Explore how to determine the resistance of a resistive sensor by inserting it into a voltage divider and measuring the voltage across it. Learn how to build a light detector circuit using a photoresistor and an Arduino microcontroller to detect whether a
- [Narrator] There are several types of sensors that change…their resistance based on the thing they're measuring.…For example, a photoresistor changes its resistance…based on the amount of light shining on it.…The resistance of a strain gauge…depends on how it's physically deformed.…And the resistance of a thermistor changes with temperature.…To read one of those sensors,…I need to measure its resistance.…Unfortunately, I often use these types of resistive sensors…in projects with microcontrollers,…which are not designed to directly measure resistance.…
But, microcontrollers often have…analog to digital converters,…which are designed to easily measure voltage.…So, I need a way to convert the resistance of a sensor…into a voltage that I can read with my microcontroller.…And the simplest way to do that is with a voltage divider.…To measure a resistive sensor,…I'll create a voltage divider with the top resistor, R1,…being a known constant value.…And the bottom resistor, R2,…is the resistive sensor which has a variable resistance.…
- 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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