Blind

An ESP8266 based blind controller, to control (for example) a window blind for a skylight. I recently replaced this piece of custom coding with esphome and a cover-endstops configuration. See here for more information on that. Below is the original arduino project.

Features

• Control
  • Open blind until fully opened
  • Close blind until fully closed
  • Stop open/close action by clicking close/open once
  • Timeout on close/open actions
• Webinterface
  • Control
    • open
    • close
    • stop
  • Configuration
  • Detailed Device state
• MQTT integration
  • publish state (UNKNOWN/OPEN/CLOSING/CLOSED/OPENING)
  • receive commands (open/close/stop)
  • LWT-support (Online/Offline)
• Syslog & serial logging

Hardware

• 2 * IKEA plisse curtain (ikea)
• ESP8266 / WeMos D1 mini (banggood)
• H Bridge motor driver (L298n, banggood)
• Micro switches (detect open/closed position)
• 3D printer timing belt (for example: this )
• 12V DC Motor with 5mm shaft (dx.com)
• 12V DC power adapter
• various bits and pieces (bolts, screws, wood, fishing wire)

Connections / Schematic

ESP8266:

• D1/GPIO5 --> Closed switch
• D7/GPIO13 --> Open switch
• D3/GPIO0 --> L298N IN1
• D4/GPIO2 --> L298N IN2
• D5/GPIO14 --> do_open switch
• D6/GPIO12 --> do_close switch
• 5V --> L298N 5V out
• 0V --> L298N 0V

Switches: All switches connect to ground.

L298N:

• IN1 --> ESP D3
• IN2 --> ESP D4
• ENA --> bridged
• 12V --> Poweradapter
• 5V --> ESP 5V
• 0V --> ESP 0V
• M1 --> to dc motor
• M2 --> to dc motor

Switches:

• Closed: switch closed when blind is fully closed (outputs 0V when switch is closed)
• Open: switch closed when blind is fully open (outputs 0V when switch is closed)
• do_open: switch to open the blind (0V when switch is momentarily closed)
• do_close: switch to close the blind (0V when switch is momentarily closed)