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Feather Huzzah w tpl5111 not restarting
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Feather Huzzah w tpl5111 not restarting

by brettwpeters on Sun Aug 18, 2019 11:39 am

I'm trying to integrate a tpl5111 into a project based on the code here: https://learn.adafruit.com/adafruit-tpl ... kout/usage .

The problem i'm having is that when ever the tpl5111 tries to power on after the alloted delay believe it's getting a premature "done signal" and powering off (grounding EN) immediately. I'm not able to use gpio5 as its being used for an ads1115. I've tried all the other gpio pins and have the same issue. If I disconnect the done pin connection the tpl5111 lets the system come out of sleep and run the code (of course it never stops at since the done pin is disconnected). I've also noticed that if I hit the reset button on the tpl5111 quickly I can not initiate a "on" cycle (premature done signal), however if i hold it for a half a second its able to run the program...I assume this is because I'm un-grounding the EN long enough for the program to get to the "digitalWrite(DONEPIN, LOW);" portion of the code.

any suggestions would be greatly appreciated.

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Mon Aug 19, 2019 2:07 pm

bump. After lots of trouble shooting I'm pretty sure the issue is that I'm getting a brief "HIGH" signal from the GPIO (i've tried all of them and hae smae issue) when the feather wakes up. I tried connecting a 2k resistor from the GPIO to ground to hold it LOW until its supposed to go LOW but that doesn't seem to help. thanks in advance for the help.

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Mon Aug 19, 2019 4:16 pm

also, the tpl5111 seems to function just the same even when the vdd pin on it is totally disconnected...that doesn't seem right....

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Tue Aug 20, 2019 9:56 am

adafruit support? Help?

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Re: Feather Huzzah w tpl5111 not restarting

by adafruit_support_carter on Tue Aug 20, 2019 4:47 pm

also, the tpl5111 seems to function just the same even when the vdd pin on it is totally disconnected

That does seem odd. Can you post a photo of your setup showing how you have everything wired together.

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Wed Aug 21, 2019 9:34 am

Here a pic: https://photos.app.goo.gl/T5LRUexNhCvYdAa26

Here's how everything is connected:
Huzzah Feather:
EN: to Enout on TPL
USB: to VDD on TPL
GPIO15: to Done on TPL
3v: To Voltage Divider
A0: Reads Voltage Divider
GND: To Ground

For the TPL:
VDD: to USB on Huzzah
GND: To Ground
ENout: to EN on Huzzah
Done: to GPIO15 on Huzzah
Delay: to 30k resistor to ground (trace cut on back)

What I've found: If I disconnect the VDD (from the USB pin on the huzzah), the TPL will continue to operate and turn on by pressing the button on it (the green LED is dim). If I test for voltage between the vdd pin and grd (when disconnected from huzzah) I get a voltage of approx 4 v which quickly drops to >0.5v in approx 15 seconds once I begin testing voltage . The voltage between VDD and ground it doesn't drop until you put a multimeter on it and once you drop it doesn't "recharge" unless you briefly touch it with the lead from the USB (4v).

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Re: Feather Huzzah w tpl5111 not restarting

by adafruit_support_carter on Thu Aug 22, 2019 1:19 pm

Does your breadboard have split power rails? The TPL and ADS are covering where the break would be. Look for a break in the red/blue lines running down the board.

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Fri Aug 23, 2019 9:24 am

no, it does not. They are continuous.

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Re: Feather Huzzah w tpl5111 not restarting

by adafruit_support_carter on Fri Aug 23, 2019 1:49 pm

Switch VDD to 3V on the Feather to match the logic level:
https://learn.adafruit.com/adafruit-tpl ... r-pins-2-3
and see if you can recreate the original issue:
The problem i'm having is that when ever the tpl5111 tries to power on after the alloted delay believe it's getting a premature "done signal" and powering off (grounding EN) immediately.

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Fri Aug 23, 2019 4:33 pm

If I connect to 3v the tpl doesn't turn on at all even when i push the button. I think this is because there is no voltage on the 3v pin when the en pin is pulled low. VDD to usb pin is what is shown at https://learn.adafruit.com/adafruit-tpl ... kout/usage. thanks

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Re: Feather Huzzah w tpl5111 not restarting

by adafruit_support_carter on Fri Aug 23, 2019 6:08 pm

Inlining setup for reference:
setup.jpg
setup.jpg (410.11 KiB) Viewed 67 times

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Re: Feather Huzzah w tpl5111 not restarting

by adafruit_support_carter on Fri Aug 23, 2019 6:12 pm

Good point on the setup. You're pretty much doing same as guide. And, yah, it is a bit of chicken/egg with what I suggested - how do you power the thing from the thing that disconnects power from the thing??!!

Let's try and rule out soldering. Some of the pins appear to be possibly cold solder and not wetted out, like VDD on the ADC board and the DELAY pin on the TPL:
solder.jpg
solder.jpg (26.43 KiB) Viewed 67 times


Can you post a photo showing the solder on the backside of the Feather also.

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Wed Sep 04, 2019 1:03 pm

sorry for the delay I was out of town for a week. I re-soldered the connections and still have the same issue. Here is a pic of my poor soldering skills: https://photos.app.goo.gl/f2qbTcknDCMicp4U9

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Re: Feather Huzzah w tpl5111 not restarting

by adafruit_support_carter on Mon Sep 09, 2019 3:07 pm

Oops, sorry for delay. Soldering still looks a little iffy, but maybe good enough. Also, the soldering on the Feather headers would matter as well.

Let's try starting over a bit. Redo your breadboard setup per the guide:
https://learn.adafruit.com/adafruit-tpl ... kout/usage
Except that you have external resistors instead of using the trim pot. Also, just don't use the ADS for now so that pin 5 is available.

Do you have any NeoPixels so we can also run the example as is?

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Re: Feather Huzzah w tpl5111 not restarting

by brettwpeters on Mon Sep 09, 2019 4:47 pm

I switched to pin 5 for the donepin and it works! Is there anyway to hook up the ads to pins other than 5 and 4? thanks!

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Please be positive and constructive with your questions and comments.