Ph4705 et4305 digital sensors
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PH4705 & ET4305: Digital Sensors. Simple switches to data words Switch: micro-switch, reed relay, Hall sensor, optical switch….. Threshold or Set point detector Counting, timing, finding the frequency Sensors that generate data words directly

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PH4705 & ET4305: Digital Sensors

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Ph4705 et4305 digital sensors

PH4705 & ET4305: Digital Sensors

Simple switches to data words

  • Switch: micro-switch, reed relay, Hall sensor, optical switch…..

  • Threshold or Set point detector

  • Counting, timing, finding the frequency

  • Sensors that generate data words directly

  • Complex IC sensors that generate serial data or connect to a bus system


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PH4705 & ET4305: Digital Sensors

Switch

Input ON/OFF information

mechanical movement

micro-switch,

reed relay operated by a magnet

Hall effect sensor


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PH4705 & ET4305: Digital Sensors


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PH4705 & ET4305: Digital Sensors

Switch

Light Beams

LDR-light dependant resistor

Photo-diode

Photo-transistor

Slotted and reflective sensors


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PH4705 & ET4305: Digital Sensors


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PH4705 & ET4305: Digital Sensors

Logic Signal input

ON/OFF input

Compatible logic signal (voltage levels, available current)?

Interference and noise?


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PH4705 & ET4305: Digital Sensors

Threshold or Set Point Detection

Analogue input signal, detect when its value passes through a set point or threshold (in either direction)


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PH4705 & ET4305: Digital Sensors

Input

Zero crossing detector

Output

Potential

Divider Sets

Threshold

Threshold or Set Point detector

Threshold detector with hysteresis


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PH4705 & ET4305: Digital Sensors

Counting, timing, finding frequency

The required data derived from switch sensors may be:

number of pulses

time between pulses

width of pulse

frequency of pulses ………..


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PH4705 & ET4305: Digital Sensors

Data Words

Typical example is this optical coded disc used to detect angular position. Looking along a radius gives an 8-bit word or a resolution of 1/256.

(Looking at the pulse rate of, say, the outside markings will also yield speed.)


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PH4705 & ET4305: Digital Sensors

Complex IC digital sensor

Sensors system ICs that have signal processing and generate digital data as a serial data streams or connect directly to a microprocessor system data bus.

Examples: CCD digital camera sensor,

SHT75 temperature/humidity module


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PH4705 & ET4305: Digital Sensors


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