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esp8266-smartclock

We started designing and building a small clock that is connected to your local Wifi and controls your home using cheap 433Mhz power outlets. The ESP8266 operates as a relay to communicate with your power outlets.

Hardware

The total costs are around 25€:

  • NodeMCU board with the ESP8266 and an USB programmer
  • DHT11 or DHT22 (optional)
  • 433Mhz transmitter (XD-RF-5V)
  • 4x MAX7219 based 8x8 led matrix
  • 433mhz Wireless Remote Control Electrical Outlet Switch (example)
  • some wires

Schematic

Fritzing File

Features

  • opens an access point to enter your local Wifi SSID and password
  • customisable slots for your power outlets
  • custom brightness settings for the LED matrix
  • Read Data from a DHT11 temperature and humidity sensor and send it to a remote Host (for saving the data see: sensor.php)
  • NTP Time support
  • supports multiple Wireless Remote Control protocols (we are using the rc-switch library)
  • dyndns (using a get request on a given url every 10 minutes)
  • password-authentication for user from the internet (no https 😞)
  • OverTheAir Update

Development

Dependencies

Module last tested version
ESP8266 2.7.1
NTPClient 3.2.0
Adafruit_Sensor 1.1.3
DHT-sensor-library 1.3.10
LedControl 1.0.6
rc-switch 2.6.3
Time 1.6.0

Board-Settings (used)

  • Board: NodeMCU 1.0 (ESP-12E Module)
  • Builtin Led: 2
  • Upload Speed: 115200
  • CPU Frequency: 80Mhz
  • Flash Size: 4MB (FS:1MB OTA:~1019KB)
  • Debug Port: Disabled
  • Debug Level: None
  • lwIP Variant: v2 Lower Memory
  • VTables: Flash
  • Exceptions: Enabled
  • Erase Flash: Only Sketch
  • SSL Support: All SSL ciphers (most compatible)

Compile

arduino ./ESP_clock/ESP_clock.ino --verify --preserve-temp-files

Update via OTA

curl -u admin:admin -F "image=@$(find /tmp/arduino* -name 'ESP_clock.ino.bin')" esp8266/update

or via webinterface at http://esp8266/update

About

An IoT-Device based on NodeMCU-ESP8266, MAX7219 and DHT11

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