![]() ![]() ![]() Wire.begin() // Initialize hardware I2C pins Unsigned int counter = 9900 // This variable will count up to 65kĬhar tempString // Will be used with sprintf to create strings Here we'll define the I2C address of our S7S. #include // Include the Arduino SPI library ![]() I2CĬommunication is closed with Wire.endTransmission(). Where address is the 7-bit address of the device set to There are example functions for setting the display'sīrightness, decimals, clearing the display, and sending aĮach I2C transfer begins with a Wire.beginTransmission(address) Library to interface with a Serial 7-Segment Display. This example code shows how you could use the Arduino Wire The functionality is comparable to the last couple of example sketches: language:c Here's some example code, using I 2C (download here). Should be useful if you're making a national debt clock! Thanks to I 2C's addressing scheme, you could chain a large-ish number of Serial 7-Segment displays using just these two I 2C pins. These are useful if you want to link many S7S's together on a single I 2C bus. You may have noticed I 2C pins (as well as power pins) exist on both sides of the S7S. They should still be there, on pins A4 and A5 respectively. Older Arduinos may not have the devoted SDA and SCL pins. While (1 < Wire.There's not any give in this pin configuration you'll have to use the hardware I 2C pins. This make the communication not byte to byte controlled as I want it to be for my need. I realized that if I wanted to make an Arduino slave, when receiving from master, it actually reads from a buffer that is already previously received. But let’s start with the problem found in the Wire. When the limitations were somehow fixed, even though the small number of modifications (it is somehow a sort of hacking of the library) I found that the my final result were so useful to me that I thought was worth to write a short article about it. Then, when experimenting with a portability of a project in the Arduino environment, I started to trying the official Wire library, discovering some incompatibilities for my needs. I have spent a lot of time on playing and later working on the I2C buses. I almost always used self developed libraries, both for learning and job requirement purposes. ![]()
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