Sub
System |
Processes
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See
Inputs
See Outputs |
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High
Gain Transistor Drives low power output devices. |
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High
Gain Transistor
- Inverter Makes its output voltage opposite to its input voltage. |
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High
Gain Transistor
- Logic Buffer Provides a digital output that switches between low and high logic levels. |
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Darlington
Pair Transistor - High
Gain High Power Amplifier Buffer to drive higher powered output devices. |
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Darlington
Pair Transistor - Electronic
Switch Turns on an output subsystem or P8 when a rising voltage has reached a certain level. |
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RC
Timer
- Delay unit / Timer Creates a variable short delay before something turns on or turns off. |
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RC
Timer
- Analogue Event Counter Makes a voltage steadily rise according to the number of times an input has switched on and off. |
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P3 |
RC
Timer - Frequency to Voltage converter Converts a pulsing input signal into a steady voltage (this is known as an integrator). |
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P4 |
Thyristor
- Circuit Latch Turns a process or output device on permanently once it has been triggered. It may be reset. |
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P4 |
Thyristor
- Memory Store Indicates, until reset, if an event has taken place. |
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P5 |
Output
Transistor - Power Amplifier Buffer used to supply more power/current to an output device or "switch on" another Process Subsystem. |
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P5 |
Output
Transistor
- Inverter Converts the "sourcing" output of a process module into a "sinking" output. |
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P6 |
Op
Amp Comparator - Signal Comparer
Compares a sensor's output voltage with a reference voltage and "switches on" if it is greater. |
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P6 |
Op
Amp
Comparator
- Analogue to Digital Interface Takes a varying analogue input voltage and produces at its output a signal that is either a logic "high" or a logic "low". |
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P7 |
555
Astable - Clock/Pulse Generator
Produces a pulsing signal that turns on and off at a chosen rate or frequency. |
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P7 |
555
Astable - Alert Controller Repeatedly switches a warning device on and off. |
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P7
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555
Astable - Variable Tone Generator Generates tones with a wide range of frequencies. This device can be set up to produce musical notes. |
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555
Monostable - Timer/ Momentary Latch Switches an output or process subsystem on for a short specified time (manually resettable during this period). |
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P8 |
555
Monostable - Switch Debouncer
Gets rid of the multiple pulses produced within a switch when it is operated. |
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Sub
System |
Outputs
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See
Inputs
See Processes |
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OP1
Sourced Sinked |
Filament
Lamp |
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OP1
Sourced Sinked |
Light
Emitting Diode Use as a visual indicator to show if something is on or off, or if something has happened. |
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OP1
Sourced Sinked |
On/Off
Flashing L.E.D.'s Flashes two LED's on and off alternately to get attention. |
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OP1
Sourced Sinked |
Piezo
Sounder (variable tone) Used to produce a wide range of quiet tones or musical notes. |
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Buzzer
(mechanical fixed tone)
Produces a clearly audible alerting sound. |
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Solenoid
Use to make electronic locks or to move something in and out. |
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Electromagnet Picks up materials that are Ferrous using a magnetic field. |
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OP2 |
Electromagnetic Counter A pulsed counter that registers events or simply counts up. |
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D.C
Motor 9-12 Volt Drives medium torque motors with "smoothing" against noise and protection against "Back emf". |
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OP2 |
D.C.Motor
3 Volt Drives small low torque motors with "smoothing" against noise and protection against "Back emf". |
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Mini
Loudspeaker 64 ohm Produces a wide range of clearly audible tones when supplied with a pulsing signal. |
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OP2 |
Piezo
Siren Alarm A siren which produces an ear piercing warbling sound. |
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OP3 |
Relay
(Double Pole Double throw D.P.D.T.) Allows seperate control of two different electrical circuits. They power up to 5 amp/ 24volt. |
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OP3 |
Motor
Reverser Changes the direction of rotation of a medium torque motor by the use of a relay. |
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See
Inputs
See Processes |
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Sub
System |
Input |
See
Processes
See Outputs |
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Light
Sensor
- Light Dependent Resistor Detects when it has become brighter or if it is light. |
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Dark
Sensor - Light
Dependent Resistor Detects when it has become dimmer or if there is darkness |
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Heat
Sensor
- Thyristor (SCR)
Senses when a rising temperature has reached a certain point |
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Cold
Sensor
- Thyristor
(SCR)
Senses when a falling temperature has decreased to a certain level. |
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Moisture
Sensor
- Moisture Probe
Measures the dampness of a material or senses water. |
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Touch
Sensor Detects the touch of a finger. |
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Angle
Sensor
- Potentiometer Indicates when something has turned through a required angle. |
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IP2 IP3 |
Key
Switch - Latching Type Produces safety or security by the use of a key. |
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IP2 IP3 |
Micro
Switch
- Non Latching Type Used to detect the opening, closing, pushing, pulling of an object. |
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IP2 IP3 |
Push
to Break Switch - Non
Latching Type Detects if something has been let go or if an object has been removed. |
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IP2 IP3 |
Membrane
Switch - Push
to Make / Pressure Switch Responds to being hit, pressed, walked on or detects an object being put into position. |
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IP2 IP3 |
Magnetic
Switch - Reed Switch Detects a magnetic field avoiding the need for physical contact. |
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IP2 IP3 |
Slide
Switch - Latching
Type Operates when slid to the side. |
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IP2 IP3 |
Tilt
Switch - Non-Ltching Momentary Type Detects something falling or leaning over. |
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