This is a simple weather display built with ESP8266 WiFi chip and 7.4" E ink display from Pervasive Displays. Weather data is gathered from OpenWeatherMap service. Additionally, the device’s internal temperature sensor reading is sent to data.sparkfun.com service.
Most of the time the device stays in deep sleep mode consuming only 18 µA. While updating the weather power consumption varies from 80 to 150 mA. Update operation takes a few seconds, depending on WiFi router, DHCP server and internet connection speed. With 30 minute update interval 3000 mAh battery should last for a few months on one charge.
- Install esp-open-sdk
- Clone this repository
$ git clone https://github.com/andrei7c4/weatherdisplay
$ cd weatherdisplay/app
- Set SDK paths and esptool parameters for your ESP8266 module in makefile
- Finally build everything and flash the binary
$ make all
$ make flash
- Install Unofficial Development Kit for Espressif ESP8266
- Download ZIP or clone this repository
- In Eclipse select File->New->Makefile Project with Existing Code
- Set Existing Code Location to
<full path to>weatherdisplay\appand click Finish - In newly created project properties (C/C++ Build) change build command to
mingw32-make.exe -f ${ProjDirPath}/Makefile - In C/C++ Build/Environment add
PATHvariable with paths to MinGW and MSYS, e.g.C:\MinGW\bin;C:\MinGW\msys\1.0\bin - In Make Target view right click on newly created project and select New
- Set Target name to
alland click OK. Repeat this forcleanandflashtargets. - Set SDK paths and esptool parameters for your ESP8266 module in makefile
- You should now be able to build and clean the project and flash the binaries
Custom fonts and icons can be created with this tool.
Any ESP8266 based module with at least 1 MB flash and SPI pins, such as ESP-12E, can be used. Development boards, such as NodeMCU-DEVKIT or similar, can be used too, but power consumption of these boards might not be as low.
The display with control board can be purchased from DigiKey. Display is connected to ESP8266 in the following way:
| TCM-P74-230 | ESP8266 |
|---|---|
| /EN | GPIO5 |
| /BUSY | GPIO4 |
| MISO | HMISO (GPIO12) |
| MOSI | HMOSI (GPIO13) |
| /CS | HCS (GPIO15) |
| SCK | HSCLK (GPIO14) |
Additionally, there are 3V LDO regulator, programming circuit and USB to UART bridge (CP2102 or similar can be used). Please see the schematics here.
Device settings can be changed through the serial interface (115200/8-N-1). The following syntax should be used:
parameter:value<CR>
At least the following parameters must be set by the user:
- ssid - WiFi SSID
- pass - WiFi password
- city - Weather and forecast are shown for that city (check supported city names)
- appid - OpenWeatherMap API key
Additionally, data.sparkfun.com service keys can be set:
- publickey
- privatekey
If these keys are not set, internal temperature will only be shown on the display but not sent anywhere.
The following user interface options are available:
- chart:0 - No forecast charts (icons only)
- chart:1 - Forecast chart for the next 24 hours
- chart:2 - Forecast chart for the next five days
- chart:3 - Both forecast charts
Please see the config.c file for additional supported parameters.
