Hydroponic Controller for flood and drain cultivation

A digital hydroponic controller based on PIC16F648A microcontroller clocked @ 4 Mhz.

Code was written exclusively in ASM and is no longer maintained.

• Controls an LCD 16x2 - HD44780 through a PCF8574 I2C expander. LCD contrast is digitaly adjusted through PWM modulation.
• Offers a fully functional multi line menu to navigate through the various functions.
• Implements I2C communication protocol through bit-banging.
• Keeps track of time and sets alarms by controlling the RTC DS1307 through I2C.
• Offers a cycle timer and ten absolute timers for scheduling flood and drain cycles.
• Controls two separate optocoupled inputs and outputs:
  • Inputs are connected to the water float switches.
  • Outputs utilize two 12v/220v - 10A DIN rail relays, for controlling the water pumps.

You can download code, schematic and gerber files from Githup Repo.