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…
https://youtu.be/8ua7dkTLGII A first look at the new Raspberry Pi B+ and some highlights on the differences from the first models. The other day I got an interesting email. It offered me a raspberry pie. The sender claimed it was only a “B+”, but hey, who am I to turn down free pie!? Jokes aside… In this AddOhms episode, I give some first impressions of the new Raspberry Pi Model B+. It isn’t an all-new board,…
https://youtu.be/GrvvkYTW_0k Following up from Episode #10 on BJTs, this episode is focused on introducing MOSFETs. It is the longest video we’ve done yet, coming in just over 7 and a half minutes. There is a basic overview of how MOSFETs work, compared to a BJT. And something that is really important to consider: how hot is it going to get? So we go through how to calculate power dissipation and if you need a…
When asking questions in a forum, like the Arduino forum, it is important to Post Your Code! It is so difficult to help without seeing what you intended. This was a team effort from the members of the Arduino forum. First, all of the people who help answer questions, of which, there are too many to list. The real credit goes to wildbill and Grumpy_Mike. wildbill wrote the original lyrics and Grumpy_Mike put them to…
https://youtu.be/sRVvUkK0U80 The two most popular kinds of transistors you might use for a project are either BJTs or MOSFETs. With so many options, it was tough to pick just a few. We covered the 2n3904 in this video. What BJTs are your favorites and why? Leave a comment below. Transistors are electronic switches that are used to control things that would kill an Arduino, Raspberry Pi, or Beaglebone. There are two major types known…
One of the features of a channel page on YouTube is a trailer video. It’s a chance to introduce people who aren’t familiar with your channel. Subscribers won’t see it, only non-subscribers. To help explain AddOhms, we’ve created an introduction video. This replaces the first one where I introduced AddOhms from my lab. Since AddOhms is more about the drawing than a bald engineer on camera, I thought it made since to create an AddOhms-style…
https://youtu.be/px8cUUbxnr0 There have been so many good questions coming in lately that I decided to take a break from normal topics and answer 3. Not sure the right frequency yet, but will probably do this every couple of episodes/videos. Episode Notes Previous Episodes Mentioned: #8 Current Limiting Resistors http://addohms.com/ep8 #5 AC vs DC http://addohms.com/ep5 Apple Motion 5 http://www.apple.com/final-cut-pro/motion/
I posted my first AddOhms video on YouTube on March 9, 2013. While in Germany on business, I ended the work week with dinner with some local friends. On our way to dinner I got the following comment notification. View fullsize When I posted that first AddOhms video I had no idea how many more I’d make. In fact, I was afraid I’d run out of ideas after 3 or 4. With the success…
https://youtu.be/81zNcctopBI What was the first electronic component you played with? It was probably a LED. They’re fun to blink in patterns or learn to fade. Most projects (and products) use them for useful indicators. LEDs add magic to every electronics project. Often not understand is what else you need to make that LED work correctly. Learn what current limiting resistors do for LEDs and watch what happens when you don’t use one. The most common…
https://youtu.be/7vhvnaWUZjE Trying to decide between an Arduino or Raspberry Pi for your project? In this video we look at what the difference between the two boards are and talk about what kinds of projects each are best at. Episode Notes This one has been a long time in the making for two reasons. First, I spent some time creating an opening sequence for the videos. Thanks to everyone who helped me decide on the right…
