Bedroom Clock with ESP32 ⏰

Description

You can put this device in your bedroom and you won't be disturbed by the light of the display. The display is only activated when you move your hand in front of the device and then it automatically goes off again.

Features

• OLED display
• display turn on if you move your hand in front of it
• temperature and humidity sensor
• easy integration in own WiFi network (Hotspot settings-page)
• react dashboard
• REST API endpoint
• OTA updates

Demo

See demo on Youtube

Parts

• ESP32 DEV Board
• SSD1306 (I use a 2.42 inch version)
• HC-SR04
• DHT22
• MAX 98357A (audio module)
• speaker

Sketch

Wiring

Ultra Sonic Sensor (HC-SR04)

Pin on Sensor	Pin on ESP32
VCC	VIN (5V)
TRIG	GPIO 5
ECHO	GPIO 18
GND	GND

OLED Display (SSD1306 128x64) via SPI

Pin on Sensor	description	Pin on ESP32
GND		GND
5V		VIN (5V)
SCK/SCL	SPI	GPIO 14
MOSI/SDA	SPI	GPIO 13
RES/RST	SPI	GPIO 17
DC	SPI	GPIO 16
CS	SPI	GPIO 15

DHT22

Pin on Sensor	Pin on ESP32
1	3V3 (3V)
2	GPIO 4 (analog)
3	-
4	GND

MAX 98357A (Audio Interface)

Pin on Sensor	Pin on ESP32
LRC	GPIO 25
BCLK	GPIO 26
DIN	GPIO 22
GAIN	-
SD	-
GND	GND
Vin	Vin (5V)

SD Card Module

Pin on Sensor	description	Pin on ESP32
GND		GND
VCC		3V3 (3V)
MISO	SPI	GPIO 19
MOSI/SDA	SPI	GPIO 23
SCK/SCL	SPI	GPIO 18
CS	SPI	GPIO 5

Timezone configuration

First change variable timeZone to your timezone. See timezone list for the correct value.

Later I will include this setting also to the dashboard.

REST API endpoint

General

Get info

GET /api/info

Returning an JSON object with following data:

field	type	description
version	string	firmware version number
------	-----	------------
system.deviceId	string	unique ID of the device
system.freeHeap	number	the free heap in bytes
system.uptime	number	uptime since last restart of the device in seconds
------	-----	------------
fileSystem.totalBytes	number	total bytes of the FS
fileSystem.usedBytes	number	used bytes of the FS
------	-----	------------
network.wifiRssi	number
network.wifiQuality	number	quality of the WiFi connection in percent
network.wifiSsid	string	SSID of the current connected WiFi
network.ip	string	IP address of the device
network.mac	string	MAC address of the device
------	-----	------------
values.temp	number	temperature in °C
values.humidity	number	humidity in percent
------	-----	------------

Get settings

GET /api/settings

Return the settings.json

Change settings

POST /api/settings

Change settings. Send payload as JSON in body.

field	type	default	description
screenOnDistance	number (0 - 255)	18 cm	Specifies the distance from the ultrasonic sensor in centimeters from when the display should be switched on.
screenOnInterval	number	8000 ms	Specifies the time in milliseconds that the display stays on after motion detection.

Turn on Screen

POST /api/display

Turn on the display for the screenOnInterval time.

Restart device

POST /api/restart

Factory reset

POST /api/hard-reset

Reset device to factory settings.

Warning: all files (~settings) will removed from the device. Need setup for connecting to your WiFi.