Custom Omega 2 Expansion Dock. Need feedback
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Hello Good People,
I have received 3 Omega 2 recently, I am planning to create my own custom dock.
Here are my target features:- Both USB Male A and Micro USB connectors (select one via SMD solder jumpers)
- CH340G for serial communication with Omega 2.
- HM-11 serial module for BLE capabilities, serial communication via RX1 and TX1 line of Omega 2.
- Reset button for Omega 2.
- RGB LEDs.
I need feedback on the schematic whether the connections I have made is correct or not.
(The Board is work in progress!)Let me know if I have missed out anything. Will share the schematic and board in GitHub once it is done.
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hello, it looks ok to me however i am not an electrical engineer familiar with omega2 circuits. i'll say just be patient since this forum has become rather quiet recently. good luck on the project, the male usb seems unique and interesting for omega2 board project. i hope you succeed cause i would like to build one when board is ready.
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This post is deleted!
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@Kamil-Rasulov
Zoom Out (Ctrl+-) and click Enter tags here... at the bottom of the browser's page.@Vijayenthiran-Subramaniam Sorry for this OFF.
Nice project. USB host port usually is a female A.
Good luck!
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@György-Farkas Thanks. The male USB A is not connected to the Omega 2 D+ and D- rather it is connected to the CH340G (the USB to serial converter).
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@György-Farkas said in [Custom Omega 2 Expansion Dock. Need feedback]>
@Vijayenthiran-Subramaniam Sorry for this OFF.
Nice project. USB host port usually is a female A.
Good luck!Nice project, but I would second @Vijayenthiran-Subramaniam - male USB A won't work because the Omega2 USB is a host port, and can't be run in device mode (see me raising the question here and @Chris-Stratton providing a definitive answer here)
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AMS1117 3.3v output side need at least a 10uF 6.3V capacitor. If possible, leave an empty space near Omega2's power supply input power pins to fit a large eletrolytic cap, say 470uF 6.3V. (size: 8mm diameter, height: 5mm.)
ccs_hello
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There is insufficient data on MT7688's IO current source and current sink capability.
I'd say the general practice is (when driving a LED), use current sink method.
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@ccs-hello Thanks a lot for the advice. So I should connect the common pin of the RGB LED to the Vcc and the individual pins to the omega-2 gpios, right?
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@Vijayenthiran-Subramaniam said in Custom Omega 2 Expansion Dock. Need feedback:
@ccs-hello Thanks a lot for the advice. So I should connect the common pin of the RGB LED to the Vcc and the individual pins to the omega-2 gpios, right?
Yes
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I am worried if the current size (60mm X 50mm) will put too much pressure on the USB Male A connector
. Any idea how much Omega 2 weighs?
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@Vijayenthiran-Subramaniam said in Custom Omega 2 Expansion Dock. Need feedback:
The male USB A is not connected to the Omega 2 D+ and D- rather it is connected to the CH340G (the USB to serial converter).
Oops! I missed this.
If I were you I would use that micro USB for the serial console and a female USB A for Omega's USB host port.
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@luz I absolutely agree with you (on USB host port only - of course
).
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@György-Farkas I am having both USB Male A and Micro USB for serial console. User can select any one port through SMD solder jumper. I am trying to make the board more flexible so that the user can use it for multiple purposes. Like,
- Use it as USB to Serial breakout board
- BLE via serial.
- 5v and 3.3v supply.
- Onion breakout of course.
I am still thinking about the omega USB host port. Will update here regularly.
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Just finished v0.1. Let me know what you guys think:
Board dimension: 57mm X 39mm.
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And it is live. More details coming soon.
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Just an update.
If anyone is interested in buying this expansion board: Tindie Link
Documentation is available here: Github Link
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My only recommendation is to not use the HM-11 modules. I used them and found that there is a better alternative that provides more flexibility, though slightly higher priced you can get an FCC certified WSM-BL241-ADA-008 module which is part of the NRF52 series and put an Arduino core in it with a BLE to serial code. Then you can use the Arduino for other things and even use other BLE profiles other than Serial link. The NRF52 core to Arduino has been ported over pretty well other than low power mode which you dont need attached to the Onion because its not battery powered...
Just my 2 cents and what I am building
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@Vijayenthiran-Subramaniam said in Custom Omega 2 Expansion Dock. Need feedback:
Just an update.
If anyone is interested in buying this expansion board: Tindie Link
Documentation is available here: Github Link
hi, looks interesting. I read that there is a new version coming but there was no date on that notice so my question is, do you have a new version coming or is this current board the new version you mentioned? thanks.
