ESP-12 Relay Board Strange Behavior

Moderators: grovkillen, Stuntteam, TD-er

Post Reply
Message
Author
rmhoutz
Normal user
Posts: 36
Joined: 08 Sep 2017, 14:09

ESP-12 Relay Board Strange Behavior

#1 Post by rmhoutz » 09 Dec 2020, 20:11

Friends

I have a ESP Relay board from electrodragon.com https://www.electrodragon.com/product/w ... d-esp8266/
Image
I'm running firmware build 20111 - Mega
I'm attempting to add momentary switches to the available GPIO pins and turn the relay's on or off.
The problem I have is the GPIO pins don't act the same even if configured the same.
I don't know if this is a software problem or hardware problem so I'm hoping you guys can help.
For example I setup a input switch with Internal PullUP on GPIO-15 and momentary switch across it and 3.3v
When I press the button I see the pin pulled high as seen in the log. SW : GPIO=15 State=1 Output value=1
But I can't get GPIO-4 or GPIO-5 to show any kind of state change.
Here is the schematic. As far as I can tell GPIO15 and GPIO4 or 5 should work the same as they are directly connected to the header pin.
Image
Any help or advice is greatly appreciated.

rmhoutz
Normal user
Posts: 36
Joined: 08 Sep 2017, 14:09

Re: ESP-12 Relay Board Strange Behavior

#2 Post by rmhoutz » 10 Dec 2020, 03:44

I just figured out the labeling on this relay board is not correct. The Pin labeled as GPIO5 is actually connected to the ESP on GPIO4. The header pin labeled as GPIO5 is actually connected to ESP GPIO4. In simpler terms they are labeled backwards.

I'm still confused as to what determines if the default pin mode is a input or output and if it's normally high or low.
Last edited by rmhoutz on 10 Dec 2020, 22:30, edited 1 time in total.

TD-er
Core team member
Posts: 5520
Joined: 01 Sep 2017, 22:13
Location: the Netherlands
Contact:

Re: ESP-12 Relay Board Strange Behavior

#3 Post by TD-er » 10 Dec 2020, 10:37

Some of those default states may be determined by pull-up resistors on the board which are needed to boot the ESP into the correct mode.
For example GPIO-0 and 2 MUST be pulled up at boot and GPIO-15 MUST be pulled down at boot.
See also this page and the links on it: https://espeasy.readthedocs.io/en/lates ... on-esp8266

Whether a pin is input or output may be determined by the task/plugin using the pin.
You can also set a boot state on the Hardware tab in the web interface.
But those are set by ESPEasy, so it will be set after the ESP is booted and ESPEasy starts.
Those settings only can activate internal pull-up resistors (and on GPIO-16 a pull-down), which have a resistance of 50k - 100k, so they are quite weak.

rmhoutz
Normal user
Posts: 36
Joined: 08 Sep 2017, 14:09

Re: ESP-12 Relay Board Strange Behavior

#4 Post by rmhoutz » 10 Dec 2020, 22:38

Thanks TD-er
That was a big part of my confusion the header pin GPIO15 I was trying to use would change it's state on boot.
I was avoiding using GPIO header 4 and 5 because the mislabeling was confusing me also. Now that I figured out it was simply a swap of the labeling everything is working as I expected it to.

Thanks again for your input.

TD-er
Core team member
Posts: 5520
Joined: 01 Sep 2017, 22:13
Location: the Netherlands
Contact:

Re: ESP-12 Relay Board Strange Behavior

#5 Post by TD-er » 10 Dec 2020, 22:52

You're welcome.

Maybe you can post some image here with the correct GPIO pins, in case someone else ends up on this topic with the same problem.

rmhoutz
Normal user
Posts: 36
Joined: 08 Sep 2017, 14:09

Re: ESP-12 Relay Board Strange Behavior

#6 Post by rmhoutz » 16 Apr 2021, 15:26

Hi TD-er

I'm trying to find a place on the web to host my image so it can be viewed here. Do you have a place I can do that?

User avatar
Ath
Normal user
Posts: 1160
Joined: 10 Jun 2018, 12:06
Location: NL

Re: ESP-12 Relay Board Strange Behavior

#7 Post by Ath » 16 Apr 2021, 15:34

rmhoutz wrote: 16 Apr 2021, 15:26 I'm trying to find a place on the web to host my image so it can be viewed here. Do you have a place I can do that?
You can attach images and other (.zip) files to each post, in the Attachments tab, below the area where you are typing your message.
/Ton

rmhoutz
Normal user
Posts: 36
Joined: 08 Sep 2017, 14:09

Re: ESP-12 Relay Board Strange Behavior

#8 Post by rmhoutz » 16 Apr 2021, 16:46

Attention anyone that purchased this device
ESP_Relay_Board_SPDT_01.jpg
ESP_Relay_Board_SPDT_01.jpg (86.53 KiB) Viewed 4352 times
from ElectroDragon should verify the connection of GPIO4 and GPIO5 (labeled as IO4 and IO5) using a continuity tester as the labeling on the board could be wrong.
ESP8266-ESP-12E-chip-pinout-gpio-pin.png
ESP8266-ESP-12E-chip-pinout-gpio-pin.png (27.67 KiB) Viewed 4352 times

Post Reply

Who is online

Users browsing this forum: No registered users and 22 guests