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DANGLER. A 555 TIMER PROJECT FOR KS3/4 DEVELOPED BY WWW.AJBOX.CO.UK FOR WWW.NELC.NET 2010. WHAT IS A DANGLER ?. An electronic circuit A way to make things move A variation of a 555 Astable circuit The core of an Art project A way of developing electronic assembly skills.

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Presentation Transcript
dangler

DANGLER

A 555 TIMER

PROJECT

FOR KS3/4

DEVELOPED BY

WWW.AJBOX.CO.UK

FOR

WWW.NELC.NET

2010

what is a dangler
WHAT IS A DANGLER ?
  • An electronic circuit
  • A way to make things move
  • A variation of a 555 Astable circuit
  • The core of an Art project
  • A way of developing electronic assembly skills
how it works 1
HOW IT WORKS - 1
  • Battery powers the circuit and a motor
  • 555 chip controls the charge on a Capacitor
  • When Capacitor voltage is low (3 volts), 555 switches so the Capacitor charges up
  • When Capacitor power is high (6 volts), 555 switches so the Capacitor Discharges
  • Length of time to charge and discharge Capacitor is set by a couple of variable resistors
how it works 2
HOW IT WORKS - 2
  • 555 chip uses the capacitorcharge to decide when toswitch its output pin (3) on
  • When Capacitor is CHARGING, output pin 3 ‘sources’ current, lighting the RED LED
  • When Capacitor is DISCHARGING, output pin 3 ‘sinks’ current, lighting the Green LED AND turning the motor
pcb layout with components
PCB LAYOUT – WITH COMPONENTS

In the FULL version, everything is joined to a single circuit board including the battery and motor

In the CIRCUIT

Version, only the

Main components

Are ‘Onboard’

pcb layout without components
PCB LAYOUT – WITHOUT COMPONENTS
  • This view shows the full PCB as it would appear if made industrially
  • Notice it has a white ‘silkscreen’ layer to show where components are to go
  • It also has holes and cut-outs to hold components and fix the motor in place, these would be drilled and cut by robots
  • These PCB’s are expensive to make in small quantities
pcb layout with components1
PCB LAYOUT – WITH COMPONENTS
  • This view shows the ‘mask’ layer
  • It is used to create the copper tracks that carry the electricity round the circuit
  • The final copper tracked PCB can be created by chemical etching or cutting processes, from this mask
  • All black areas on the mask will end up as copper areas so it is important to get it EXACTLY right
mobile design tips
MOBILE DESIGN TIPS
  • Keep your Mobile lightweight and balanced
  • Dangler has low power so will not turn heavy objects
  • Think about using shapes and colours that look very different from varying angles
  • Sharp mobiles are a Health and Safety risk
slide11

This is the last slide of this presentation about the Dangler project

Lots more details are included in the worksheets, videos and guides accompanying it

Please go to www.nelc.netfor a free copy of this projects files

DESIGNED, DEVELOPED AND PRODUCED BY WWW.AJBOOKER.CO.UK FOR NELC - 2010