I have had luck getting started by loading the following Arduino library and testing one of the SSD1306's included Example sketches. If the sketch fails to compile with errors, make sure you change the address it failed on to (0x3c, 5,4). This ESP’s dedicated I2C pins are on GPIO 5 and 4 for data and clock respectively.
I’m having trouble just getting FastLED to work properly with a Wemos D1 mini. I’m just trying to run the example cylon code, and the only modifications made were to set the LED pin to D6 on the D1, and to include the esp8266 library. It is running but I’m getting some strange random flashing, as seen in this video. Any ideas? Hardware-wise I’m using the evil genious board with level
Tasmota supports several I2C devices. To use them I2C and the device need to be enabled at compile time. I2C and some devices are supported also in the official releases. Devices can be de/-actived on runtime to solve possible address conflicts. (e.g. address 0x27 is used by multiple devices) Using command I2cDriver individual drivers can be
1. break out board for ESP8266. This is made of a 4x4 veroboard, PCB headers, and jumper header. Be sure to score a line to separate the copper strips from shorting the adjacent pins. 2. Serial comm options on Arduino (s) ESP8266 and Arduino needs 2 serial comms; either 1 hardware 1 software or 2 hardware serial.
My current device is powered by 24V, DC-DC converter to get 5V, Wemos D1 mini, I2C level converter 5V/3V3 and DS2482 powered by 5V. 4k7 pull-ip for OneWire sensors. This device contains one RJ45 connector for temperature sensors network connection. There are 4 sensor connected to this. No breadboard, all properly on PCB. How to replicate problem:
The DS18B20 is a temperature sensor that can be used in various simple projects. This part uses the 1 wire (I2C) bus and you can connect multiple sensors up to your Arduino. The part is also relatively low cost and only requires an additional 4k7 pull up resistor. In the example below we shall make a basic example that reads the temperature and mrvYg.
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    • wemos d1 mini i2c example