Posts

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!”

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, but it does have some very nice improvements over the B.

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 heat sink.

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 music, lending his voice. I (JamesC4S) just did the video animation.

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 as a BJT and MOSFET. This is part 1 of a two part series, which looks at BJTs first.