write data to a register using wire library

So I ordered some samples, warmed up by trying to interface to an I 2C EEPROM I had lying around (with no luck whatsoever, although I now know several things I did wrong and will go back to it soon), built some breakout boards, and got I 2C communications up and running on the Arduino this weekend.Īnd the number of mistakes I made along the way was staggering. This is actually a good thing - I 2C uses only two interface pins to talk to up to 127 devices, and SPI needs two pins for the bus plus a separate chip select line for each device - but it wasn’t what I was hoping for when I started looking. Nearly everything I could find - and everything I could find that was readily available and affordable - used I 2C. I’ve never worked with I 2C before and I thought I’d find something with SPI, but oh no, that was not to be the case. I started by looking for digital I/O expansion chips, and I did not start by looking for I 2C. So I’ll pitch in and give him some ideas and programming assistance on the digital I/O. Cort is very interested in learning the Arduino, but he hasn’t done much with microcontrollers lately and is to some extent playing catch-up with a decade’s worth of advances in technology. And Cort’s voter will have lots of pushbuttons, LEDs, and digital controls - more than he could wire directly to the Arduino he’s planning to use to control it. The voter picks the best signal from several different receivers (possibly several miles apart, linked back to the repeater base) and routes it to the repeater. A radio repeater receives transmissions at one frequency and rebroadcasts them at a nearby frequency, effectively boosting the signal (by repeating it) without increasing transmission power over the legal limit. So when he started describing his receiver voter project and suggesting that I might be able to help out on some of the digital interfacing, I jumped at the opportunity. He’s an amateur radio operator and very much into RF design, and I’m more interested in physical computing. Cort and I are good friends and both interested in electronics, but have had surprisingly little opportunity to work on electronics together.

Write data to a register using wire library