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E-Paper Weatherforecast

I made this E-Paper Weather forecast for my girlfriends 25th Birthday.

It will beforme the following task

  1. Connect to Wifi
  2. Get data from OpenWeather API
  3. Display data
  4. Go to deep sleep (defined by user)

Here is the Thingiverse page for the STL files and Material List.

You can pin it on a fridge like this:

The device is made with a Lilygo Epaper. For more details regarding the Pinouts please have a look at the website.

Code

The code uses the API from OpenWeather. It is calling the API every houre (or depending on what you set in the code). You need the API key to retreive data (I you call the API seldomly a free account will be sufficient).

main.cpp

Set how long we set the E-Paper in deep sleep

const uint64_t TIME_TO_SLEEP  = 3600; // Time ESP32 will go to leep in seconds) every 1h

Set up the Wifi initails

WiFi.begin("<ssid>", "<psw>");

Set OpenWeather city and API key

httpWeather.begin("http://api.openweathermap.org/data/2.5/forecast?q=<city>,de&cnt=3&units=metric&appid=<id>");
httpWeatherNow.begin("http://api.openweathermap.org/data/2.5/weather?q=<city>,de&cnt=3&units=metric&appid=<id>");

Additional

Next to the date is a small number which counts the wake ups from deep sleep. To remove thsi number just delete:

display.setFont(&FreeMonoBold9pt7b);
display.setCursor(55, 121);
display.print(bootCount);

If you get an error like this:

In file included from .pio/libdeps/esp-wrover-kit/GxEPD/src/GxDEPG0150BN/../GxEPD.h:20:0,
                 from .pio/libdeps/esp-wrover-kit/GxEPD/src/GxDEPG0150BN/GxDEPG0150BN.h:9,
                 from .pio/libdeps/esp-wrover-kit/GxEPD/src/GxDEPG0150BN/GxDEPG0150BN.cpp:4:
.pio/libdeps/esp-wrover-kit/GxEPD/src/GxDEPG0150BN/../GxFont_GFX.h:77:13: error: 'int16_t GxFont_GFX::getUTF8Width(const char*)' cannot be overloaded

comment:

GxFont_GFX.h

int16_t getUTF8Width(const char *str);

GxFont_GXF.cpp

int16_t GxFont_GFX::getUTF8Width(const char *str)
{
  return ((_font_gfx == U8g2_for_Adafruit_GFX_font_gfx) ? _U8G2_FONTS_GFX.getUTF8Width(str) : 0);
}