Logic Levels
Contributors:
bri_huang
bri_huang 
Resources and Going Further
Now that you've got the gist of one of the most common concepts in electronics, there's a world of new stuff to learn!
Would you like to learn how a microcontroller, like an Arduino, could read the analog voltage produced by a voltage divider? You can do so with our analog-to-digital converters tutorial.
Analog to Digital Conversion
February 7, 2013
The world is analog. Use analog to digital conversion to help digital devices interpret the world.
Learn how to use varrying levels of voltage to control other devices with our pulse width modulation tutorial.
You may also be interested in using voltage divider circuits and logic level converters to switch from one logic level to the next.
Serial Communication
Asynchronous serial communication concepts: packets, signal levels, baud rates, UARTs and more!
Voltage Dividers
Turn a large voltage into a smaller one with voltage dividers. This tutorial covers: what a voltage divider circuit looks like and how it is used in the real world.
Bi-Directional Logic Level Converter Hookup Guide
An overview of the Bi-Directional Logic Level Converter, and some example circuits to show how it works.
Qwiic Shield for Arduino & Photon Hookup Guide
Get started with our Qwiic ecosystem with the Qwiic shield for Arduino or Photon.
Single Supply Logic Level Converter Hookup Guide
The Single Supply Logic Converter allows you to bi-directionally translate signals from a 5V or 3.3V microcontroller without the need for a second power supply! The board provides an output for both 5V and 3.3V to power your sensors. It is equipped with a PTH resistor footprint for the option to adjust the voltage regulator on the low side of the TXB0104 for 2.5V or 1.8V devices.
PCA9306 Logic Level Translator Hookup Guide (v2)
A quick primer to get you going with the PCA9306 Logic Level Converter - a dedicated I2C translator.
Or add a transistor or relay to control devices operating at higher voltages like the tutorials listed below!
LED Light Bar Hookup
A quick overview of SparkFun's LED light bars, and some examples to show how to hook them up.
Transistors
A crash course in bi-polar junction transistors. Learn how transistors work and in which circuits we use them.
Beefcake Relay Control Hookup Guide
This is a guide for assembling and basic use of the Beefcake Relay Control board
Internet of Things Experiment Guide
The SparkFun ESP8266 Thing Dev Board is a powerful development platform that lets you connect your hardware projects to the Internet. In this guide, we show you how to combine some simple components to remotely log temperature data, send yourself texts and control lights from afar.
References
- Voltage: 3.3 vs 5
- Migration From 3.3 V to 2.5 V Power Supplies for Logic Devices
- Logic Threshold Voltage Levels
- Transistor–transistor logic
- 3V Tips 'n Tricks
- 5 V TTL and CMOS Input and Output Voltage Levels
- For a more "in-depth" look at why 3.3 V was chosen as the next lowest voltage level, check out this forum discussion.