Simple shower controller

 Controller provides control over shower water flow as well makes hot water piping purge to pump cooled water and provide almost immediate comfortable water temperature from the head shower.

 

Shower controller 

 

Shower control design.

Functions:

• Hot water pipes prime, draining water from hot water piles back to the tank (to save water)
• Shower On/Off  by button press (may be connected to floor switch)
• Limiting water flow to 1 minute per one button activation. 

Hardware design and firmware files link 

 Normal operation

Indicator:

• Indicator is  Off  - no power provided to controller.
• Low brightness Red light  - Shower off, controller is functional. (HOLD mode)
• Amber light - Controller is priming hot water. (PRIME mode)
• Green light - shower is ready to use (READY mode)
• Green slow blinking - Shower is active (OPEN Mode)
• Green fast flashing -  10 sec to cut off. (FINISHING mode) (pressing button will restart timer)

In HOLD mode (Low brightness Red light)

• Short press  - Start priming

 In Priming mode (Amber light)

• Short press  - Stop priming go back to OFF.

In Ready mode 

• Short press <1sec  - Open/Close shower. (switch between READY and OPEN states)
• Press and  hold (for a second) - Switch controller to HOLD

In OPEN mode 

• Short press <1sec  - Open/Close shower. (switch between READY and OPEN states)
• Press and  hold (for a second) - Stop shower and switch controller to HOLD

In  FINISHING mode 

• Short press <1sec  - Restart timer for another minute. (switch to OPEN state)
• Press and  hold (for a second) - Stop shower and switch controller to HOLD