Generic esp8266 does not set i2c pins for ESP01

[keremers]

Basic Infos

• [ ] This issue complies with the issue POLICY doc.
• [X] I have read the documentation at readthedocs and the issue is not addressed there.
• [X] I have tested that the issue is present in current master branch (aka latest git).
• [X] I have searched the issue tracker for a similar issue.
• [ ] If there is a stack dump, I have decoded it.
• [x] I have filled out all fields below.

Platform

• Hardware: [ESP-01]
• Core Version: [3.0.2]
• Development Env: [Arduino IDE 2.0.4]
• Operating System: [Windows]

Settings in IDE

• Module: [Generic ESP8266 Module]
• Flash Mode: [qio]
• Flash Size: [1MB]
• lwip Variant: [v2 Lower Memory]
• Reset Method: [nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz]
• Upload Using: [SERIAL]
• Upload Speed: [115200] (serial upload only)

Problem Description

the library does not set i2c pins for ESP-01 correctly. It comes with default 4 SDA/5 SCK which ESP01 is missing. It should set them GP2 and GP0.

MCVE Sketch

#include <Arduino.h>

void setup() {
.
.
// requires manual initialization
Wire.begin (2,0);
.
.
}

void loop() {

}

Debug Messages

Debug messages go here

[d-a-v]

The default (sda,scl)=(4,5) choice is historical and it is not advised to change them now. Sadly, there is no esp01 in the available board list. What can be proposed is to add a new board variant (= a new board esp01 or esp01s or both) with proper documentation. Would you be keen to make such a proposal ?

Changes would happen there where you can amend the board list displayed in the IDE and allow selecting the matching variant. Its include files would go to variants/esp01/.

[enjoyneering]

I often use ESP-01 with AHT10 in my projects and they work OK if SDA is on GPIO0 and SCL is on GPIO2.