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OLED ARDUINO I2C EXAMPLE HOW TO
OLED ARDUINO I2C EXAMPLE SOFTWARE

OLED ARDUINO I2C EXAMPLE SOFTWARE

Software Libraries Advantages and DisadvantagesĪll of these libraries are used in place of Wire.

It comes with two examples – an I2C scanner and a multiple OLED display sketch.

It comes with additional Seeedstudio libraries to use in an example sketch.

Software_I2C is another implementation of I2C that is also documented on the Seeedstudio Wiki.

It is dependent upon a library called AsyncDelay.

SoftWire is an I2C software implementation that uses basic Arduino functions to allow any pin to be used for I2C.

It comes with three example sketches, including an I2C scanner.

SoftI2CMaster is a simple I2C software implementation.

There are a few of them that will work, I’ve outlined three of them here. If you want to use multiple I2C buses on the Arduino without any additional hardware then you’ll need to use an alternate library for I2C. It uses the pins on the Arduino which are dedicated to I2C, so for example on the Arduino Uno it uses pin A4 as SDA and A5 as SCL.įor all of its great features, it has some shortcomings – Wire does not allow you to have multiple I2C buses, you can only call one instance of it and you can’t redirect your I2C traffic to different pins. The standard Wire Library included with the Arduino IDE allows you to communicate via the I2C bus in either master or slave mode. Let’s look at these methods to decide which one is best for our needs.

Software – Use an alternate I2C library that supports I2C on any Arduino I/O pin.

Turns out you can actually do this two ways: So how do you implement multiple I2C buses with an Arduino? Which is great, except most microcontrollers like the Arduino only have a single I2C bus. Then have your bus master connect to both buses. There is only one real answer – remove one of the devices from the I2C bus and place it on another I2C bus. How do you handle conflicts between these devices? Multiple I2C Bus Solution This is especially convenient if you want to use two identical devices in your design.īut many I2C devices have a hardcoded address that cannot be modified.

By setting the address to something unique on our bus address conflicts can be avoided. This can be in a form of DIP-switches, jumpers, or solder traces to cut or bridge. Some slave devices, like displays or sensors, have configurable I2C addresses. It’s a basic rule of I2C – every slave device needs to have a unique address. If the slave devices are sensors or require two-way communication with the host then this situation is unworkable. But if you wanted to address each display independently you’re out of luck. This actually might come in handy if you wanted to put two identical displays on your project. The result was what you might have expected – both displays showed the same image.

In a previous article on Using OLED Displays, I hooked up two small OLED displays that had the same I2C address toa single I2C bus. The two I2C slaves have the same address, which is not going to work. Here is an example of an I2C address conflict: The following illustrations should serve the purpose. Just to make sure that we’re all on the same page let’s take a quick look at what the problem actually is.

It’s not an unsolvable problem, it wouldn’t be a very interesting article if it were! There is actually a very simple solution to the problem and it can be implemented in several different ways. Today we are going to look at and resolve one of the problems that we can run into when hooking up multiple devices via I2C – what to do when two devices need to use the same slave address? You can refer back to those articles if you need to bring yourself up to speed on how the bus works, which would be a good thing to know before delving into today’s content. I2C with Arduino and Raspberry Pi – Communicating between a 5-volt bus Arduino and 3.3-volt bus Raspberry Pi.

OLED ARDUINO I2C EXAMPLE HOW TO

Building an I2C Slave – Learning how to run an Arduino as either an I2C master or slave and building a custom I2C sensor.

Getting started with the I2C Bus – Learning what the bus is, what its origin was and how to use it with the Arduino.I have done many projects that have used I2C devices and have also covered the bus extensively in three sets of articles and videos: We have worked with the I2C bus many times before here in the DroneBot Workshop. The Inter-Integrated Circuit, or I2C, bus has done a lot to simplify the design of systems using microcontrollers, sensors, displays, and microcomputers.