An ESP32 dev module from China running Espressif Arduino framework, powered by Platform.io. This device connects to HomeAssistant REST API to get sensor readings from my home.

Specs:

An ideal storm was brewing. I was mildly sick, bored and had a couple of long-forgotten ESP32 microcontrollers in the drawer. Taking a career shift into management inspired me to write code for fun!

• Fully open-source
• 3D printed case (SOON!)
• ESP deep sleep support
• ESP touch support
• Non-blocking loop/Timer based
• SSD1306 0.96" OLED display
• Supports calling multiple REST API endpoints using the khoih-prog/AsyncHTTPSRequest_Generic library
• Low-memory footprint JSON handling using the bblanchon/ArduinoJson library
• NTP time synchronization

• Displays time, date and date of week
• Displays inside sensor reading and outside temperature attribute from HomeAssistant
• Displays animated icon when connecting to WiFi
• Uses animated WiFi icon when displaying WiFi RSSI
• Multiple separate pages of UI - Setup/Connecting to WiFi, normal operation and entering sleep
• Internal webserver for configuration
• Displays stock ticker current price (SOON!)

Clone this project and open it as a Platform.io project. Create a srcsecrets.h file under src/ directory and set your own values for SSID, WiFi password, HomeAssistant API URL(SSL is supported), HTTP Auth header and HomeAssistant Entity ID's:

static const PROGMEM char SSID[] = "ssid";
static const PROGMEM char PASSWORD[] = "password";
static const PROGMEM char API_URL[] = "http://homeassistant.ip:8123/api/states/";

static const PROGMEM char AUTH_HEADER[] = " Bearer MyToken";

static const PROGMEM char IN_SENSOR_ID[] = "sensor.id";
static const PROGMEM char OUT_SENSOR_ID[] = "sensor.id";