BalkonController

ESP8266 Irrigation control with 4 + 1 valves, a pump and as bonus RGB/White LED-Strip

This is work in progress and there is no release yet! However, it already works fine for me.

Software

Building

• Build with platformio. platformio.ini contains dependencies to necessary libs.
  • Configured to use with Eclipse
  • or use command line: pio run

Features

• Able to switch valves and main pump and/or main valve over MQTT according to Homie Convention using a PFC8574 I/O extension.
• Automatic mode (Proof of concept, under development) using the Automaton framework
• OpenHAB integration possible.
• 4 PWM outputs, configured for RGB led strip + white led strip.
• Support for BMP180 pressure and temperature sensor
• Logging over MQTT (Thanks to the new AsyncMQTT library for ESP)

Hardware

Overview

• ESP8266 ESP-ADC DIL18 (http://wiki.in-circuit.de/index.php5?title=ESP8266EX)
• IO-Extension PCF8574 (I2C)
• BMP180 Temperature & Pressure sensor (I2C)
• 2 Relais Module
• ULN2803
• DC/DC Converter (set to 12V->3,3V)
• Waterpump 12V (actually 24V but works fine with 12V)
• 4x magnet valve
• 1x magnet valve
• IP68 Case
• various WAGO clamps
• CP1202 for programming

Wiring

• I2C-Bus on PINs 4/5
• BMP180 and PCF8574 connected to I2C
• ULN2803 (for LED PWM) connected to GPIO 12, 13, 14, 16
• Other 4 inputs of ULN2803 connected to Pin 3,4,5,6 of PCF8574
• Relais input (optocoppler) connected to Pin 1 & 2 of PCF8574
• COM of PCF8574 connected to 12V supply
• 1N4001 connected from each NO output of Relais to GND (Cathode at NO) (Freewheel diode - absolute mandatory!)
  • ESP8266 is extremely sensitive to distortions on power supply (VCC / GND). Without the diodes I experienced resets even when switching on the relays and even with seperated 12V power supply for the relais.

OpenHAB integration

TO DO! (works for me, but not yet published. To be documented here or in the Wiki.)