Tutorial - Control LED

First, install the IDE!

Please refer to the mruby/cIDE installation page for instructions.

Writing the Program

First, launch the mruby/cIDE (mrubyc_ide.exe)
Select "File -> New… -> Project"
Then the "Setup New Project" tab will appear.
You must enter a Project Name (name it "led")
Click the OK button to close
Select "File -> New… -> File"
Then the "Setup Add New File" tab will appear.
You need to enter the file name, so enter it.

Write the program. Repeat LED ON/OFF every 1 second.


while  true # Infinite loop
  digitalWrite(0, 1) # LED1 ON
  sleep(1) # 1 second sleep
  digitalWrite(0, 0) # LED1 OFF
  sleep(1) # 1 second sleep
end

Pin Configuration etc.

Writing the Program to RBoard

After writing, connect the RBoard to the computer (using a USB-microUSB cable)

※Use a data transfer cable for the USB cable. (Charging cables will not work)

Select [File -> Settings…]
Check if the Port setting under [Build and Deploy -> Writer] is set to the RBoard port.

Click the OK button to close.
Click the Write button in the IDE to start the writing process.

Press the RS button on the RBoard immediately after [Start connection.] is displayed.


Start connection.
..........
                  
Can't connect target device.


Start connection.
Can't open serial port line.

The process is complete when LED1 (D1) starts blinking.

Task:

Try changing the blinking speed of the LED.

answer ➡


while  true # Infinite loop
  digitalWrite(0, 1) # LED1 ON
  sleep(0.1) # 0.1 second sleep
  digitalWrite(0, 0) # LED1 OFF
  sleep(0.1) # 0.1 second sleep
end

Try blinking two LEDs alternately.

answer ➡


while  true # Infinite loop
  digitalWrite(0, 1) # LED1 ON
  sleep(1) # 1 second sleep
  digitalWrite(1, 1) # LED2 ON
  digitalWrite(0, 0) # LED1 OFF
  sleep(1) # 1 second sleep
  digitalWrite(1, 0) # LED2 OFF
end

Try blinking four LEDs in sequence.

answer ➡


leds = [0, 1, 5, 6]
while  true
  leds.each do |i|
    digitalWrite(i,1)
    sleep(1)
    digitalWrite(i,0)
  end
end