The LD1117S33 (if authentic) needs minimum of input 0.1uF and output 10uF capacitors.
Also, do not use thin power supply wires. I recommend minimum of 22 Ga.
Okay, I added 47uF and 220uF capacitors to my circuit (on Vin and Vout of the LD1117 respectively) and swapped all the wires for 22 gauge. And... it works! Boots up completely and was able to setup wifi through web config and so on. Thank you!
Omega2 requires solid 3.3V stable voltage output at 300mA.
And one more critical spec... power supply needs to be able to handle in-rush current during WiFi power-up without voltage drop.
That fleabay $0.99 item needs a large capacitor (I recommend 220uF 6.3V) on its input side and a large capacitor on its output side (I recommend 470uF 6.3V.) The link between that unit and Omega 2 cannot be too thin gauge (I recommend 22 ga) and definitely use soldering as opposed to using DuPoint connectors.
That seems highly implausible, as the MT7688 isn't really designed for battery operated systems.
What you should probably do is use a microcontroller intended for ultra low power / sleep mode / wake on interrupt operation.
Have that occasionally power up the MT7688 (USB power switch, regulator with enable, etc) when it needs wifi. Make sure you either have no persistent file system state, or do an orderly shutdown each time.
Also consider if there may be another wifi solution that is a better fit for your application.
Info seems to be inconsistent and probably due to different designs from various manufacturers.
Also LiFePO4 is so new thus no long term stability report.
One thing that seems to be true is it does not have the same problem as Li-Ion/Li-Po (Li-Cobalt) as it has gas swelling problem -- and dead, when fully depleted.
I've seen one factory recommendation:
do not deplete below 2V and never go below 1.5v (as has potential to shorten the number of recharge cycles/usable life.)
i decided to start building my boards this weekend. maybe someone can guide me on the regulator, the board print states cj1117 3.3v regulator. a search brings the news that this reg. is no longer produced. fine, no biggie, i went for an aws1117 3.3v , however, although it is, according to pictures on the net, the same body style. the spacings on the board are too small and the female header prevents the single , i guess ground leg on one side from a proper positioning on the pads.
can anyone who has finished building this board suggest a regulator that is 3.3v 1amp and can fit ok on the pads? thanks
My omega 2+ led was continuously blinking while booting.
Hence , I decided to power it off.
When I decided to power it on again , it does not power on.
I checked the expansion docks power pins using an arduino , it works well.
I will appreciate any ideas.
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