Lolin Motor 2.0 + D1 mini

[Clem2105]

Hello everybody!

I bought a Wemos D1 mini and a Motor Shield V2.0.0 (Lolin)
Aliexpress link: https://nl.aliexpress.com/item/32700182142.html

I flashed the Wemos with EspEasy, but in my I2C search I can't find any devices.
When I add a devices with the base address 0x30 nothing works.

With you ever had the problem?
And do you have a solution to solve the problem?

My shield is placed directly on the Wemos (Welded).

Thank you!

[Ath]

Hi,

A few questions:
- What .bin file did you install?
- What does the I2C scan say, a list with just an address, without a description, or that no I2C devices are found?
- Did you leave the I2C configuration on its default settings?
- Did you do the soldering yourself? Are all pins properly soldered, & checked with a multimeter?

[Clem2105]

- What .bin file did you install?
I used this file: ESP_Easy_mega_20210223_normal_ESP8266_4M1M.bin

- What does the I2C scan say, a list with just an address, without a description, or that no I2C devices are found?
No I2C device is found

- Did you leave the I2C configuration on its default settings?
Yes I left everything by default

- Did you do the soldering yourself? Are all pins properly soldered, & checked with a multimeter?
Yes the welds are ok, I tested the GND, 3.3V, 5V and it's ok. For SDA AND SCL how to check them with a multimeter?

[Ath]

- Did you do the soldering yourself? Are all pins properly soldered, & checked with a multimeter?
Yes the welds are ok, I tested the GND, 3.3V, 5V and it's ok. For SDA AND SCL how to check them with a multimeter?

You could check if the GPIO pins involved are actually connected from 1 board to the other. Best to do that would be when the unit is not powered, and use the connection-test or ohms measurement of the meter (the low voltage used there is IMHO harmless).

[TD-er]

Maybe also add either another I2C board to it to see if that one can be found and those boards often have internal pull-up resistors present.
If you have them laying around, try adding 2 resistors of 10k between:
- 3v3 and SDA
- 3v3 and SCL

Value is not that critical. Somewhere between 3k3 and 12k would work I guess.
Also double check to see which pins are set to be used for I2C in the ESPEasy configuration (Hardware tab in web config page of the ESP)

[Clem2105]

Thanks for your quick responses,

I checked all my welds and redone them, I had a fault in the connectors, there was a bad contact.

I think it's ok, I'm doing tests with an engine I'll keep you informed!
Thank you so much!