Izotope serials. This is old and very odd example code for kids and adults. The code example of DD83 is really a mess and doesn't deserve to mention as example on this site.: Arduino as slave to a PC 'master' device. An Arduino was given an LED and a switch.
With the software provided for it in the demo, a PC's screen has a window with buttons for 'Turn LED on' and 'Turn LED off', and a text message saying 'Switch input is high' or 'Switch input is low'. The code for the program to run in the Arduino is also supplied, of course. The hardware and software in the Arduino is 'generic', and could be used unchanged with many different 'master' controllers.
Part of the reason for the project was to encourage others to show other solutions. The demonstration's master device was programmed with, but the discussion of the demo should enable proponents of other languages to create equivalent applications to show people how easy it is to use the language they like. Such people are invited to ask for links to their work from the demo's page. The project was never meant to be particularly useful in it's own right. Rather, it serves as a template. For instance, the switch could be replaced with a temperature sensor and the LED with a relay to turn a home's heating on. The PC + Arduino could then become the world's most over-engineered thermostat!
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(Of course that could be done with Arduino alone!) But other systems consisting of (one or more) Arduinos connected to a PC are more meaningful. The way the software is written, it would not be hard to turn things around, and have the Arduino as the master, the PC as the slave. The system uses a dedicated serial link, leaving the Arduino's 'main' serial link dedicated to programming the Arduino and communicating with. But again, it would be trivial to 'move' the serial link to pins D0 and D1, if you wished to.
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I have an RFID reader connected to an Arduino board. I'd like to connect to it over its serial interface, and whenever the RFID reader omits a signal ( when it has read an (RF)ID ), I'd like to retrieve it in my C program. I already have the code for simply printing the RFID to serial from the Arduino.
What I don't know, is how to read it from C in Linux? I have looked at libserial, which looks straightforward. However, how can I have the C program react to a signal and then read the RFID, instead of listening continously?
Is this necessary? EDIT: In most examples I have read, the (c) program sends input, and recieves output. I just want to listen and recieve output from the Arduino. The part of the Interface section in the Arduino Playground has several examples of interfacing, including one with the Arduino as Linux TTY.
Try the forum and the forum on the Arduino site. There have been discussions about interfacing to many different languages and computers in the past. And finally check out the and sites. The Arduino IDE is based on the Processing language, and the Wiring environment and dev board is related to Arduino.
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Both sites have lots more examples and links to even more resources. Edit: I just realized that I didn't answer your actual question.
These are all general communications resources, but some may have hints towards how to alert the computer of a new RFID input.
Arduino and Linux TTY /edk4971 posted in the forums on with the correct parity, baud, etc to talk to Arduino. Repeating it here: stty -F /dev/ttyUSB0 cs8 115200 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts make sure /dev/ttyUSB0 or whatever your Arduino's port is, and 115200 is the baud you did your Serial.begin(XXXX) with. You can then do: echo 'Hello Arduino' /dev/ttyUSB0 to send the string (followed by a newline) to your Arduino. Taken from this forum: You can also do: tail -f /dev/ttyUSB0 to read what your Arduino has to tell you.
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