See how a simple voltage divider circuit can be used to shift 5 volts down to 3.3 volts – two common voltage levels used in digital devices.
- [Instructor] When interfacing between two devices…that operate at different voltages,…we need a way to shift from one voltage level to another.…For example, if I wanted to use an Arduino microcontroller…that operates at five volts…and have it talk to an accelerometer chip…that operates at 3.3 volts,…I need a way to convert…the five volt signal from the Arduino…down to a 3.3 volt signal for the accelerometer chip.…Many digital devices either operate at five or 3.3 volts.…
So, it's common to need to shift…between those two voltage levels.…When shifting from a higher to a lower voltage,…making a voltage divider with two resistors…is often the simplest solution.…All I need is a pair of resistors…whose ratio will divide a five volt input…down to around 3.3 volts.…In this case, the ratio between the output 3.3 volts…and the input five volts is approximately 2/3.…So, based on the voltage divider equation,…I'll need to select resistors, such that…R two divided by R one and R two…is equal to 2/3.…
If I create a voltage divider…
- 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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