1 / 15

Electronics and Control

Technology. Electronics and Control. Electronics and Control. The 555 timer is an 8-Pin D.I.L. Integrated Circuit or ‘chip’. Notch. Pin 1. What it looks like. Best treated as a single component with required input and output. OUTPUT. PROCESS. INPUT. Electronics and Control.

gnatoli
Télécharger la présentation

Electronics and Control

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Technology Electronics and Control

  2. Electronics and Control The 555 timer is an 8-Pin D.I.L. Integrated Circuit or ‘chip’ Notch Pin 1 What it looks like

  3. Best treated as a single component with required • input and output OUTPUT PROCESS INPUT Electronics and Control • Operation: • Contains 25 transistors, 2 diodes and 16 resistors • Maximum operating voltage 16V • Maximum output current 200mA If you input certain signals they will be processed / controlled in a certain manner and will produce a known output.

  4. Electronics and Control What the 555 timer is used for: • To switch on or off an output after a certain time delay i.e. • Games timer, Porch light, Childs mobile, Exercise timer. • To continually switch on and off an output i.e. • Hazard warning lights, Soft toy, Bicycle indicators. • As a pulse generator i.e. • To provide a series of clock pulses for a counter.

  5. Electronics and Control • Digital Terminology: • To use the 555 timer correctly you have to be aware of the correct terminology: • Monostable Time • Astable Time

  6. Electronics and Control • MONOSTABLE: This is a system which has only one stable state. It can be made to change but it will always return to its original stable state. A spring operated push button switch is an example of this. Monostable circuits are used as timers and as a single pulse generator.

  7. Electronics and Control Monostable Circuit

  8. Electronics and Control Monostable PCB circuit layout: Component list: R1= 33k(Or/Or/Or) R2= 1k (Br/Bl/Re) R3= 470(Ye/Vi/Br) R4= 470(Ye/Vi/Br) 2 No. LEDs SW1= Toggle Switch SW2= Tactile Switch 555 IC 3No.Terminal Blocks

  9. Electronics and Control • ASTABLE: This is a system which has no stable state. It changes from one state to the other all the time. A pendulum swings from one side to the other continuously. Astable circuits are used to flash lights or sound a loudspeaker. It can act as a square wave oscillator

  10. Electronics and Control Astable Circuit

  11. Electronics and Control Component list: Astable PCB circuit layout: R1 = 470(Ye/Vi/Br) R2= 1k (Br/Bl/Re) R3= 470(Ye/Vi/Br) VR1= 100K SW1= Toggle Switch C1=10uF Capacitor 2 No. LEDs 555 IC With VR1 set at 68K flash rate = 1 per sec

  12. Electronics and Control Components Astable Project Board R1=100 ohms R2=100 ohms R3=100 ohms R4=2200 ohms R5=1K ohms VR1=100k C1=10uF Q1=BC 337-16 D1=1N4148 SW1=Toggle

  13. Electronics and Control Warning signal: 4 LEDS flash simultaneously

  14. Electronics and Control Buzzer and 4 LEDs Oscillate ON/OFF – Lorry Reversing

  15. Electronics and Control Theme : A Safe Environment Monostable: Egg Timer : Food / Electrical safety Bath / Oven Timer Astable: Hazard / warning lights / school crossing Bicycle indicators Burglar Alarm Steep Gradiant Indicator Personal Alarm

More Related