Looking through my parts boxes, I have counted at least 15 distinct “Arduino boards” in my collection. Either they are variants of the Uno form factor or they have different processors from the 8-bit boards. That number easily goes to 30 if I include boards with just the “Arduino header” on them. This pile of microcontrollers got me thinking, how does anyone ever choose the right board?
For example, I have had several people tell me the ESP32 is the “ultimate Arduino.” But is it? Well, yes and no. Extra hardware you do not need can lead to complexity and unexpected behavior. When using an advanced module like the ESP32, it is important to learn how to use sleep modes to limit current consumption, especially for battery applications. But if you need WiFi, Bluetooth, I2C, SPI, UART, and high-performance processing, capacitive touch, GPIO, and analog inputs then the ESP32 is an obvious choice.
|Appearance:||How to pick from all the Arduino boards|
Learning to use a new oscilloscope can be daunting. In this video, I show 5 measurements you can make using just an Arduino as your DUT. Learn how to offset voltage, setup measurements, enable infinite persistence, save reference waveforms, AND trigger (and decode) serial signals. For this video, Rohde & Schwarz was kind enough to send me an RTM3004. This video is a follow-up from an ealier blog post which featured 6 scope measurements you can make with an Arduino.
Check out the AddOhms Episode 28 Show Notes for links related to the episode.
Making tutorial videos and project videos is a very different process. It is very easy to script a tutorial. In fact, I think it is a necessary step. Project videos, on the other hand, are more organic. In this project, I build a capacitive activated coin bank, based on this Coin Acceptor from Adafruit. It uses an MSP430 to do capacitive sensing and then a Pryamiduino to control the rest of the electronics. In the end, I do some classic AddOhms special effects to demonstrate how the project works. For detailed notes and design files, hit the button below for the element14 project page.
|Date:||August 24, 2018|
|Appearance:||Bank to the Future on element14 presents|
As promised, the Arduino team shipped the MKR 4000 VIDOR by the end of July. The graphical editor is still missing in action, but you can check out the board now. I received mine. In this AddOhms Live Stream, I turned it on and checked it out.
This video is a “working” live stream. Generally, I try to set up some demos and run through some canned actions. Not this time. I used the board once, on another computer. You get to watch how I attack a new board…live! Warts and all.
Key things I check out:
I’m writing up my experience so far, along with what I’ve learned. Until then, click below to see the 1-hour live stream.
This AddOhms episode is part 3 of the “design your own Arduino” series. In this one I populate a bare PCB, reflow solder it, debug a few issues, and load the Uno bootloader. Originally, I designed 2 versions of the board. One version contained an error that I planned to fix in the episode. Well, turns out, the “correct” board had two issues which were more interesting.
Check out the #27 show notes for links to a bunch of stuff in the episode, including the design files.
Interesting time code jump points:
Pretty often I am asked about how I create the AddOhms animations. Currently, I’m working on the final part of the DIY Arduino Series. In the first part, I showed the elements of an Arduino schematic. The second part showed an overview of the PCB design. Finally, I will take the finished board and explain how to turn it on the for the first time. Lucky for me, there was a “mistake” on the board. This error gives some context for the episode.
I needed to explain how the Arduino Uno’s (and Mega’s) “auto-reset” circuit works. I did a live stream showing how I created the animation sequence for this explanation. Well, I started to explain. After almost three hours of streaming, I was only about half-way through the one-minute explanation.
While long, I think the stream helps to illustrate the kind of work I put into my videos. Speaking of which, I need to get back to finishing this one.
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 a pull-up resistor value. Note that while focused on pull-up everything said in this video would apply to pull-down as well.
If you’re new to pull-up resistors, check out this longer Pull-Up Resistor Tutorial.
Autodesk released EAGLE 9. This new version continues the improvement that Autodesk has been providing since acquiring the infamous ECAD tool. There are three areas I look at in this AddOhms Livestream.
In the beginning, I use an old training class I wrote about five years ago when I was using EAGLE daily. It shows how to design a 555 flashing circuit from schematic to PCB. A follow-on class taught how to mill the PCB on a Shopbot. I might update the course and release it if I have time. The exercise class helps me find some surprises with EAGLE’s incremental improvements.
After that, I check out three new features. I also looked at the “Design Blocks” stuff which is a way to incorporate completed schematics like the Adafruit PowerBoost circuit. I need to come back and look at that function again later. Also, I am not positive, but I think that feature was introduced before 9.
The quick routing reminds of the old “follow me” option. You can select individual airwires, entire nets, or multiple signals to route interactively. Unlike the Autorouter, which routes the board as the whole. In the video, I build a simple 555-based PCB. I couldn’t try out routing multiple signals, like address and data for DDR memory. The value I see most from this feature is selectively routing your critical signals and then quick routing the remaining non-critical nets.
This informational window provides a clean break-down of many pieces of data. Need to know what layers a footprint use? How about the length of an entire net? In the video, I show that you can use this feature to verify all of your passive components have the same package style. The information is all there, Device Manager brings it to your attention.
Spoiler Alert: I really like the Breakout Feature. (For those that say I don’t smile in videos, I did this time.) Long story short, this is a shortcut to expand all of the pins for an IC. A great example is in the AddOhms Pyramiduino DIY PCB episode. In the beginning, you can see my time lapse as I break out each of the GPIO pins. That can happen in EAGLE now with a single click.
Have you had a chance to check out EAGLE 9 yet? If so, what are your thoughts?