This is a multifunction GPS-based speedometer

Hardware Required * WeMos D1 Mini microcontroller * GPS module * Nextion NX2432T024 HMI display * DHT22 temperature/humidity sensor * Optional 128x64 IIC oled display * Jumper wires

Displays on a Nextion display the following Data

• Speed
• Heading
• Current time
• Date
• Temperature
• Humidity
• Heat index

Library Dependencies:

• Nextion by ITEAD Studio
• ESP8266_SSD1306 by Fabrice Weinberg & Daniel Eichhorn
• Adafruit Unified Sensor by Adafruit
• DHT sensor library by Adafruit
• TinyGPSPlus by Mikal Hart

Required changes for Nextion:

• NexConfig.h: Comment out DEBUG_SERIAL_ENABLE, we're not using Nextion debug Only Serial1 TX pin is connected, we can't recieve anything from Nextion ESP8266 Serial1 RX is not available, it is used used internally by WeMos
• NexHardware.h: change timeout values to zero otherwise display will be very slow

Connections

• D1 GPIO5 SCL -- OLED
• D2 GPIO4 SDA -- OLED
• D3 -- DHT
• D4 -- NexTion Serial1 Tx
• TX -- GPS
• RX -- GPS

The program was written to use platformio + vscode. If you use Arduino you will need to modify the name and include the proper libraries.