Embedded Files
Project Description
Project Description
Have you ever wondered how we are able to send information across long distances to satellites or over oceans to other continents Laser communication systems encode information in the laser light by modulating its intensity. When the light hits the receiver, the changes in intensity are converted into an electrical signal and the information is recovered. The principle is used in Bluetooth, the internet, and cellphone communication.
In this activity, students will use the audio output from a cell phone, and transmit the signal via laser light to a solar cell receiver.
Project Notes
Project Notes
Transmission Module
Transmission Module
Converts digital electrical signal to laser light through amplitude modulation:
Accomplish amplitude modulation through a transformer:
Receiver Module
Receiver Module
Converts signal from laser light to digital electrical signal using a solar cell:
Anatomy of an Aux Cord
Anatomy of an Aux Cord
Wiring Techniques
Wiring Techniques
Jumper Wires
Twist-on Wire Connectors
Laser Safety Considerations
Laser Safety Considerations
- Do not stare into the laser beam.
- Do not point the laser at others.
- Carefully handle and be aware of where you are pointing the laser.
- Turn the laser off (by taking the batteries out) when you’re not using it.
Supply List
Supply List
Transmitter
Transmitter
Audio cable, 3.5mm, cut end: DigiKey P/N CA-2207
Audio transformer: Amazon, CynKen P/N EI14
Laser diode: Amazon, GeeBat P/N 80-141-10
Battery pack, AA, 3 cells: DigiKey P/N BH3AA-W
Jumper wires, female to female: Amazon SUNKEE 100pcs
Receiver
Receiver
Solar cell: Amazon 5V, 160mA 80x80mm
PVC pipe: McMASTER-CARR, P/N 4880K74
Audio cable, 3.5mm, cut end: DigiKey P/N CA-2207
Twist-on wire connectors, No. 22-14 gauge: Amazon 1,000pcs
Amplified speaker, example: RadioShack P/N 2771008
Circuit Diagram
Circuit Diagram
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