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
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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