zotan/esp32-co2-scd4x
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Update README

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Laura Hausmann 2023-05-30 02:43:53 +02:00
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README.md
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@ -9,3 +9,6 @@ The main components here are wired up like this:
- The HD44780 16x2 display is connected to an I2C daughterboard, which itself is connected to +5V, ground, as well as the I2C bus pins of the ESP32, 22 for clock and 21 for data
- The SCD40/41 photoacoustic NDIR CO2 sensor is connected to +5V and ground for power and to pins 22 and 21 (ESP32 I2C_bus1; MH-Z19B side pins SCL and SDA respectively)
- A button to toggle the backlight is connected between pin 23 and ground
## Setup
The device will open a WiFi hotspot on first boot, connecting to which reveals a setup dialog for WiFi information, OpenWeatherMap API key & coordinates (this is for collecting pressure information to feed to the SCD4x sensor)