SparkFun will be closed Nov 26th and 27th for the Thanksgiving holiday. Orders placed after 2:00pm MT on the 25th will ship out Monday the 30th.


Member Since: December 18, 2011

Country: United States

  • This board looks like it is over-engineered to me. Using a $5 accelerometer when a 3¢ vibration switch would do seems a little strange (unless you are a company that makes accelerometers).

    I tried designing an analog circuit that would handle more output power and work over a wider output range on a smaller standby power budget: https://gasstationwithoutpumps.wordpress.com/2015/03/28/ideas-about-vibration-detection/

    I’ve not tried building it, though (too many SMD parts). If anyone tries it, please leave a comment on my blog!

  • If you want really light weight, and don’t mind disposable batteries, you get about the same energy from a #10 zinc-air battery that weighs 0.3g (100mAH at 1.4v).

  • This summary does not explain derating ceramic capacitors, which lose their capacitance with a high DC bias.

    See http://gasstationwithoutpumps.wordpress.com/2013/06/26/capacitance-depends-on-dc-bias-in-ceramic-capacitors/ and http://gasstationwithoutpumps.wordpress.com/2013/06/26/kemet-tech-reports-on-capacitors/

No public wish lists :(