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 #62923

Member Since: March 4, 2009

Country: United States

  • You can actually use a ATtiny45 instead of ATtiny84. Cheaper, and saves a crystal (ATtiny45 has 4xPLL to generate 48MHz clock internally): http://tequals0.wordpress.com/2011/09/26/attiny45-based-usbtinyisp-programmer/

  • I was checking the schematic and noticed that the R_prog resistor is set to 1K ohm. Is this correct? According to the MCP73831 datasheet, 1K R_prog corresponds to a charging current of 1 amp. This sounds quite a lot and will probably charge the battery too fast. Any idea?

  • I like last year’s quiz-based prizes a lot. At least it’s a way of learning. Sparkfun can use it to help with their educational mission. Captcha? not so much. It’s really a waste of a lot of people’s time. I tried it for 20 minutes and decided that my time is worth more than the $100…

  • If you want solderability, you may want to check out this method: <a href=“http://rayshobby.net/blog/?p=1128”>http://rayshobby.net/blog/?p=1128</a>.

  • This is a very cool product. But if you are just looking for an easy way to avoid being exposed to high voltage, an alternative is to modify one of those remote controlled switches. They are wireless and come with a remote and one or several power sockets. You can get them in many retail or online stores for cheap. All you need to do is to modify the remote – use a MCU to simulate a button press, (often as simple as sinking one button pin to ground). I’ve tried this before and it works quite well. And it’s even wireless!

    (Update) check this page: <a href=“http://rayshobby.net/blog/?p=936”>http://rayshobby.net/blog/?p=936</a> for example.

No public wish lists :(