From 734ecd850ca551d2ba96a2271c826701a534ba14 Mon Sep 17 00:00:00 2001 From: Laura Hausmann Date: Tue, 30 May 2023 02:43:53 +0200 Subject: [PATCH] Update README --- README.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/README.md b/README.md index 1b2e381..81559c9 100644 --- a/README.md +++ b/README.md @@ -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)