AddOhms #15: Pull-Up Resistors (and buttons)
The latest AddOhms looks at why you need a pull-up resistor when using push-buttons. This video goes into what happens when you leave a pin floating, what a floating pin means, and …
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Blink without delay() explained line-by-line
Making the move to millis()-based code can be daunting. You have to rethink your logic, implement flags, program a state machine — and more importantly, start using millis(). …
Read MoreMicrocontroller state machine with enum tutorial
Flag variables are great, and totally not evil, when you just have two states: ON or OFF. What about when you have multiple states? Is there an option better than creating multiple …
Read MoreBenchmarking Arduino's digitalWrite() with a Logic Analyzer
Recently I picked up a device called Logic from Saleae. It’s a 4-channel USB-based logic analyzer. While learning how the simple, but effective, UI works I ran some timing …
Read MoreEngineers
Found this one while going through some old files. One of my favorite volunteering activities is introducing kids to engineering. After judging a FIRST competition, I learned about …
Read MoreFlag variables are not evil (for Microcontrollers)
Getting programming questions answered on the internet can be problematic. Programmers love to have opinions, stick to those ideas, and express them to you even when their opinion …
Read MoreP-Channel MOSFET Tutorial with only Positive Voltages
On every page of my blog, you might notice a chat window. If I’m not busy, we can chat in real-time. If not, the messages come to me by email. Here’s one I got from Matt the other …
Read MoreWhich Arduino Starter Kit is the Best?
The other day my friend called me up. He told me how much he missed building circuits and wanted to start again with the Arduino. So he asked me “which Arduino starter kit is the …
Read MoreCheck out the 240p Test Suite
Learned about it in this video from the YouTube Channel My Life in Gaming. Some of their videos are a bit more technical than the general “retro review” style, which is why I …
Read MoreThe Bernoulli Box - Where Physics Met Storage
Back in the 1990s, a 1.44mb floppy disk was a reasonable storage size for most documents. For bigger documents or backing up an internal hard drive, other options were necessary. …
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