Resistors on AddOhms by Bald Engineer

Picking Pull-Up Resistor Values | #25

Thu, 03 May 2018 08:51:00 +0000

A common question that comes up about pull-up resistors: what value do you pick and why not just use a piece of wire? In this follow-up electronics tutorial, the bald engineer looks at how to pick pull-up resistor values.

Show Notes

Pull-Up Resistor Tutorial (Episode 15)
AddOhms Discord Server
Arduino Internal Pull-Up Resistor Tutorial (baldengineer.com)
Chuck Norris On Pull-Up Resistors (baldengineer.com)

Pull-Up Resistors and Pushbuttons | #15

Mon, 07 Sep 2015 14:13:29 +0000

There is nothing more frustrating than a push button that seems to work at random. The good news is the fix is pretty simple: a resistor.

It may not seem obvious when you first start working with electronics but a “floating pin” doesn’t have a defined “high” or “low” level. Remember from the Analog and Digital video, that Digital Electronics has defined voltage levels. Well, when you don’t connect anything to the I/O pin of your microcontroller, the voltage level is undefined!

How Voltage Dividers Work | #13

Fri, 16 Jan 2015 21:04:12 +0000

https://youtu.be/EQtwsWJuUPs

Understanding voltage dividers means understanding Ohm’s Law. A common use for a voltage divider in most projects is to monitor a battery. Say you are powering your circuit with a 9V or 12V battery. Microcontroller boards don’t do well with those voltages.

In a future video, we’ll come back and look at more circuits that can use voltage dividers.

Episode Notes

Correction: There is a mistake around 3:00. I say “91 millivolts” and I should have said “910 millivolts!”