HW info

Board info

• LILYGO® 4M Byte (32M bit )Pro ESP32 OLED V2.0 TTGO Manufacturer data sheet
• TTGO LoRa32 OLED usefull fan page.

Sesnsor info

• Adafruit BME280

SW info

Development Environment

Prerequisities

• Python 3.7+
• Git
• CP210x USB to UART Bridge VCP Drivers
  • Download VCP for Win 7
• Visual studio code (optional)
  • Setting up Visual Studio Code for ESP32 IDF (FreeRTOS) (Contains references and advices for older version of ESP-IDF)
• Putty

Install toolchain and libraries

1. Clone this project somewhere e.g. ./cima-esp32-azure/
2. Create separate ESP toolchain and libraries folder e.g. ./ESP/

    mkdir ./ESP/
    cd ./ESP/

3. Clone ESP-IDF to folder from step 2. e.g. ./ESP/esp-idf/

    git clone -b release/v4.0 --recursive https://github.com/espressif/esp-idf.git

4. Clone ESP-Azure to folder from step 2. e.g. ./ESP/esp-azure/

    git clone --recursive https://github.com/espressif/esp-azure.git
    git submodule update --init --recursive

5. Clone ESP-IoT-solution from fork cima/esp-iot-solution to folder from step 2. e.g. ./ESP/esp-iot-solution/

    git clone -b feature/ssd1306_generic --recursive https://github.com/cima/esp-iot-solution.git

6. get Boost via Version 1.71.0 and unpack it to folder from step 2. E.g. ./ESP/boost_1_71_0/

7. ESP 32 toolchain v4.0 (incl. gcc, cmake, ninja) -- Windows Download esp-idf-tools-setup-2.3.exe see Standard Setup of Toolchain for Windows for more details a. Select your preinstalled GIT and Python b. When asked whether to download or use ESP-IDF select Use an existing ESP-IDF directory an navigate to the folder from step 3. c. When you asked Select Destination Location you can also point to folder from step 2 to have all the toolchain at one place.

8. Update file init_cmd.bat in this project (from step 1) so the first variable ESP_TOOLCHAIN_DIR contains the absolute prefix of your toolchain directory.

9. Fisrt build

    init_cmd.bat
    idf.py build

Development

Build & Flash

    idf.py -p COM5 flash

STDOUT over serial line over USB

1. Plug your Lily GO Oled to USB
2. Open Putty

• Connection Type: serial
• Serial Line COM5 (Based on where your board appears the number can differ)
• Speed 115200

Wi-Fi Networks, Certificates

• (./filesystem/connectivity/wifi.json) populate with wi-fi networks where your ESP will operate
• (./filesystem/connectivity/azure.json) populate with your azure account adresses

TODO: Certificates

• (./filesystem/identity/)

Dependencies details

ESP 4.0 (beta 2)

• Getting started ESP 4.0 (beta 2)
• ESP-IDF

    git clone -b release/v4.0 --recursive https://github.com/espressif/esp-idf.git

• ESP-toolchain 4.0 beta 2 Installer
  • python 3.6+
  • cmake 3.13
  • mingw32-make 3.82

Azure IoT SDK C for ESP

• ESP Azure IoT SDK

    git clone --recursive https://github.com/espressif/esp-azure.git
    git submodule update --init --recursive

and define environment variable named AZURE_SDK_C_PATH pointing to the above cloned directory.

• Azure IoT Hub example

BOOST

• Getting started with boost
• Ensure environment variable BOOST_ROOT that contain path to unpacked boost distribution.

Misc

• Disable FreeRTOS static allocation API set in sdkconfig.defaults
• Quartz & Bitrate settings

Adafruit drivers

Use ESP IoT Solution clone it with all submodules

    git clone --recursive https://github.com/espressif/esp-iot-solution.git
    git submodule update --init --recursive

and define environment variable named IOT_SOLUTION_PATH pointing to the above cloned directory.

In (./CMakeLists.txt) we use a little dirty trick where we only define and use those drives we care of because the rest is highly incompatible with ESP-IDF 4.0.

Deprecated

Arduino like

• clone with submodules https://github.com/espressif/esp-azure to c:/Users/z608328/AppData/Local/Arduino15/packages/esp32/hardware/esp32/1.0.1/libraries/esp-azure/
• Adafruit drivers for Arduino
  • Patch adafruit driver