<![CDATA[Can I use Pins to connect external buttons and LED's?]]>Would it be possible to connect an external button as well as an external LED light to the expansion board? I'm hoping to connect a LoPy4 as well as a few buttons to the expansion board but I'm unsure if this is supported. Are there open pins I can use for general purposes like this?

Are there any tutorials on working with the pins? It doesn't look like the LoPy documentation has much there unless I'm missing something.

]]>https://forum.pycom.io/topic/3418/can-i-use-pins-to-connect-external-buttons-and-led-sRSS for NodeFri, 14 Aug 2026 11:58:35 GMTThu, 28 Jun 2018 21:02:15 GMT60<![CDATA[Reply to Can I use Pins to connect external buttons and LED's? on Thu, 28 Jun 2018 21:02:15 GMT]]>Would it be possible to connect an external button as well as an external LED light to the expansion board? I'm hoping to connect a LoPy4 as well as a few buttons to the expansion board but I'm unsure if this is supported. Are there open pins I can use for general purposes like this?

Are there any tutorials on working with the pins? It doesn't look like the LoPy documentation has much there unless I'm missing something.

]]>https://forum.pycom.io/post/20521https://forum.pycom.io/post/20521Thu, 28 Jun 2018 21:02:15 GMT<![CDATA[Reply to Can I use Pins to connect external buttons and LED's? on Thu, 28 Jun 2018 22:16:33 GMT]]>Hey Cooper, the part in the documentation you need is 6.2.1.4 Pin. This gives you the basics of running an LED from a pin or using a button as an input.

If you connect a button between a pin and ground (0V) then you need to configure the pin with a pull-up resistor. Vice-versa works too: a button between the pin and 3.3V with a PULL_DOWN on the pin.

p_in = Pin('P10', mode=Pin.IN, pull=Pin.PULL_UP)

When you connect an LED to a pin you need a resistor in series with the LED. 220ohms should work.

When you look at the LoPy Pinout Diagram all those pins marked as GPIOxx can be a button input or LED output. So you can use lots!

  • Chris.
]]>https://forum.pycom.io/post/20525https://forum.pycom.io/post/20525Thu, 28 Jun 2018 22:16:33 GMT<![CDATA[Reply to Can I use Pins to connect external buttons and LED's? on Fri, 29 Jun 2018 01:36:04 GMT]]>@prawnhead thank you! That's exactly what I needed to know :)

]]>https://forum.pycom.io/post/20533https://forum.pycom.io/post/20533Fri, 29 Jun 2018 01:36:04 GMT