Beginner Led blinking pin

[espruino-discuss3]

Posted at 2015-03-13 by polaroid62

Hello , I have received my official board today and I try to make blinking a led on my breadboard and nothings happends. With the same circuit on my Arduino it's ok. Can anyone explain me how we choose the pins?

This is an example in Ruby for arduino wich works well.

*require "rubygems"
require "arduino_firmata"

arduino = ArduinoFirmata.connect
puts "firmata version #{arduino.version}"
stat = true
5.times do
    puts stat
  arduino.digital_write 11, stat
 stat = !stat
    sleep 0.2
end
15.times do
    puts stat
  arduino.digital_write 11, stat
 stat = !stat
    sleep 2
  
end*

[espruino-discuss3]

Posted at 2015-03-13 by @gfwilliams

Hi,

You should be able to use pretty much anything here. I'd avoid the ones with Purple boxes by them though - they are sometimes used for other things.

The circuit should be the same as for Arduino - just an LED and resistor. Like with the Arduino the LED must be around the correct way though.

About the simplest blinking light you can do is as follows - this one will blink the first LED:

setInterval("digitalWrite(LED,a=!a)",100);

For instance try connecting the LED to pin A8, and then type:

setInterval("digitalWrite(A8,b=!b)",100);

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Posted at 2015-03-13 by polaroid62

I can do for the first but with the others code nothing happens . I think I will try to make a video

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Posted at 2015-03-13 by polaroid62

Ok now it's working with A9 but not with A8

Sorry all is ok now I have forgotten to change the pin . Thanks for your help.

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Posted at 2015-03-13 by @gfwilliams

No problem! Glad you got it working!

Just so you know, A9 is one of the pins marked with purple here that you might want to avoid. It'll work, but if you ever solder bluetooth on then you won't be able to use that and bluetooth

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Posted at 2015-03-13 by polaroid62

Ok . It's an amazing board , it could be nice if someone would write a book about Espruino . Next month I will present Espruino to french's javascript developers .

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Posted at 2015-03-13 by DrAzzy

Isn't A9 pulled high by the idle serial port?

espruino/Espruino#142

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Posted at 2015-03-13 by @gfwilliams

I'm pretty sure A9 is fine once you start to write to it with digitalWrite.

However because of the STM32F1, it gets interesting if you try and use it for a 'peripheral' that's not GPIO :) The F4 in the Pico has a much better arrangement and won't suffer from those kinds of issues...