Example code for the EVE on a ESP with the WEMOS D1 mini

Simple weather station application for an ESP and a Matrix Orbital 4.3" Display.

• Designed for Matrix Orbital EVE3-43 SPI TFT Displays

  https://www.matrixorbital.com/ftdi-eve

• This code makes use of the Matrix Orbital EVE Library found here:

  https://github.com/MatrixOrbital/EVE2-Library

  • While a copy of the library files (Eve2_81x.c and Eve2_81x.h) is included here, you may look for updated files if you wish. This is optional, but the Eve2-Library is likely to contain an extension of what you have here in case you wish to make some more advanced screens.

• Matrix Orbital EVE SPI TFT display information can be found at: https://www.matrixorbital.com/ftdi-eve

Requirements

• WEMOS D1 Mini (Most models of the ESP32/ESP8266 should work, but are untested)
• A Matrix Orbital EVE3-43 display
• A Matrix Orbital EVE-SPI2BBC Breakout board
• A Matrix Orbital EVE2-USB2SPI-KIT-A USB to SPI Adapter board

1. Display setup

You need to upload the background image to the display Connect the EVE display to the USB2SPI board, be careful that the FFC is properly inserted in both headers Plug-in the USB2SPI to a USB cable and to your computer

To verify you can run the test program, you should see the Matrix Orbital logo

jpeg_demo_43_EVE3_TPN.exe

Download and install the EVE Asset Builder

https://www.matrixorbital.com/index.php?route=download/download/get&did=1695

With the EVE Asset Builder you will need to upload the images to the display

• a. Select Flash Utilities
• b. Select Flash Programmer
• c. Select MPSEE
• d. Click Detect

The software will connect to the display and verify the on-board memory

• e. Select the flash.bin file in the flash folder
• f. Click Update&Verify
• g. Verify the upload is successful

2. Wiring the ESP32 to the EVE Display

Display---SPI2BBC---ESP32

ESP	Breakout Board
GND	GND
3.3V	3.3V
D5	SCK
D6	MISO
D7	MOSI
D8	CS
D0	RST

3. Skeptch/Code setup

You will require the Arduino IDE

You may require to rename the folder to 'ESP-EVE3-Weather-Demo'

Load 'ESP-EVE3-Weather-Demo.ino'

Install the ESP8266 Board Manager

https://averagemaker.com/2018/03/wemos-d1-mini-setup.html

Configure the IDE by selecting the proper Board and COM Port.

Libraries required

to install Sketch > Include Library > Manage Libraries... and installing the library

• ESP8266 Weather Station library by ThingPulse, version 2.0.1 was used during development.
• Json Streaming Parser library by Daniel Eichhorn, version 1.0.5 was used during development.

openweathermap.org API Key

The datasource for this demo is the OpenWeatherMap API, befoure you can use this API you'll need to obtain a free API key.

• Go to https://openweathermap.org/appid/ and sign up for the free account.
• Obtain your API key from https://home.openweathermap.org/api_keys

openweathermap.org Location Code

• Go to https://openweathermap.org/find and search for the city of your choice.
• Click the link of the city of your choice and it will navigate to the weather page for this city. The last part of the URL will be the location code.

ie: If you Search for Calgary the page will be https://openweathermap.org/city/5913490 in this example 5913490 will be the location code.

Code Changes

Before you can run the code a few edits will need to be made in esp_weather_demo.ino

Variable	Purpose
WIFI_SSID	The name of the WIFI access point you would like to use
WIFI_PWD	The password required for the WIFI access point
OPEN_WEATHER_MAP_APP_ID	The openweathermap.org API key obtained above
OPEN_WEATHER_MAP_LOCATION	The Location Code obtained above
UTC_OFFSET	The time offset from DST

Compile and Run

Support Forums

http://www.lcdforums.com/forums/viewforum.php?f=45