See the Arduino serial lab, the Serial Input to the P5.js IDE lab or the Serial Communication with Node.js lab for more on sending serial from Arduino to another computer. When two devices are communicating serially, they can’t read each other’s program logic. The SoftwareSerial library has been developed to allow serial communication on other digital pins of the Arduino, using software to replicate the functionality (hence the name 'SoftwareSerial '). It is possible to have multiple software serial ports with speeds up to 115200 bps.
I'm setting up a robust protocol to read data (from accelerometer) from an Arduino board via serial port with Python.I am using Python 3.4 at the moment, but I could go back to a previous version.
Now, the code is working until I shake the accelerometer a lot. At which point I receive this error:
I used this solution and adapted it to Python 3.4 (added b infront of the n character):
The data are sent by the board in a simple format (Arduino Code):
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I assume that my protocol is not robust or I made some error in the parsing, but I can't figure it out.Thanks a lot for help,Michele
1 Answer
Have a look at:
Arduino Serial Communication Protocol
It's a robust protocol that uses byte stuffing to mark a frame start so if somehow the receiver gets out of sync it automatically resets at the right point. There's a Python implementation there too, and a 'hello world' program that runs across the Arduino and PC.
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Arduino Serial Communication Protocol Training
Arduino Serial Communication Tutorial
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Arduino Serial Communication Example
There are many ways to communicate with remote Arduinos. I have found that many of them hit a slightly higher price point than what I would like. Also, ethernet shields (and wifi dito?) consume many valuable hardware pins. I will describe how to communicate host to Arduino using commercially available wireless serial ports. They are cheap(ish) and only use the rx/tx pins. The drawback is that the air-protocol isn't encrypted so I wouldn't use it for sensitive applications. I use it to control lighting. I would be more impressed than offended if a neighbour hacked my indoor lighting. Serial ports (even wireless) are designed for point to point communication. It is possible to use in one-to many or other constellations but certaing design consideration have to be taken. My Arduino library referenced in step 5 supports one-to many.
The described project is for one-way or two-way communication using (i. e. transciever). If you know you will only send commands 'blindly' you can attach a transmitter to the PC end and a receiver to the Arduino. Those modules are really cheap.
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