![]() ![]() For some experiments, two-axes may be perfectly fine, and I’m happy to save the $11.) (I’m also looking at using a two-axis accelerometer that’s much less expensive than the three-axis one I’ve been using – $4 versus $15. The trade-off is a little bit more complicated protocols semantics, but nothing out of control. It only uses two-wires, rather than the four required for SPI, so schematic designs and board layouts become a bit more manageable. I’m doing this partially because it would be good to know how it works, but also because it’s electrically more compact. I have been using the Arduino and Atmel microcontroller’s generally using the SPI (serial-peripheral interface), but decided to look at the two-wire (a.k.a. ![]() Subscribe to our newsletter to be the first to hear from our cultural voyeurs and time-traveling anthropologists who regularly report on the signals and artifacts they bring back from the future. Join us to our office hours to discuss design, design fiction, projects you are working on and generaly Q&A. This makes the linker happy and allows your program to build.You are browsing the archives of the Near Future Laboratory blog. the program file that contains your start and loop functions). The magic thing to know is that if any of your libraries use Wire.h or SPI.h you must Include them in the main source file (i.e. It’s one of those horrible situations where you have to know the “magic” trick to make it work. I’ve had this before, it is very frustrating. The compiler kept complaining about the Wire.h and SPI.h libraries not being available. I’d added the AdaFruit libraries and at that point my program broke. I’ve been creating a “Connected Little Boxes” driver for the BME280 environmental sensor (a personal favourite of mine). I hardly ever use them personally, I rely on people much cleverer than me to create libraries that I can use to talk to the hardware I want to use. They’re used by programs to communicate with devices over the I2C and SPI busses. ![]() The Wire.h and SPI.h Arduino libraries are kind of important. ![]()
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