In this video, electrical engineer Barron Stone demonstrates his solution to the light-activated switch challenge, walking you thought his thought process from start to finish.
- [Instructor] This is how I worked my way to a solution for…the light activated switch.…I started by thinking of the wheatstone bridge as…two parallel voltage dividers.…Since I'll be taking a differential measurement…for the wheatstone bridge output,…the output voltage from the voltage divider…on side A will serve as a reference that's compared…against the output of the voltage divider on Side B.…I'm measuring the voltage across this gap with…the left half representing the positive side…and the right half being the negative side.…
For simplicity, I decided to make the left two…resistors on Side A constant and equal.…I chose to use 10 kiloohm resistors since I had…a bunch of them handy.…Since they are equal, the output of the left…voltage divider, which I've labeled as VA,…will be equal to one half of the input voltage…of the wheatstone bridge.…For this challenge, it doesn't really matter what…that input voltage is, since I only care whether the…differential output of the wheatstone bridge is…positive or negative.…
- Reading electrical schematics
- Building circuits on breadboards
- Reviewing types of static and variable resistors
- Reading resistor color codes
- Measuring resistance with a DMM
- Measuring resistive sensors with an Arduino microcontroller
- Making electrical signal measurements with an oscilloscope
- Measuring AC voltage with a DMM
- Understanding the time domain and frequency domain
- Designing passive low-pass and high-pass filters
- Reviewing reactive RC and RL circuits
- The relationship between capacitors and inductors
Skill Level Beginner
Learning to use MakerBot 3D Printerswith Kacie Hultgren1h 5m Appropriate for all
Learning Arduino: Pulse Width Modulationwith Rae Hoyt1h 16m Intermediate
1. Building Circuits
Read electrical schematics6m 25s
3. Resistive Circuits
4. Oscilloscope Measurements
6. Alternating Current
7. Electrical Signals
8. Reactive Circuits
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