Auto capping (Spunding) is a function that user can specify time or gravity to “cap” the fermenter for starting of spunding.

Auto capping is enabled by assigning an actuator, a pin, in “Device Setup”. Currently, only three pins can be used on ESP8266. They are cooler, heater, and door pins, default to D7, D5, and D0(after v2.7).

The setting is the same as cooler or heater by assign the function to “Capper” and set correct PIN Type, inverted or non-inverted.

The capping condition can be time, gravity, or manually controlled. The control pane will be shown only when a Pin is assigned for it. The default state, after assigning the pin without further action, is Manual Open.

Note: to cap, BPL will set the PIN to “active”. Most of the solenoids are normal closed, which is closed with power supply while most mechanical relay modules are inverted, which means it “connects” when the signal is LOW. If you are using an inverted relay to control a normal closed solenoid, PIN Type will be “non-inverted” so that when BPL set the pin to High for Active, the relay will in OPEN state, and the solenoid will be CLOSE state, which means “caping” the fermenter. The following table illustrates the combination of relays and solenoid type.

Relay, SSR type	Solenoid Type	PIN Type	Solenoid Action
Inverted	Normal closed	Inverted	Active: open, inactive: close
Inverted	Normal closed	Not-Inverted	Active: close, inactive: open
Inverted	Normal open	Inverted	Active: close, inactive: open
Inverted	Normal open	Not-Inverted	Active: open, inactive: close
Not Inverted/SSR	Normal closed	Inverted	Active: close, inactive: open
Not Inverted/SSR	Normal closed	Not-Inverted	Active: open, inactive: close
Not Inverted/SSR	Normal open	Inverted	Active: open, inactive: close
Not Inverted/SSR	Normal open	Not-Inverted	Active: close, inactive: open

Active=”capped”.