Search found 47 matches

by human890209
Fri May 17, 2019 8:52 am
Forum: ESP32 Arduino
Topic: How to Save core dump to flash and read it by espcoredump.py
Replies: 0
Views: 89

How to Save core dump to flash and read it by espcoredump.py

Hi, I'm using ESP32 Arduino. I got a crash reboot lately and I couldn't reproduce it. But I realy want to find out if the cause is a hardware(power) failure or a software bug. My ESP32 is working alone, not monitored by a PC serial monitor. I think connecting a PC is not possible for my case, I'm te...
by human890209
Sat Apr 13, 2019 4:24 am
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Re: Help! ESP32 burnt by Motor Drive Module.

I understand now. Thanks.
by human890209
Fri Apr 12, 2019 10:02 am
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Re: Help! ESP32 burnt by Motor Drive Module.

its possible. Another option to try on a new motor driver board to help is to put a 100 or 220 Ohm resistor in series with your 2 control wires and PWM wire to your driver board. Thanks. I will try that. Could you tell me the physics theory of the small resistor? Do they protect the ESP32 from shor...
by human890209
Tue Apr 09, 2019 11:08 am
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Re: Help! ESP32 burnt by Motor Drive Module.

I connect the L9110s Drive board directly to my 7.2v Battery(8.4v) to test. L9110s can handle 12V in its datasheet. Test about 3 minutes, the MPU and PS2Controller are good, but something wrong with the PWM controlling and my ESP32 is very hot. I disconnect the power immediately to save my ESP32. I ...
by human890209
Tue Apr 09, 2019 12:09 am
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Re: Help! ESP32 burnt by Motor Drive Module.

I have used this one, may not be what your looking for but it could prove out the issue because it has opto Isolators as inputs to protect your device. https://www.amazon.com/gp/product/B078TDKC4F/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1 Thanks. This one seems to be a much bigger one. If I add a...
by human890209
Mon Apr 08, 2019 2:11 pm
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Re: Help! ESP32 burnt by Motor Drive Module.

There is something that does not make sense here. I have done exactly the same thing as you. Not using the exact same parts mind you. But basically the same motor driver and motor. I never had a issue when I would reverse the motor direction. The control lines and PWM signal are input only to the m...
by human890209
Mon Apr 08, 2019 1:05 am
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Re: Help! ESP32 burnt by Motor Drive Module.

More test, I narrow the error down to the power source and the motor. I got 4 N20 motors in hand, 2 are 300 rpm and the other 2 is 200rpm. I measure the electric resistance of them. One 300 rpm motor is 5.8Ω, the other motors are around 10.8~12.8Ω which explains why this 5.8Ω one is the fastest and ...
by human890209
Mon Apr 08, 2019 12:53 am
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Re: Help! ESP32 burnt by Motor Drive Module.

What would be more helpful it is give links to the exact modules you are using. And also what pins you have connected to them. ESP32 Mini Kit: https://www.aliexpress.com/item/MH-ET-LIVE-ESP32-MINI-KIT-WiFi-Bluetooth-Internet-of-Things-development-board-based-ESP8266-Fully/32819107932.html L9110s Du...
by human890209
Sun Apr 07, 2019 10:31 am
Forum: General Discussion
Topic: Help! ESP32 burnt by Motor Drive Module.
Replies: 13
Views: 941

Help! ESP32 burnt by Motor Drive Module.

Hi, my dev board is MH-ET ESP32 Mini Kit. I got issues by using PWM driving 2 N20 Motors(1:50, 6V). I've found that sometimes my robot reboot when the motor start or change its direction. So I make a simple programme to reproduce the error. Something like Blink Example, change 2 N20 Motor direction ...
by human890209
Fri Apr 05, 2019 10:08 am
Forum: ESP32 Arduino
Topic: Questions about Pull-up/Pull-down and PWM
Replies: 1
Views: 205

Questions about Pull-up/Pull-down and PWM

Hi, I noticed there are pull-ups resistors on the L9110s x2 Motor Drive Module. And lately, I got a tiny L9110s Motor board which doesn't have the pull-ups. And I read the data-sheet of L9110s chips. No pull-ups in the example circuit. I'm generating the PWM by ledcWrite() and sigmaDeltaWrite() and ...

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