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algorithim
a step-by-step precedure for solving a problem or accomplishing some end, especially by a computer
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analog signal
a signal having the characteristic of being continuous and changing smoothly over a given range, rather than switching suddenly between certain levels
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analog to digital
conversion of an analog signal to a digital quantity such as binary
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closed loop system
A control system that considers the output of a system and makes adjustments based on that output.
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data
Information encoded in a digital form, which is usually stored in an assigned address of a data memory for later use by the processor.
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digital signal
A system of discrete states: high or low, on or off, 1 or 0.
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digital to analog
Conversion of a digital signal to its analog equivalent, such as a voltage.
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electromagnet
A conductor wrapped around an iron core. The two ends of the conductor are attached to a power source. When current passes through the conductor, the iron core becomes magnetized.
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feedback
The return to the input of a part of the output of a machine, system, or process (as for producing changes in an electronic circuit that improve performance or in an automatic control device that provide self-corrective action).
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flowchart
A diagram that shows step-by-step progression through a procedure or system especially using connecting lines and a set of conventional symbols.
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input
Information fed into a data processing system or computer.
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interface
The place at which independent and often unrelated systems meet and act on or communicate with each other.
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microprocessor
The central processing unit that is generally made from a single integrated circuit.
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normally closed
The contact of a relay that is closed when the coil is de-energized.
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normally open
The contact of a relay that is open when the coil is de-energized.
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NTC Resistor
A negative temperature coefficient, also known as a thermistor, is a sensitive resistor whose primary function is to exhibit a change in electric resistance with a change in temperature.
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Open loop system
A control circuit in which the system output has no effect on the control.
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Output
The information produced by a computer.
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Photocell
A photo-sensitive resistor whose resistance decreases as the light striking the unit increases.
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Polarity
The type of charge an atomic particle has.
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Potentiometer
A switch that can provide variable motion control. It can vary the resistance within the switch, which affects both the current and voltage flowing out of the switch.
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Progammable Logic Controller
A specialized heavy-duty computer system used for process control in factories, chemical plants, and warehouses. Closely associated with traditional relay logic. Also called a programmable controller (PC).
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Reed switch
An electromagnetically operated switching device.
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Sensor
A device that responds to a physical stimulus (as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control).
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Subroutine
A subordinate routine; specifically, a sequence of computer instructions for performing a specified task that can be used repeatedly.
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Switch
A device for making, breaking, or changing the connections in an electrical circuit.
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Transistor
A solid-state switching device.
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