Problem with Hornbill ESP32 dev (Brownout detector was triggered)

guntumuduguvivek
Posts: 5
Joined: Tue Aug 22, 2017 12:13 pm

Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby guntumuduguvivek » Tue Aug 22, 2017 12:23 pm

1. When i tried with Wifiscan example with Arduino-esp32 code library, i feel board is keep on resetting.
I have checked with USB cable, it was working fine.
Output screen was attached below.
Can anyone help me out, what might be the problem with dev board.
Attachments
esp32err.jpg
Arduino output from COM port
esp32err.jpg (118 KiB) Viewed 8260 times
Last edited by guntumuduguvivek on Wed Aug 23, 2017 8:19 am, edited 1 time in total.

ESP_Sprite
Posts: 3621
Joined: Thu Nov 26, 2015 4:08 am

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby ESP_Sprite » Wed Aug 23, 2017 1:45 am

This is most likely a power supply issue. My guess is that you're running this from USB? Can you try another USB power source and/or a different USB cable?

guntumuduguvivek
Posts: 5
Joined: Tue Aug 22, 2017 12:13 pm

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby guntumuduguvivek » Wed Aug 23, 2017 8:15 am

yes, I am using USB. I have tried with different USB cables, no change.
I have also tried with Strapping pins setup given in datasheet, still no change.

Please help.
Attachments
strapping pins.jpg
strapping pins.jpg (109.27 KiB) Viewed 8221 times

ESP_Sprite
Posts: 3621
Joined: Thu Nov 26, 2015 4:08 am

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby ESP_Sprite » Thu Aug 24, 2017 3:07 am

The strapping isn't the issue here. The brownout detector specifically triggers if the ESP32 sees a too low voltage on its power supply lines. Can you measure what the actual voltage of the 5V and 3.3V power supply lines on the board is?

guntumuduguvivek
Posts: 5
Joined: Tue Aug 22, 2017 12:13 pm

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby guntumuduguvivek » Thu Aug 24, 2017 6:30 am

In 5V point = 3.45V
In 3.3V point = 3.27V

ESP_Sprite
Posts: 3621
Joined: Thu Nov 26, 2015 4:08 am

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby ESP_Sprite » Thu Aug 24, 2017 10:35 am

3.45V? That is very, very low, and usually indicative of a power supply issue (as in: USB connector, USB cable, laptop/power brick/powerbank). You'd expect 4.5V at the very least there, and even that can lead to trouble.

guntumuduguvivek
Posts: 5
Joined: Tue Aug 22, 2017 12:13 pm

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby guntumuduguvivek » Thu Sep 07, 2017 9:12 am

Thank you ESP_Sprite for suggestions. I have given external 5V supply to the Module, working perfectly alright.

jimthree
Posts: 2
Joined: Sat Oct 07, 2017 1:34 pm

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby jimthree » Sat Oct 07, 2017 1:38 pm

I have exactly the same problem on my two new hornbills. When powered from USB, the 5v line measures about 3.5v and triggers the brownout detector. I've tried with many different cables and USB chargers (some rated as high as 3.2A) but nothing makes a difference.I've contacted the manufacturer to see what they say, but it's a bit crap if they need external power to reach a steady 5v.

linuxpaul
Posts: 42
Joined: Thu Jul 20, 2017 6:10 pm

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby linuxpaul » Sun Oct 08, 2017 7:50 pm

I use an Elko 220uF/16V between 3.3V and GND to supress the peek when wifi is powering up.

:)
linuxpaul

jimthree
Posts: 2
Joined: Sat Oct 07, 2017 1:34 pm

Re: Problem with Hornbill ESP32 dev (Brownout detector was triggered)

Postby jimthree » Sat May 19, 2018 7:16 pm

I just want to second what /u/linuxpaul said, I have now strapped a 220uF cap across 3.3v and Gnd and it works fine. no more brownouts.

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