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Tutorial: SCD30 BLE Gadget with Screen

Summary

This tutorial enables you to setup a CO2-Monitor sending CO2 measurements via Bluetooth to nearby mobile phones. It also features a onboard screen to directly read the C02 measurements. More specifically, we will here use a LILYGO® TTGO T-Display ESP32 which is an ESP32 DevKit with a small 1.14 inch display attached.

All steps necessary and links to the compatible app for Android and iOS are provided here.

The tutorial is structured in 3 parts:

  • Hardware Setup: Learn how to wire the sensor to the development board.
  • Software Setup: Learn how to setup your computer to program the development board.
  • Monitor Setup: Learn how to monitor your CO2 levels on your computer and via the Sensirion MyAmbience app.

Hardware Setup

To complete this tutorial, you'll need:

Connect the SCD30 sensor to the TTGO T-Display ESP32 as depicted below. Please note, that your developer kit may have a different pin layout. If you're using different pins or have a different layout, you might have to adjust the code accordingly.

  • VDD of the SCD30 to the 3.3V of the ESP32
  • GND of the SCD30 to the GND of the ESP32
  • SCL of the SCD30 to the IO22 of the ESP32
  • SDA of the SCD30 to the IO21 of the ESP32

Software Setup

Setup the Arduino IDE for the ESP32 platform

The following instructions originate from here

  1. Install the current version of the Arduino IDE (at least 2.0).
  2. Open the Boards Manager and install the esp32 platform (by Esspressif Systems).
  3. Select your ESP32 board from the Tools -> Board menu after the successfull installation.
    • E.g. ESP32 Dev Module

Setup the required libraries

We'll be installing the following libraries using the library manager included with Arduino IDE:

Additionally to use the onboard screen we will install the TFT_eSPI libray using the instructions below

Once done, it is good to restart the Arduino IDE.

TFT_eSPI library installation

  1. Go to TTGO T-Display's Github Repository
  2. Copy the Folder TFT_eSPI to your Arduino library path
    • On Windows, this is by default C:\Users\Your User Name\Documents\Arduino\libraries

Launch the CO2 Monitor

  1. Open the Arduino IDE.
  2. Go to File -> Examples -> Sensirion Gadget BLE Lib -> Example3_SCD30_BLE_TTGO_Gadget.
  3. Make sure the ESP32 is connected to your computer.
  4. Press the Upload button on the top left corner of the Arduino IDE.

Monitor Setup

Value plotting on your Computer

To verify that everything is working fine, open the Serial Plotter, while your ESP32 ist still connected to your computer to see the sensor values measured by the SCD30 sensor:

  1. Go to Tools -> Serial Plotter
  2. Make sure on the bottom left corner 115200 baud is selected, as depicted in the image below

Monitor your CO2 levels via Mobile App

Download the Sensirion MyAmbience app to monitor your CO2 levels, download history values and export and share the data with your friends.

Note that on Android devices the Location services need to be enabled and the corresponding permissions granted to the application. This is required to allow the app to scan for nearby Bluetooth devices. This is a requirement of the Android OS for Bluetooth scanning. The app itself does not use your location.

PlatformIO Support

The folder Example3_SCD30_BLE_TTGO_Gadget contains a platformio.ini file which allows you to use PlatformIO instead fo ArduinoIDE if you wish to do so.