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June 22, 2015
Tutorial - SparkFun Inventor's Kit for micro:bit Experiment Guide
about a month ago
I was working through the experiments in preparation for working with my niece this summer when she visits. I found a slight issue with experiment 8: Using a Servo Motor.
The experiment shows connecting the servo power connections to the power rails of the Micro:bit. These are 3.3V. But the servo is more likely to want something closer to 5V. In my case, the servo behaved erratically. I tried another servo and that one did not work at all. I could tell it was getting the correct signal and power was connected. It just wasn’t happy.
I first connected a capacitor in parallel with the supply pins of the servo. That helped a lot. But it still wasn’t quite right. I then grabbed a breadboard power supply and connected the power pins on the servo to the 5V output. I then connected the ground of the supply to the ground of the Micro:bit. This worked perfectly: with both servos. The 3.3V signal from the Micro:bit was high enough to work. The servo just needed a bit more voltage for its supply.
News - Setting up a Headless Ras…
about 2 months ago
You mention you will cover three ways to configure the PI. But I don’t see a link or anything to the tutorial. Am I missing something?
News - Shades of Gray in the 3D …
about 3 months ago
I would be careful about advertising that maker map. I did not check all the sites. But the ones around the Austin, TX area are seriously out of date. Five out of the eight shown have no active web site associated with the web address provided by the tool (I get a 404 error when I click on it). One of these is the Techshop in Round Rock. I think just about everyone knows all of the TechShop’s went bankrupt a few months ago. Another is a listing for SXSW Create. This doesn’t exist anymore and the listing states it is SXSW 2013! The remaining ones don’t really look like makerspaces. They look more like retail stores that provide materials for makers.
It is interesting that one makerspace that is still active in the Austin area is NOT on that map: http://atxhs.org/wiki/Welcome_to_the_ATX_Hackerspace_Wiki
Perhaps it is too new to be on that map?
News - DIY Holiday Projects, Par…
about 7 months ago
How about adding some type of capacitive touch switch to either the candles or the flames? Then you could “light” the candles just by touching them. I would bet your niece would get a kick out of that.
News - Adventures in Science: Co…
about 9 months ago
I am curious about the large doll in the background. What is THAT?!
News - Enginursday: Exploring Di…
about 10 months ago
Have you considered products from other vendors? For example the CP2104 from Silicon Labs? It has proven to be a very low cost alternative to the FTDI offerings.
News - Enginursday: Playin' with…
about 2 years ago
No worries. The website says accounts won’t be disabled until November 31st. Since that day will never arrive…
News - Enginursday: Battle of th…
about 2 years ago
Yes, the Chronodot uses this device (that is how I knew about it). Adafruit does sell the Chronodot (I have bought a couple of them). They have also created their own breakout board for this device as well as a feather board.
If you are in need of the higher accuracy of the DS3234 but pin limited such that you want the I2C bus, you could use the DS3231 also from Maxim. It appears to be essentially the same chip but with an I2C interface instead of SPI. The register set even appears to be the same.
Edit: Just noticed the two parts have a different number of pins and a different pinout. So the DS3231 would require its own breakout board.
News - Friday Product Post: Dili…
about 2 years ago
Thank you very much for the response. I guess I need to buy the new version. I already have the old version with all the accesories. Do you know if the old accesories will still work?
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