Custom Omega 2 Expansion Dock. Need feedback
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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.
