Lolin I2c Port

Another illustration that demonstrate how to wire the i2c 16 2 lcd on esp8266 12 known as nodemcu as you can see the diagram below the scl as arduino analog pin a4 is connected to d1 on nodemcu at the same time the d2 as the sda represent as analog pin a5 on arduino board as you may notice that the sketch code that we used it is not lua script it is actually standard arduino c compiled. Additionally this board offers rich interfaces such as tft display port i o s via breadboard compatible headers a micro sd card slot and an i2c header. Also known as smbus or twi though smbus have some additions to the i2c protocol.

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For a newbie adding an i2c device can be frustrating.

Lolin i2c port. If you just want more gpio you will find an i c gpio port expander such as the mcp23017 much more suitable for that 16 more gpios at the cost of 2 gpio pins the i2c bus. I c i2c iic is a serial 2 wire bus for communicating with various devices. If you re already using the i2c bus in a project then you don t even loose additional gpios it s just one more device on the bus. Several things need to line up properly for things to work.

The i2c port address scanner ino will not only discover the address of your i2c device but also the port numbers to which sla and slc are connected. Get started with micropython d1 d1 mini series get started with arduino d1 d1 mini series. Compatible with arduino micropython. Various boards have different mappings between port number and gpio number.

The lolin d32 comes with a standard micropython firmware and is also compatible with arduino and supports other alternative firmware. Tf micro sd card slot support spi mode. Esp8266 chip does not have hardware i c so module uses software i c driver. It can be set up on any gpio pins including gpio16 see below.