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Basic ElectronicsBasic Electronics

Voltage (V or E): Potential difference between 2 points. Volts.• (+) - A lack of electrons• (-) – A surplus of electrons• When a circuit is formed, electrons will

flow to equalize out the 2 sides.Current (I): The measure of the flow

of electrons. Amps.Resistance (R): Opposition to

current flow. Ohms.Ohm's Law: I = V/R

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ResistorsResistors

Devices used to insert resistance, or oppose current flow. Used to limit current flow.

Color codes are used to indicate the value.

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From Appendix C

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The LEDThe LED

LED: Light Emitting DiodeDiode: Device which allows current

to flow in only one direction.To operate, is must be installed

correctly with respect to polarity.

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A regular LED can be damaged if current exceed 20mA (milliamps).

Apply ohm's law to find the resistor size that will limit current to 20mAwith a 5V supply.

I = V/R

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LED Circuit SchematicLED Circuit Schematic

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The BreadBoardThe BreadBoard

Breadboards are used to make connections between devices.

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Building the CircuitBuilding the Circuit

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Pictorial or Wiring DiagramPictorial or Wiring Diagram

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Code to Blink LEDsCode to Blink LEDs

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TaskTask

Perform Chapter 2 up to this point (page 52), including "Your Turn- Blink the other LED"

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Additional – The Speaker/BuzzerAdditional – The Speaker/Buzzer

A small piezoelectric speaker is included with your kits.

A frequency can be sounded on it using the FREQOUT command.FREQOUT pin, duration, frequency• pin: Pin it is connected to.• duration: Length of time in milliseconds.• frequency: Frequency to play,

measured in Hertz (Hz).

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Sound the Speaker for 1 second at 1000Hz

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GroupGroup TaskTask

Write a program that will:• Display in DEBUG Window

"Stop! Police!"• Turn ON P12 LED• Sound a tone for ½ second at 1000Hz• Turn OFF P12 LED• Turn on P13 LED• Sound a tone for ½ second at 2000Hz• Turn off P13 LED• Repeat sequence

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Individual TaskIndividual Task

Develop a program to act as a "Ray Gun" movie prop. Use appropriate lights and sound sequences.