Propeller Clock

Better Essays
"Propeller Clock" Mechanically Scanned LED Clock
Seven light emitting diodes spin, giving the illusion of numbers in the air

An Overview:

Top View Side View

How this clock works:
A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a 7 by 30 array of LEDs. It is an illusion, but it works nicely.

To build this clock, few things are needed, including: 1. Skill with motors and mechanical things. 2. Prior electronic experience. 3. A dead VCR or floppy drive or other source of a suitable motor and miscellaneous parts. 4. A programmer that will program a PIC16C84 or 16F84 microprocessor.
Schematic Diagram:

The Propeller Clock Parts List:

1. Capacitors: • C1, C2 - 33pf ceramic • C3, C6 - 0.1uf ceramic • C4 - 47uf electrolytic • C5 - 47,000uf supercap(memory cap)

2. Diodes: • D1-D7 - light emitting diodes • D8-16 - 1N4001 general purpose 1amp rectifiers

3. Resistors: • R1 - 120 ohm DIP array or seven 120 ohm resistors • R2-R6 - 10k ohm

4. Misc: • J1 - three terminal Berg connector • SW1-SW3 - normally open pushbutton switches • U1 - PIC16C84, PIC16F84 or PIC16F84A • XTAL1 - 4MHz crystal • MOTOR - Sharp RMOTV1007GEZZ

Note: U1 to be programmed with mclock hex file

A full description how to build it:

Step One: Mangle a Motor:

Find a VCR, perhaps a Sharp or a Samsung, with a flat reel motor. The motor I have is marked JPA1B01, but Sharp knows it by the number RMOTV1007GEZZ. Take it apart without mangling the brushes (there are little holes to slip a paperclip into to move the brushes out of the way), and notice that it has one ball bearing and one sleeve bearing.
Knock the sleeve bearing out of the case and glue or solder it to the other end of the motor, as an extension of

You May Also Find These Documents Helpful

  • Satisfactory Essays

    propeller clock

    • 596 Words
    • 3 Pages

    PROPELLER CLOCK OBJECTIVE :- In this project, our aim is to use PIC or 8051 microcontroller to control a row of LEDs to function it as a clock. ABSTRACT :- The Propeller Clock is an electronic device which has a series of LEDs on board that rotate with the help of a motor to give an illusion of a watching a clock ( Digital or Analogue ). This requires a DC motor which rotates the PCB connected to it with sufficient speed so as to create the illusion. The LEDs are connected to a microcontroller…

    • 596 Words
    • 3 Pages
    Satisfactory Essays
  • Powerful Essays

    Propeller

    • 2442 Words
    • 10 Pages

    ELECTRICAL ENGINEERING – Vol. III - Direct Current Machines - Edward Spooner DIRECT CURRENT MACHINES Edward Spooner The University Of New South Wales, Australia. Keywords: Electric machines, dc motor, electromagnetic induction, Faraday 's Law, commutator. Contents U SA NE M SC PL O E– C EO H AP LS TE S R S 1. Introduction 2. Magnetism and Electromagnetic principles 2.1. Permanent Magnets 2.2. Magnetic Field around Conductors 2.3. Magnetic Field around a Coil 2.4. Electromagnets…

    • 2442 Words
    • 10 Pages
    Powerful Essays
  • Powerful Essays

    History of the Propeller

    • 1561 Words
    • 7 Pages

    The aircraft propeller looks like a simple mechanism to the uneducated individual. To the educated, an aircraft propeller represents the highest sophistication in aerodynamics, mechanical engineering and structural design. This report will touch on the history of the propeller, from early pioneers/experiments, advancement during/after the war, all the way up to current applications of the propeller. The creation of the propeller can be traced back to Leonardo da Vinci. Da Vinci’s “helical screw”…

    • 1561 Words
    • 7 Pages
    Powerful Essays
  • Good Essays

    Q400 Propeller

    • 3757 Words
    • 22 Pages

    Dash8 - Q400 - Propeller 1. General The propeller control system consists of the following components: • • • • • Propeller Electronic Control (PEC) Unit Propeller Pitch Control Unit (PCU) High Pressure PCU Oil Pump and Propeller O/S Governor Units (referred to as overspeed governor) Propeller Feathering Pump Propeller System Sensors The function of the propeller system is to modulate the propeller blade pitch to control the propeller speed in flight constant speed modes and in reverse, and to…

    • 3757 Words
    • 22 Pages
    Good Essays
  • Good Essays

    Propeller Systems and Performance The accident investigator has to understand the primary and secondary systems and components of the turbine engine, including the induction, fuel delivery, fuel metering, water injection, ignition, lubrication, starting, electrical, charging, cooling, exhaust, instrumentation, engine overheat, and fire detection systems. The investigation of the turbine engine induction system focuses on the engine performance and the scheduling of air and fuel…

    • 902 Words
    • 6 Pages
    Good Essays
  • Powerful Essays

    Propeller Display

    • 6018 Words
    • 25 Pages

    having a little electronics knowledge, can take care of this. All the synchronizing can be implemented through software. First of its kind, made using the 20-pin 8051 series microcontroller, this project use the principle of Space Multiplexing. This propeller display is mechanically scanned and displays the characters in digital format. Made from scrap it can be used anywhere and everywhere and the most amazing fact about this display is it’s crystal clear display. This display consists of just 8 bright…

    • 6018 Words
    • 25 Pages
    Powerful Essays
  • Satisfactory Essays

    clocks

    • 317 Words
    • 2 Pages

    Water clocks, along with sundials, are likely to be the oldest time-measuring instruments, with the only exceptions being the vertical gnomon and the day-counting tally stick.[1] Where and when they were first invented is not known, and given their great antiquity it may never be. The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon and in Egypt around the 16th century BC. Other regions of the world, including India and China, also have early evidence…

    • 317 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    The Clock

    • 1021 Words
    • 5 Pages

    A ‘clock’ is an instrument used to specify, record, and manage time. The word ‘clock’ comes from the French word “cloche” meaning bell, came into use when timekeepers were kept in bell towers in the Middle Ages. Historians do not who or when mankind “invented” a time-keeping device or a “clock”. Probably thousands of years ago when someone stuck a stick in the ground and saw a shadow of the sun move across the ground, known as the sundial. (Cummings, 1997-2012). After the Samarian culture…

    • 1021 Words
    • 5 Pages
    Good Essays
  • Powerful Essays

    Contra Rotating Propellers

    • 4553 Words
    • 19 Pages

    single propeller significantly. However, further increases in efficiency can sometimes be obtained from having two propellers in a contra- rotating configuration. Contra-rotating, also referred to as coaxial contra-rotating, is a technique whereby parts of a mechanism rotate in opposite directions about a common axis, usually to minimize the effect of torque. Examples include some aircraft propellers, resulting in the maximum power of a single piston or turboprop engine to drive two propellers in opposite…

    • 4553 Words
    • 19 Pages
    Powerful Essays
  • Good Essays

    Efficient Propeller Design | AbstractHow does a helicopter generate enough lift to fly? How does a speedboat get moving fast enough to pull someone on water skis? Here 's a project on designing propellers to do the job. ObjectiveThe goal of this project is to investigate how changes in chord length affect the efficiency of propellers.IntroductionA propeller, like an airplane wing, is an airfoil: a curved surface that can generate lift when air moves over it. When air moves over the surface of…

    • 2968 Words
    • 12 Pages
    Good Essays