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June 17, 2009
News - Friday Product Post: On t…
about 3 years ago
While technically the MAX30105 is a photon detector (since it detects light), normally "photon detectors" are expensive units used for detecting a single photon. I would consider the MAX30105 to be a photodetector. I watched the demo video and, just for a second, I thought Sparkfun was selling photon detectors for $13. That would be impressive!
News - Enginursday: On the 555 T…
about 3 years ago
Thanks for writing this article. It’s an interesting (and obviously controversial) topic. Over the years I’ve moved into the ‘microcontroller’ camp.
For learning about analog circuits, using the 555 is a great way to experiment. However, my prototypes always seem to grow in complexity and using a microcontroller keeps the options open. In the example above, you could add motor control features like slow-start, non-linear control and even add feedback sensors to make the system more robust.
Analog circuit design is way more fun and using analog parts can reduce costs. But for getting small projects running, I agree with the author: using a microcontroller is usually best.
News - Enginursday: Doing Away w…
about 4 years ago
These last two Enginursdays have been great! These topics are a little more on the advanced side, but they are good introductions on how to handle timing issues. These days I default to using a RTOS whenever I'm dealing with multiple events. My 'simple' programs always seem to grow and it's easier to start with an RTOS then to try to manage multiple threads manually.
News - New Product Friday: Degre…
about 4 years ago
Nice video: I’m always weirdly excited when Friday has a classic new product post.
I noticed that the video said that 6-DOF was accelerometer + magnetometer, but the product page shows it as a accelerometer + gyro. I think it is pretty standard that the 6-DOF vs. 9-DOF is the addition of the magnetometer.
News - According to Pete - Filte…
about 6 years ago
Nice video. Explaining analog filters in 15 minutes does not sound like an easy task! I learned them in school, but I didn't really 'get it' until I worked with some real world examples.
My vote would be to set up a couple real circuits and test equipment and show what you can do with a simple RC or Sallen Key. You seem to have a love for audio, so maybe an example showing how to remove 60 Hz hum or removing digital noise from a sensor output. I would get more value out of seeing those filters in action and understanding your component choices instead of going over the equations to configure a Bessel or Chebyshev roll-off.
DSP would be cool too, but if you can explain DSP in 15 minutes, then you should be nominated for some sort of award!
News - According to Pete - Augus…
about 7 years ago
The mixer circuit you describe (@3:30) looks like an adder (summing) circuit to me. If the input to the opamp is a virtual ground, then a 1V input signal will cause 100uA through each 10K resistor. The output will need to go to -3V to pull 300uA through the feedback resistor to compensate. Is there something that I'm missing?
As always, awesome video. Your projects inspire me to start hacking stuff together every month. I can't wait to see some LEDs on that guitar!
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