V2 ESP32 dev board compatible with; M5stack, Stemma, OLED

[samuk]

The latest version of this research moved here

Very rough sketch of CERN licenced ESP32 board in 5cm x 5cm M5stack dimensions.

• 8x servo for a walking otto as Robo8080 documents
• 5v input via JST
• Optional HCS404 staggered pins
• Optional M5 Mbus
• Optional staggered 7pin display 1.44
• Optional 3v Stemma Supports Qwiic, Grove (I2C) ,Gravity

Use cases might include:

Rosmo https://rosmo.io

Rosmo with micro servo Driven just by Open Core and 2x continuous rotation micro servo instead of BLDC. These could fit in the existing BLDC socket with a 3d printed adaptor

Otto DIY

Otto Ninja is 4cm x 4cm internally

Notes Nice 'snap' proto board here

Breakout garden style pins

1.44" & 1.8 Sureno fit in footprint ST7735 https://www.aliexpress.com/item/32913241143.html supported 29.70x43.36(mm) http://www.lcdwiki.com/1.44inch_SPI_Module_ST7735S_SKU:MSP1443

1 | VCC | 5V/3.3V power input -- | -- | -- 2 | GND | Ground 3 | CS | LCD chip select signal, low level enable 4 | RESET | LCD reset signal, low level reset 5 | A0 | LCD register / data selection signal,high level: register, low level: data 6 | SDA | SPI bus write data signal 7 | SCK | SPI bus clock signal 8 | LED | Backlight control, high level lighting,if not controlled, connect 3.3V always bright

[runger1101001]

In my mind, this mixes up different concepts:

• in m5 stack, there are cores and modules. the open-core is a core, but the servo and sonar stuff should be on a module.
• on the other hand if you want a minimal cost board for robots, then we could drop the m5 stack support (which complicates things and costs $$$) and make a specific board for that. But honestly I see this niche well served by a huge host of cheap boards available on AliExpress, see designs like Osmo, Zerobot etc...

Putting it all together runs the risk of producing some kind of franken-core, not properly compatible with m5 concepts, but also not ideal as a basic robot board

[samuk]

I take your point.

It's driven by interest from @ottodiy. If we can support their use case well then they might help with the distribution/ development of the board. I guess I hope it could be a board that sees you through a robotics journey

1) Get a Rosmo/ Otto wheeled moving about on continuous micro servo & Blockly 2) Invest a bit more & make a walking Otto 3) invest a bit more and plug in some grove stuff 4) Invest a bit more and add an official M5 stack motor driver 5) Invest a bit more Add a RosmoESC(s) to give better motor control 6) Invest a bit more and get a proto board, do some soldering 7) Fry the board with your dodgy soldering, get a proper M5 core instead :)

[runger1101001]

Ah, I see! I'll make the observation that Ottos head looks a bit like an m5 stack in shape... :-)