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PowerBoost 1000c pulling low voltages
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PowerBoost 1000c pulling low voltages

by WickedWind on Wed Jun 26, 2019 11:05 am

Hello there,

I'm putting together a PiGrrl style project using a Pi 3b+

So far so good, I've reached the point where I'm doing final tests to close it up but unfortunately having power troubles.

Namely, the PowerBoost 1000c and 3.7v LiPo battery combo seems to be unable to properly boot the hardware alone - I've thrown a multimeter on it and can't seem to get more than 3.8v out of it.

Oddly enough, when I plug in the wall-socket power (5.1v 2.5a) that will come up to about 4.8v - just enough for the Pi to boot with a low voltage warning.

While it was booted like this I ran up retropi and went through the button config - all the buttons seemed to detect just fine, which seems to indicate there's no short action going on there at least. Also ran it up outside of the case on the off chance a screw was shorting on a bit of solder or something.

At this point I'm hoping to get some help, if possible - briefly went over similar threads, and re-soldered all the power and ground connections just in case but with no luck...

For reference, the configuration as it currently stands:
01_1000c_config.jpg
01_1000c_config.jpg (124.73 KiB) Viewed 274 times

02_SPDT_Switch.jpg
02_SPDT_Switch.jpg (57.51 KiB) Viewed 274 times

03_Gamepad_PCB_Connetions.jpg
03_Gamepad_PCB_Connetions.jpg (87.63 KiB) Viewed 274 times

WickedWind
 
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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Wed Jun 26, 2019 11:07 am

As a follow up, the behaviour when powered on:
04_Powered_On_1.jpg
04_Powered_On_1.jpg (132.3 KiB) Viewed 273 times

05_Powered_On_2.jpg
05_Powered_On_2.jpg (134.77 KiB) Viewed 273 times


If there's anything I can clarify or check please let me know - have also tried reseating the Pi onto the TFT GPIO pins and removed/refitted the ribbon cable in case they were dodgy. also removed the audio jack cable for giggles just in case.

WickedWind
 
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Re: PowerBoost 1000c pulling low voltages

by adafruit_support_mike on Fri Jun 28, 2019 1:20 am

Do you have anything else connected to the RasPi?

The PowerBoost 1000C has a hard upper limit of 1.1A @ 5V. Any higher current load can kill the load-sharing circuit in the MCP73871 LiPo charger.

When all four cores are running, a Pi3B+ can come close to the limit all by itself. If you have other devices connected that use more than trivial current, the demand could exceed what the PowerBoost can supply.

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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Fri Jun 28, 2019 6:40 am

adafruit_support_mike wrote:Do you have anything else connected to the RasPi?.


Mike, thanks for taking the time to look into this.

The only other attachment is a 2.8" PiTFT plus. Power runs to it via the PiGrrl gamepad

Haven't thrown anything in the USB ports, I also don't have a speaker attached having opted to just run a small 3.5m male/female aux cable to the outside of the shell for headphones.

I suspected the wire I'm using to run the power might be too puny for this, but I'm no expert.

I'll pull the ribbon cable of the PiTFT and detach it from the Pi, and throw the ribbon on the Pi to take the screen out of the equation and come back with results...if you happen to think of anything else, please let me know!

~ Edit - did some brief digging and according to this mad scientist he managed to get the 3b+ up to 700mA going flat stick, and from another Adafruit forum thread it seems like about 100mA for the TFT...so I can see what you mean about pushing the 1000c
Last edited by WickedWind on Fri Jun 28, 2019 7:09 am, edited 1 time in total.

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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Fri Jun 28, 2019 7:00 am

Unfortunately no luck upon removing the TFT from the mix - same behaviour as when fully assembled, intermittent power light. Had the HDMI in just to see if there was any output, was getting the 'out of range' message from the monitor not liking the resolution after throwing the TFT drivers at it, but I'm taking it that means the pi was briefly operational at those intervals.

For reference, sans TFT with power light behaviour:
Pi_Sans_TFT_1.jpg
Pi_Sans_TFT_1.jpg (62.2 KiB) Viewed 244 times

Pi_Sans_TFT_2.jpg
Pi_Sans_TFT_2.jpg (56.67 KiB) Viewed 244 times

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Re: PowerBoost 1000c pulling low voltages

by adafruit_support_mike on Sat Jun 29, 2019 1:40 am

The jumpers you're using might be a bit light.

There's an easy way to check: measure the voltage from one end of the wire to the other. If the wires are too small, you'll see a noticable drop in voltage simply due to the wire resistance.

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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Wed Jul 03, 2019 5:26 am

adafruit_support_mike wrote:The jumpers you're using might be a bit light.

There's an easy way to check: measure the voltage from one end of the wire to the other. If the wires are too small, you'll see a noticable drop in voltage simply due to the wire resistance.


Thanks Mike, I'll try this out asap and come back with the results

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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Sat Jul 06, 2019 3:35 am

And I'm back, no luck yet :(

Decided to simplify things a bit and do the following:

* Desolder all connections from the 1000c
* ONLY Solder up the Enable/Ground pins to the switch. I also used a .5mm cable for this up from the thinner ones - according to the .pdf for the 1000c the En point doesn't actually haul any thing high voltage and is just used as a control switch, but at least doing so helps rule out bad wiring/unnoticed but bad soldering work.

As a result, copped 3.95V out on the 5v pin:
01_Battery.jpg
01_Battery.jpg (46.6 KiB) Viewed 150 times


Also for reference, the battery (3.5v 2400mAh LiPo) Which I've made sure was fully charged before commencing this (green light on 1000c etc)
02_Battery.jpg
02_Battery.jpg (62.34 KiB) Viewed 150 times


At this point, I'm not sure what I can do next? Am I right in my thinking that I should be getting ~5.2V via the 1000c with a 3.7V battery attached? Just...double checking to make sure I haven't misinterpreted anything.

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Re: PowerBoost 1000c pulling low voltages

by adafruit_support_mike on Sun Jul 07, 2019 1:17 am

Yes, the PowerBoost should produce about 5.2V output when running from a charged LiPo and no load is connected.

It sounds like the PowerBoost has sustained some damage. When did you get it?

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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Tue Jul 09, 2019 6:24 am

I've had it since late May/Early June - it sat in it's bubble wrap for a few weeks after that while I got the 3D printing, painting of the case and the rest of the system assembled just running on the original Pi power supply (making sure it ran up without portable power so I didn't close it up only to find I'd butchered it).

It wasn't in any unusual conditions, mild Australian autumn in a nice dry desk. It's first use was charging the battery up propped up on a little spacer to make sure it didn't get too hot, and then came the assembly.

If it seems like it's DOA (happy to defer to your recommendation on this) I'll go ahead and contact the supplier and get the ball rolling on an exchange

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Re: PowerBoost 1000c pulling low voltages

by adafruit_support_mike on Tue Jul 09, 2019 6:57 pm

It could be an early component failure, or damage from running without a LiPo.

Go ahead and check with the reseller to see if they’ll do a replacement. I’m afraid it’s past our 30-day return/replace period.

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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Wed Jul 10, 2019 7:26 am

Thanks Mike, no worries, I'll send it their way as they have a longer warranty period.

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Re: PowerBoost 1000c pulling low voltages

by WickedWind on Fri Aug 09, 2019 6:50 am

Mike, thanks for your patience and help on this.

The unit was indeed faulty and has been replaced, new one works like a charm!

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Re: PowerBoost 1000c pulling low voltages

by adafruit_support_mike on Fri Aug 09, 2019 11:19 pm

Glad to hear it's working for you. Happy hacking!

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Please be positive and constructive with your questions and comments.