LED blinking (onboard LED)


while true
  leds_write(1)
  sleep(1)
  leds_write(0)
  sleep(1)
end


pinMode(0,0)
while true
  digitalWrite(0,1)
  sleep 1
  digitalWrite(0,0)
  sleep 1
end


pinMode(20,0)
while true
  digitalWrite(20,1)
  sleep 1
  digitalWrite(20,0)
  sleep 1
end
http://wiki.seeedstudio.com/Grove-Button/ 

pinMode(0,0)
pinMode(16,1)
while true
  leds_write(digitalRead(16))
end

7-Segment LED

Using 74HC4511, you can easily output with leds_write(0,1,5,6pin). 

j = 0
while true
  leds_write(j)
  j = j + 1
  if(j==10)
    j = 0
  end
  sleep(1)
end
Relay: https://www.switch-science.com/catalog/807/ 

  pinMode(0,0)
  pinMode(16,1)
  while true
    digitalWrite(16,1)
    sleep(1)
    digitalWrite(16,0)
    sleep(1)
  end