2/2/2024 0 Comments Arduino wire library for esp32![]() ![]() In the image above, the ESP32 SDA/SCL pins (GPIO21/GPIO22) are connected in parallel to all my I2C sensors and devices. If you are new to Arduino programming then you might be surprised that you only just need to connect the SDA/SCL combinations of your sensors to the same I2C pins of your microcontroller. The usual question that I received is how they can connect multiple I2C devices or sensors on their Arduino-powered microcontrollers such as the Arduino Uno, ESP8266, or ESP32. How to connect multiple I2C devices in Arduino? Check your sensor data sheets on how to do this. But fortunately, these sensors have the ability to change the default I2C address by soldering some jumper components. The problem with I2C is that you cannot connect two sensors/devices on the same SDA/SCL pins with the same I2C address. Usually, manufacturers of sensors and other I2C components have a default I2C address assigned for their sensors out of the box. This is what an I2C address is all about and this should be a distinct address that ranges from 0 to 127 (0 to 0x7F in Hex) that will uniquely identify each sensor connected to your controller. ![]() What is I2C? What is I2C Address?īecause of the I2C’s ability to connect multiple devices along its bus (or two wires) then the controller or our Arduino-powered board needs to somehow know where to send data. As an aside, there are other protocols widely used in Arduino-based projects such as the SPI, Serial or UART, and One-Wire but that is beyond the scope of this post. We will not be discussing in detail how this I2C protocol works in this post but you can check the Wikipedia link if you want to know more. This ability to connect multiple sensors on a single bus (SDA/SCL combination) makes it ideal for any Arduino-powered circuits especially if you are controlling multiple sensors or components. It can support multiple controllers(masters) and multiple devices or peripherals(slaves ). Well, technically speaking it is still 4 wires as you need the GND and VCC pins to provide power. ![]() I2C uses two wires which are called the SCL (Serial Clock) and SDA (Serial Data). I2C or Inter-Integrated Circuit (pronounced as eye-squared C) is one of the popular communication protocols used to allow multiple sensors to communicate with your microcontrollers. Arduino Basic: How to use the Arduino I2C Scanner? What is I2C? ![]()
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