ESPHome components

Notes on using ESPHome and cheap, readily available electronic components.

• Overview
• Components
  • Sensors
  • Displays
    • HD44780 LCD display
  • Lights
  • Other
• References

Overview

Most of this is already documented by ESPHome, these are my own notes that also cover some frustrations and pitfalls -- as well as a reference guide for myself (and whoever else).

Components

• GPIO: Using GPIO pins for fun and profit.

Sensors

• ADC: Analog-to-digital
  • Potentiometer: Using ADC to read a Potentiometer.
• BME280: Barometric pressure + temperature + humidity
• BMI160: Accelerometer and Gyroscope
• PIR: Generic PIR motion sensor
• LD2410: mmWave radar presence sensor
• SGP30: CO₂ and (Total) Volatile Organic Compound Sensor
• SGP41: Volatile Organic Compound and NOx sensor
• PN532: RFID/NFC reader
• RCWL-0516: Doppler radar
• RG-9: Rain gauge
• VL53L0X: Time of Flight optical distance sensor

Displays

• HD44780: LCD display
• MAX7219: LED matrix
• PCD8544: Nokia 5110/3310 display
• SSD1306/SH1106: OLED display

HD44780 LCD display

I have some unusual model "2004A-V1.3". Based on the Arduino forum thread and the linked AliExpress page, this is probably an LCD module called SPLC780D that has an onboard I2C adapter/interface called AIP31066. Found a GitHub repo enjoyneering/LiquidCrystal_I2C with detailed info.

• Arduino forum: Funky 20x4 LCD with interesting circuitry
• Very similar: 20x4 LCD white on blue

Lights

• LED: Control LEDs, hardware PWM (pulse-width-modulation) with ESP32 ledc.

Other

• RF: Transmit and receive 433 MHz RF signals.
• IR: Transmit and receive infrared signals.

References