ESP8266 Community Forum

It might not be the most original project but maybe a beginner can learn something from it. The ESP8266 connects to openweathermap.org, gets the weather for a given location and displays a weather symbol, temperature and humidity on a 128x64 pixel OLED I2C display:



Please find the sources here:
https://github.com/squix78/esp8266-projects/tree/master/weather-station
and some additional information here:
http://blog.squix.ch/2015/05/esp8266-projects-internet-connected.html

This looks very nice - I'm having a bit of trouble getting it working.
Does it require a certain nodemcu version?
It's looking to do some ug8 functions - is there a ug8 library that needs to be installed?

Just take the latest NodeMCU Lua build. U8glib is already part of it. What problems are you facing? Not enough memory? Please describe in more detail what is not working/ what you see...

The error I am getting is
?:0: attempt to index global 'u8g' (a nil value)

My ESP environment is an ESP-201 module in one of these breakout/proto boards that I always use
http://blog.squix.ch/2015/02/esp8266-esp-201-breakout-board-review.html
To troubleshoot I have tried:
1. testing the oled display with an Arduino board and the u8G library - works
2. testing on the ESP (An ESP-201 module) with both your Weather and your other graphics test - fails with the above error.
3. testing on a second -201 module - same error
4. swapping gpio pins 12 & 14 to the display in case I wired wrong - same error
5. testing on the -201 with the u8g test Lua examples - these get the same error. I know I have had these working in the past. - Same error
6. I have also tried various versions of NodeMCU from Feb - March. All have the same error.


So - the display is known good and I don't think there's any problem with the -201(s). They work with other tests.

I'm sure it's something on my end. it is very frustrating to know that I have had this type of thing working - in fact I'm watching my mqtt traffic right now on a little dedicated ESP-12/Oled display "message board" project of mine that is programmed inNodeMCU/ Lua.

I really like the look of your project and hope I can get it to work soon.