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BW16 Stamp - Tiny 5GHz WiFi MCU

Super compact functional 5G Hz WiFi MCU in stamp size with power circuit, work out of the box

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Want the best of 5G WiFi connectivity while still maintain super compact form factor? Then this is for you!

The super compact design allows for easy deployment on any kind of DIY platform as all pins are re-mapped to the breadboard-friendly 2.54 pitch castellated holes, and also power regulating circuit already added with a 1.25mm battery connector, once plug in the battery, its ready for deployment!

Don't know what this Ameba board (BW16) is capable of? Watch the short clip below,

To deploy a IoT microcontroller is often a pain as it requires portable power supply and efficient power regulation, and also to work well with most sensor and actuators, the pin pitch has to be breadboard friendly meaning 2.54mm apart from each other. To achieve this, I design this Ameba Stamp module, and it features,

1.  Add power circuit and battery connector to easily provide the power the IC needs

2. Re-map the previously 2mm pitch pins to breadboard-friendly 2.54 pitch pins design so as to better work with other electronic components

Both the schematic and PCB are open-source, and link is here,

https://oshwlab.com/xidameng/amebanano

pcbdoc - 112.79 kB - 01/19/2022 at 09:02

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x-zip-compressed - 8.91 kB - 01/19/2022 at 09:02

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  • 1 × Ameba RTL8720DN (BW16) module

  • [BW16 Stamp] Version 2 is finally out

    SimonXi2 days ago 0 comments

    I have designed a second version of the Ameba Stamp and have renamed it to "BW16 Stamp" which is more intuitive to most makers.

    In the previous log, I have mentioned that I would like to replace the LDO MAS1117 with DCDC convertor to save power from the relatively high quiescent current (2mA) that AMS1117 draws, but after searching for the parts and availablity, it appears that the global chip shortage still persists 😅


    Plus, replacing with DCDC convertor will also introduce many more passive components as compared to LDO, this will result in bigger PCB layout, higher price point and more complex PCB design.

    Therefore, I have done some research and located a new LDO -- RT9013, it works similar to AMS1117 LDO, but it requires much less passive components (only 2 de-coupling capacitors) and much much less quiescent current (≈25uA), which is about 80 times less than AMS1117 LDO.  The footprint of this IC is also much smaller than both the DCDC convertor and AMS1117, the price and availability is also a big bonus,

    The only downside however, is that it is only able to deliver 500mA power at max (AMS1117 delivers 1A), but in the 1 Ohm Resistor Energy Meter project, we have measure and observed that the max instantaneous current drawn from BW16 is around 200mA, so 500mA is good enough for many low power profile projects.

    The schematic is completed

    This is how it looks in 3D rendering,

    The second version will be open sourced later, so stay tuned for more updates~

  • #2 Improvements for 2nd edition

    SimonXi02/11/2022 at 03:25 0 comments

    1. Increase the board width to let the board fit into bread board more easily
    2. Increase the tolerance for the outer half holes so that the machining process will not damage too much of the holes' copper coating 
    3. AMS1117 has too high of the static current drawn and only able to regulate the power when the batter is above 3.3 V, so I am going to replace with the DCDC power IC from RPI Pico as it can handle both high and low input voltage

  • #1 Received the PCB board

    SimonXi02/11/2022 at 03:18 0 comments

    I have just received the PCB board and most seems fine, here is a live demo,

    However, as I am a "stingy" person and do NOT wanna pay $10 just for the castellated holes, my DIY castellated holes does not come with the smoothest finishes, in fact, some of the outer half holes already got the copper layer torn off during the machining, but according to my visual inspection, those are still good to use. 

    Also, I forgot to measure the board width, so at the moment, it's not entirely bread-board friendly, this will be fixed in the next version

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