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2. Bang–bang control - Wikipedia

   en.wikipedia.org/wiki/Bang–bang_control

   In control theory, a bang–bang controller (hysteresis, 2 step or on–off controller), is a feedback controller that switches abruptly between two states. These controllers may be realized in terms of any element that provides hysteresis. They are often used to control a plant that accepts a binary input, for example a furnace that is either ...

3. Direct digital control - Wikipedia

   en.wikipedia.org/wiki/Direct_digital_control

   Direct digital control is the automated control of a condition or process by a digital device (computer). [1][2] Direct digital control takes a centralized network-oriented approach. All instrumentation is gathered by various analog and digital converters which use the network to transport these signals to the central controller.

4. Proportional–integral–derivative controller - Wikipedia

   en.wikipedia.org/wiki/Proportional–integral...

   Control loop feedback mechanism. A proportional–integral–derivative controller(PID controlleror three-term controller) is a feedback-based control loopmechanism commonly used to manage machines and processes that require continuous control and automatic adjustment.

5. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control to automotive coolant control. Thermostats are used in any device or system that heats or cools to a setpoint temperature. Examples include building heating, central heating, and air conditioners, kitchen equipment ...

6. Marine aquarium - Wikipedia

   en.wikipedia.org/wiki/Marine_aquarium

   A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only (FO), fish only with live rock (FOWLR), and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally rely on mechanical and chemical filtration.

7. Watchdog timer - Wikipedia

   en.wikipedia.org/wiki/Watchdog_timer

   A watchdog timer (WDT, or simply a watchdog), sometimes called a computer operating properly timer (COP timer), [1] is an electronic or software timer that is used to detect and recover from computer malfunctions. Watchdog timers are widely used in computers to facilitate automatic correction of temporary hardware faults, and to prevent errant ...