Power Bare Onion Board?
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@Lazar-Demin: I was powering 3V3 and grounding both GND, but RST was floated. I'll try grounding it and see what happens. Thanks!
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I use the two upper right pins shown in the diagram: https://wiki.onion.io/Documentation/Hardware/Pinout-Diagram#omega-pinout-diagram. Works
% if the time!
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@Janus-Sanders: but also pull-down on RST, right?
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@Dave-M No. No pull down on RST is necessary. Just 3.3v on the correct terminals. This should only be done as a test and not soldered without the proper design.
I should mention, the Omega needs at least 100mah to run so make sure your power source has plenty of juice!
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@Janus-Sanders Huh, weird. I clipped on 3.3V with an ammeter (I was trying to see what the draw was). The board drew ~200mA and my 3.3V was solid (didn't dip) but the light never started blinking and the board didn't connect to WiFi. I guess I'll try again this weekend...
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@Dave-M yeah, strange. You're right about the 200mah's also. Does the Omega have surge protection? I've always switched power into the onion. Perhaps the direct battery to contact surge is getting in the way?
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I tried this yesterday with no success.
I supplied 3.3V to the Omega through an MCP-3302E which should have provided the correct 3.3v and up to 250 mA, which should be sufficient? Any issues with this?
There's some conflicting information in this thread, is there a definitive list of the minimum connections?
There are two RST pins, RSt and FW RST, do they both have to be connected to GND?
Do I have to connect both GND pins?
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I feel an explanation is in order. My Onion projects are designed to be portable and modular. I connect the Onion using the Adafruit LiPo Charger . This is the circuitry used to power the Onion with 3.3-volts, including connecting both grounds (from the charger) in the overall application. I wouldn't connect power directly without protection of some kind. I apologize if my comments were misleading. Also, the RST-GND (in a powered circuit) will reset or re-flash the Onion OS so a push button should be used for this feature and is not necessary for normal operation.
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@Janus-Sanders good idea, i must grab a bunch of those lipo chargers myself.
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@youlian-troyanov the link above was based on older designs. Consider Adafruit's PowerBoost products. (I'm not a salesman btw
)
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@Janus-Sanders cool, thanx
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@Janus-Sanders Looking at this again. The Powerboost boards seem to output 5V, but the Omega runs at 3.3V. What am I missing?
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@youlian-troyanov you're not missing anything. The confusion is in the specifics of my design. I using the Omega mini dock and powering the unit through it's mini USB port (5 vdc) eliminating a lot of custom wiring, cabling or converters :slight_smile:
