Weekly Roundup – Top Links for the 3nd Week of October 2017

From the Editor

First, to all that are celebrating Diwali this week, we hope that you have a fantastic week.  As part of this, our author TK Hareendran has put together a post that may help your celebrations.  His remote firework fuse is a project that can help add a bit of safety to any fireworks display.  It uses a radio transmitter/receiver pair to set off fireworks, firecrackers, or even model rockets.



Next week, Kelcie, will put out the second part to her micro:bit Halloween series.  As part of the AspenCore websites, there will be a roundup of all the Halloween projects which will be posted on EEWeb.



Now onto the Weekly Roundup…


snaptronic Offers Low Profile Metal Dome Battery Contacts

I recently came across a post on Twitter from snaptronics showing the use of small metal, dome snap switch covers used as a compression spring for battery contacts.  This is a simple use case, but has the potential to shrink current applications that are using standard wire spring contacts.  I love the approach.  Let us know if you try this.  Send us pictures.



Dome Snap Switch

Battery holder concept with a dome snap switch as a compression spring


PICKit 3 Mini

A blogger going by the user name of Reviahh has detailed their PICkit 3 mini project.  This project was not an attempt to specifically create a micro standalone device, but as a practice run to be able to create projects with embedded debugging capabilities built on board.  Unfortunately, shortly after the post went live, the blog site seems to have gone down, but the cached version is still out there (the link takes you to the cached version).


PICKit3 Mini test board

ST Microelectronics Releases the STSPIN32F0(A) SiP BLDC Driver + MCU for Battery Powered Devices

ST Microelectronics has released a new variant of their STSPIN32F0 SiP (System-in-Package) devices for use with two cell lithium battery powered devices.  The previous version of the device had a low voltage cutoff at 8V, but the new variant supports down to 6.7V (actually slightly lower when you look at the datasheet).  The part comes in a 7mm x 7mm QFN48 package.  Included in the device is a programmable Cortex M0 microcontroller with 4kB SRAM and 32kB flash three half-bridge, N-channel gate drivers.  The gate drivers can provide up to 600mA of drive current.


The STSPIN32F0 SiP for use with brushless motor controller designs


Steve Hageman on why Friends Don’t Let Friends Use Un-Shielded Inductors

Have you ever wondered if it is worth it to use a shielded inductor or not in your design?  After all, many cheap power supplies are manufactured with large, unshielded inductors.  Steve takes you through a pretty convincing argument on why you should look to use shielded inductors.  This post is complete with oscilloscope measurements.


An example of a power supply with an unshielded inductor

Henrik Forstén Demonstrates the Third Version of his Homemade 6GHz FMCW Radar

Radar is something that really fascinates me.  What used to be accessible to very few is now becoming commonplace.  Henrik shows off the latest version of his frequency modulated, continuous wave radar.  It can detect a human sized object beyond 100m and show multiple moving targets.  It is a really fascinating read.  All the boards were manufactured by OSHPark.


Henrik Forsten 6GHz Radar


Using a SI Labs EMF8 for Thermocouple Data Logging

I came across this older post from Robert Keim this week and found it rather useful.  Both in my professional world and in my hobby projects, I have a need for temperature monitoring.  This project uses a few low-cost hardware modules and couples them with Scilab for data logging and analysis.  I really love to see embedded projects that interface with the desktop environment.  Using Scilab for the bridge, and having full GUI control make this project unique.


SI Labs EMF8 development board used with Scilab to monitor a thermocouple


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  • kiranshashi

    I am liking this weekly roundup – format.
    Good. Short and simple and one can jump into stuff that they are interested in .

    • kiranshashi

      Adam, Thanks for replying.
      Yes I would like to see small DIY type of projects like ATTiny45/85, Arduino based, Motion sensor, Voice controlled home automation.
      Building amplifiers for earphones.. things like that.
      I also like the quality of materials presented out here.
      Good Luck and Best Wishes on the upcoming holidays.

    • Adam Carlson

      I am glad that you are enjoying it. Are there any topics that you would like to see more of?