Eventmachine compatible asynchronous, ruby-serialport library.
gem install em-serialport
If you are on Mac, you need to set up a virtual USB serial port by installing a driver from http://www.ftdichip.com/Drivers/VCP.htm. Identify your serial port device. For ex: /dev/tty.usbserial-xxxxxxxx
EM.run do
serial = EventMachine.open_serial('/dev/tty.usbserial-xxxxxxxx', 9600, 8, 1, 0)
serial.send_data "foo"
serial.on_data do |data|
# do something with data
end
end
The gem comes with a simple command line Serial Monitor. Launch it as:
bundle exec serial-monitor /dev/tty.usbserial-xxxxxxxx
Here is a working example, tested with an [https://github.com/railsbob/arduino-examples/tree/master/echo_server](arduino echo server). It simply reads and writes data to serial port from command line.
Serial monitor initialized. Enter data followed by a newline character.
Ctrl-C to stop
hello
received: hello
A very long sentence
received: A v
received: ery long
received: sentence