I’ve been meaning to test out several new products I bought. Figure I would take the camera along for the ride.
Items in the video:
Tag: testing
Apple Makes Their Own Sweat
Combining 74HC74 & 555 Integrated Circuits
After working with some basic 74HC74 and 555 circuits, it was time to get fancy. I replaced one of the button triggers from my 74HC74 circuit with a 555 timer delay. Then I replaced the other button with a 555 timer delay as well. What do you think happens if I swap out the 22 μF capacitors for 4.7 μF? Remember […]
Using a 555 Integrated Circuit
I posted about the 74HC74 flip-flop on Saturday. For the same project I’m going to use that IC for, I’ll probably use a 555 timer. It’s often referred to as one of the most useful ICs you can get. I’ve never used the 555 either, so I wired up some simple demos using it. In order to show two […]
Using a 74HC74 Integrated Circuit
I received some advice to use a 74HC74 flip-flop for a project idea I’ve had. I’ve never used an integrated circuit so I thought a good first step was to put together a very simple demo I could hack around with it. This IC is big enough it actually provides two flip-flops, one on each side as […]
Pi AD2 Accuracy
While developing Pi AD2, 90+% of the testing was done on my Mac. Over Thanksgiving I did use the actual Pi for a 10 minute workout on Dad’s Airdyne, but the UI, code, and formulas are all completely different now. It was unclear how well everything would work on the Pi’s hardware. After a longer 20 minute workout yesterday, I couldn’t ask for better accuracy.
When I finished the workout, the Airdyne showed 458 calories and 6.68 miles, while Pi AD2 showed 455 calories and 6.68 miles. That’s an accuracy of 99.3% for calories and 100% for distance! See for yourself…if you can even see the display. 
I did uncover some usability issues and determined I need to prioritize getting the production build to work. Having to wait for the development build to run can take a minute or more. I should also make the app launch on boot since I don’t use this Pi for anything else.
Nick Momrik 