<![CDATA[How to use OLED with GPIO]]>Just getting started with the onion.... And I have the OLED board, but it uses all the pins... how can I do something like get temperature data on a GPIO pin and display the result on the OLED?

]]>http://community.onion.io/topic/1507/how-to-use-oled-with-gpioRSS for NodeTue, 17 Mar 2026 14:07:11 GMTSun, 29 Jan 2017 04:39:17 GMT60<![CDATA[Reply to How to use OLED with GPIO on Sun, 29 Jan 2017 04:39:17 GMT]]>Just getting started with the onion.... And I have the OLED board, but it uses all the pins... how can I do something like get temperature data on a GPIO pin and display the result on the OLED?

]]>http://community.onion.io/post/9818http://community.onion.io/post/9818Sun, 29 Jan 2017 04:39:17 GMT<![CDATA[Reply to How to use OLED with GPIO on Sun, 29 Jan 2017 07:20:42 GMT]]>@Frank-Blau I am assuming you are using the OLED expansion plugged into the Expansion Dock (or the Power Dock). If so, you are correct, the OLED covers the whole of the GPIO header making it difficult to access the GPIO pins.

Your best bet is probably to get a Proto Expansion (https://onion.io/store/proto-expansion/). This provides a small soldering area with access to all the GPIO pins. You can connect your temperature sensor (etc.) to this.

Then plug the Proto Expansion in to the Expansion Dock first and then plug the OLED on top of the Proto Expansion.

]]>http://community.onion.io/post/9824http://community.onion.io/post/9824Sun, 29 Jan 2017 07:20:42 GMT<![CDATA[Reply to How to use OLED with GPIO on Wed, 01 Feb 2017 00:04:33 GMT]]>@Frank-Blau

If you have thin enough or stranded wire, you can try squeezing it into the GPIO in the Expansion Header on the Dock and then inserting the OLED pins on top of it. You should be fine just as long as any loose strands of wire do not short or make contact with the other pins on the Expansion.

Gabe

]]>http://community.onion.io/post/10047http://community.onion.io/post/10047Wed, 01 Feb 2017 00:04:33 GMT<![CDATA[Reply to How to use OLED with GPIO on Wed, 01 Feb 2017 00:15:09 GMT]]>@Gabriel-Ongpauco Possible - but not highly recommended as a permanent solution 🙂

]]>http://community.onion.io/post/10051http://community.onion.io/post/10051Wed, 01 Feb 2017 00:15:09 GMT<![CDATA[Reply to How to use OLED with GPIO on Sat, 04 Feb 2017 15:26:32 GMT]]>Is there documentation of which pins the OLED is using so you know which pins are available if you insert something in between?

This is probably really obvious, but i couldn't quite figure it out.

]]>http://community.onion.io/post/10322http://community.onion.io/post/10322Sat, 04 Feb 2017 15:26:32 GMT<![CDATA[Reply to How to use OLED with GPIO on Sat, 04 Feb 2017 21:55:20 GMT]]>@Patrick-Rainsberry The OLED uses I2C, so (as far as I am aware) the only pins you should need to connect are:

  • I2C SDA
  • I2C SCL
  • GND
  • 3.3V

On the Omega2, the position of these pins is shown in https://raw.githubusercontent.com/OnionIoT/Onion-Docs/master/Omega2/Documentation/Hardware-Overview/img/Omega-2-Pinout-Diagram.png which comes from https://docs.onion.io/omega2-docs/omega2.html

Because the OLED is designed to plug in to the Expansion Dock, you can see where the pins are from https://raw.githubusercontent.com/OnionIoT/Onion-Docs/master/Omega2/Documentation/Hardware-Overview/img/expansion-dock-expansion-header-pinout.png which comes from https://docs.onion.io/omega2-docs/expansion-dock.html

]]>http://community.onion.io/post/10391http://community.onion.io/post/10391Sat, 04 Feb 2017 21:55:20 GMT<![CDATA[Reply to How to use OLED with GPIO on Sat, 04 Feb 2017 23:06:15 GMT]]>You could plug the OLED into a small proto board and the run the 4 wires to the OLED Expansion board.

]]>http://community.onion.io/post/10419http://community.onion.io/post/10419Sat, 04 Feb 2017 23:06:15 GMT<![CDATA[Reply to How to use OLED with GPIO on Sun, 05 Feb 2017 16:12:03 GMT]]>@Kit-Bishop @Don-DeGregori Thanks! Much appreciated. DOn't know why i didn't just look at the traces on the board from the beginning LOL

For reference it appears that:

  • I2C SDA
  • I2C SCL
  • GND
  • 3.3V (both of them)
  • GPIO 11

Are in use.

]]>http://community.onion.io/post/10490http://community.onion.io/post/10490Sun, 05 Feb 2017 16:12:03 GMT<![CDATA[Reply to How to use OLED with GPIO on Sun, 05 Feb 2017 22:51:57 GMT]]>@Patrick-Rainsberry This is pretty well what I expected except for the usage of GPIO 11 which surprises me

I have access to the circuit diagrams for the Omega1 and Expansion Dock and OLED Expansion
On these, what is marked as GPIO 11 on the pin out diagrams referenced above is used for VDD25 (i.e. 2.5Volt supply) and is used on the OLED Expansion to supply power to level shifters between the I2C signals from the Omega and the OLED display chip.

I am unable to find schematics for the Omega2 (hint to Onion devs: can we have ALL schematics for the Omega2 and related boards please 🙂 ) so can't tell whether this has been repurposed for the Omega2 etc. or whether the pin out diagrams for the Omega2 etc in the Omega2 docs referenced above are wrong in this respect

]]>http://community.onion.io/post/10526http://community.onion.io/post/10526Sun, 05 Feb 2017 22:51:57 GMT