Please give better instructions on connecting bare encoders. about ai-esp32-rotary-encoder

[om-hb]

For anybody who is finding this issue while searching for an explanation on how to connect a bare encoder.

This should be the way it's done:

(Original Picture from: https://www.robotics.org.za/EC11-VS-15)

[john-]

Thanks for posting this.

Based on random references I found I wound up doing things a bit different and things seem to work fine. Specifically:

C -> 3.3v (not ground)
No pull up (or down) resistors for A/B

Do the pull up/down resistors on A/B add some robustness?

[om-hb]

Thanks for posting this.

Based on random references I found I wound up doing things a bit different and things seem to work fine. Specifically:

C -> 3.3v (not ground)
No pull up (or down) resistors for A/B

Do the pull up/down resistors on A/B add some robustness?

To be honest, I probably don't know more than you do - I also just figured it out by googling. 😅 However, on the rotary encoder modules that you can buy pre-assembled, they seem to use resistors for A/B, so I figured they will probably have a reason to do so. 😄

[john-]

I found another example that includes RC circuit to assist with debouncing:

https://www.electroschematics.com/rotary-encoder-arduino/

Direct link to schematic:

https://www.electroschematics.com/wp-content/uploads/2015/06/rotary-encoder-arduino-wiring.png?resize=305%2C183?w=305

This one does not include wiring of the switch but other examples cover that.

[igorantolic]

Answered by community

[rin67630]

Just to avoid mistakes: the schematic posted by om-hb on 12 Jun does not work with that library.
I just have tested this wiring and can confirm that it does not work.

The contacts a and b must go to 3V Vcc and the (optional) resistors must be pull-down.

For the push switch its just the other logic the contact must go to GND and the input have pull up to Vcc.

[john-]

Just to avoid mistakes: the schematic posted by om-hb on 12 Jun does not work with that library.

Do you mean this library (ai-esp32-rotary-encoder) ?

I just have tested this wiring and can confirm that it does not work.

The contacts a and b must go to 3V Vcc and the (optional) resistors must be pull-down.

Did you mean to say say the contact C must go to VCC?

[om-hb]

Just to avoid mistakes: the schematic posted by om-hb on 12 Jun does not work with that library.
I just have tested this wiring and can confirm that it does not work.

The contacts a and b must go to 3V Vcc and the (optional) resistors must be pull-down.

For the push switch its just the other logic the contact must go to GND and the input have pull up to Vcc.

I just disassemble my project to double-check: Maybe I'm missing something, I'm confused or there are differences between the encoders, but for me that schematic seems to work just fine!