https://github.com/nilathj/esp32-crypto-ticker

MQTT ESP32 crypto price ticker client
https://github.com/nilathj/esp32-crypto-ticker

cryptocurrency esp32 mqtt platformio st7789

Last synced: 2 months ago
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MQTT ESP32 crypto price ticker client

• Host: GitHub
• URL: https://github.com/nilathj/esp32-crypto-ticker
• Owner: nilathj
• Created: 2023-08-15T04:19:11.000Z (almost 3 years ago)
• Default Branch: master
• Last Pushed: 2023-08-15T05:40:11.000Z (almost 3 years ago)
• Last Synced: 2025-03-21T04:34:25.712Z (over 1 year ago)
• Topics: cryptocurrency, esp32, mqtt, platformio, st7789
• Language: C
• Homepage:
• Size: 4.9 MB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

          
# MQTT Crypto price ticker using an ESP32-WROOM-32 with a 240x280 TFT using the SPI ST7789 interface controller

  

Text is drawn by using the TFT_eSPI library using the google Noto Sans anti-aliased font that is loaded into a flash array.

The price tracker client display the coin name, price, daily % move (+ or -), daily volume.  This information is received by the client listening in on a MQTT topic as a JSON payload.

### Crypto prices display

![Crypto prices](docs/cryptoPrices.jpg)

## Prerequisites

* This code is using platformio with TFT_eSPI, AsyncMqttClient and ArduinoJson libraries.  Refer platformio.ini.

* A MQTT server publishing price JSON payloads to the MQTT_PRICE_TOPIC (crypto/prices) periodically.  Refer [Docker Python Crypto Price Server](https://github.com/nilathj/crypto-price-server)

* Setup SSID and WIFI password

## Crypto price display code

1. Connect to wifi

2. Connect to MQTT server

3. Subscribe to MQTT_PRICE_TOPIC

4. mqttClient.onMessage

   - Deserialise the JSON payload in the MQTT message

   - Parse JSON

   - Display crypto price data on the TFT using TFT_eSPI library.

## Structure of the expected JSON in the MQTT payload

```

{

   "time":"Sat 1-04-23  19:09:15",

   "coins":[

      {

         "name":"BTC",

         "price":"$28,451",

         "price_change_24h":"2.2%",

         "vol":"17B"

      },

      {

         "name":"ETH",

         "price":"$1,825",

         "price_change_24h":"1.5%",

         "vol":"10B"

      },

      {

         "name":"ADA",

         "price":"$0.39",

         "price_change_24h":"1.4%",

         "vol":"759M"

      },

      {

         "name":"DOT",

         "price":"$6.26",

         "price_change_24h":"0.6%",

         "vol":"202M"

      }

   ]

}

```

## Design

Python crypto price server running in docker --> MQTT server --> ESP32-CRYPTO-TICKER client