A LCD is used to display the light sensor’s output in lux. This code demonstrates how to interface BH1750 I2C digital light sensor with STM8S003K3. Other protocols like SMBus and I2S have similarities with I2C and so learning about I2C advances learning these too. To know more about I2C interface visit the following links: The slave reacts to this command by processing the request from the master and sending out data. Communication starts when master sends out a slave’s ID with read/write command.
The master is solely responsible for generating clock signals and initiating communication. Just like SPI, an I2C bus must contain one master device (usually a microcontroller) and one or more slaves. Unlike other communications, there’s no pin/wire swapping as two wires connect straight to the bus – SDA to SDA and SCL to SCL.
Still however, I2C is very popular because these issues rarely arise and because of its simplicity. In an I2C bus however it is not possible, by conventional means to interface devices with same device IDs or devices with different logic voltage levels without logic level converters and so on. Up to 127 devices can coexist in an I2C bus. It is as much as popular as SPI but compared to SPI it is slower and have some limitations. Just like SPI, I2C is widely used in interfacing real-time clocks (RTC), digital sensors, memory chips and so on. It just uses two wires for communication and so it is also referred as Two Wire Interface (TWI). I2C is another popular form of on board synchronous serial communication developed by NXP.
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