often what I want to plug in has them next to each other (those 1-, 2-, 4-, 6-, 8-channel relay modules). The RTC module has them on opposite ends, so you really don't want to plug it in backwards with the battery on it. The 37-sensor kits typically have data in the center, so YMMV. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8515 |
PSRAM select is on GP0. It is linked via R14 (zero ohm link) so it could probably be changed with careful soldering. There are only 5 possible pins that can be used. I would suggest leaving it as it is. Circuit diagram is Here. Interesting that it uses a crystal rather than a clock module. The regulator is linear. . Edited 2026-02-09 06:50 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3605 |
Thanks for that. GP0 is the only pin I left unconnected (I think), because I had a vague recollection that it was used for something onboard. Thanks also for the link to the schematic. ~ Edited 2026-02-09 07:19 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3605 |
I received the 3 WeAct modules. Nothing soldered on yet, but all the OPTION settings I printed on the PCB were accepted without failure (except that the RTC was flagged as not present). I thought the modules included 16MB PSRAM--but there's none--just a set of 8 pads on the back, one of which is connected to GP0. I've ordered some 8MB PSRAM chips--couldn't find 16MB on Aliex or Amazon.  ~ Edited 2026-02-11 03:57 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| ville56 Guru Joined: 08/06/2022 Location: AustriaPosts: 388 |
If you add the PSRAM, don't forget to also add the pullup for the CS signal. Otherwise you will get unpredictive behavior. I'll post a picture of my module with the pullup if you like. Gerald 73 de OE1HGA, Gerald |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3605 |
Ah, I had missed that wrinkle. Please do post a pic. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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