Monday, November 30, 2015

Cyber Monday 2015

Updated with lots more sales going on!

Bot Thoughts

20% off - 80CFB16
10% off - 6B54471


  • Hackabot Nano, Arduino Robotic Kit, $30 off (coupon code : 8882BB8)


  • 10% off all products with F3E57A2 from Black Friday to Cyber Monday




Happy Thanksgiving from Pololu! Our Black Friday/Cyber Monday sale is almost here! We will be offering huge discounts on hundreds of products and automatically upgrading you to the next best price break for everything else. We will also have some great limited-quantity doorbusters. The special offers become active Wednesday morning (November 25) at midnight PST (3:00 AM EST/08:00 UTC), and the sale runs through Cyber Monday (November 30), ending at 11:59 PM PST. More information is coming soon, including a full list of the doorbusters and sale items, but for now, here is a sampling of the discounts.


Cyber Monday and all its glory is nearly upon us! For this year's celebration of festively-timed discounts, we're putting a huge selection of some of this year's best-selling and most popular products on sale for one day only – from 10-40% off! Check out our Cyber Monday page to get the scoop on the day's special deals!

GHI Electronics

Let's get right to our Black Friday through Cyber Monday Sale.
  • $1 Holey board
  • $3 Holey Moley board (limited edition, only available during this sale)
  • $8.88 mBuino mbed
  • 50% OFF
    • Cerberus boards (Cerb40, Cerbuino, Cerberus)
    • G120HDR
    • G30HDR
    • FEZ Spider Mainboard
  • 20% OFF
    • FEZ Reaper Tinker Kit
    • all NETMF Development Systems
    • all Raspberry PI HATs
    • BrainPad .NET
The sale is available for 4 days but the stock may not, so place your order now!

Electronics Goldmine

$5 flat rate shipping, lots of things on sale--too many to list.

Check them out here:

Ham Radio Outlet

Lots of rigs on sale, check them here:

A Main Hobbies

Electronic kits 10% off, 15% off all else.


Today Only: Particle Sale

30% Off Your Favorite Particle Products

Ah Cyber Monday—the nerdy younger sibling of Black Friday. It’s one of our favorite shopping holidays here at Particle, and we couldn’t help but to get in on the fun. For today only we're offering 30% off some of our favorite Particle products like the Internet Button and Photon Kit. The ideal gifts to get for the engineer in your life, your favorite colleague, or, let's be honest...yourself.

Monday, September 21, 2015

Fixing Flaky LCD Monitor with ESR Meter

My Dell E2210H LCD monitor was really wonky.

Powering up from sleep, it would only occasionally come back to life, usually after resetting itself several times.

More often, it would power off or go into power saving mode, leaving the front panel buttons inoperative.

Occasionally it would reset or power off while operating normally.

Here's how I fixed it, using my DIY ESR test harness to find a bad capacitor without desoldering.

Thursday, August 6, 2015

Automated OLED Test Jig: eeZee MicroSD

How does one test boards one sells on Tindie?

With a fancy-pants, standalone, OLED-equipped, high-zoot test jig, of course.

At least, that's what I built for testing my eeZee MicroSD boards. They're microSD breakouts for breadboard Arduinos. They've got the microSD socket plus 3.3V regulator, level-shifter IC, and various passives.

The test jig features an Arduino on the top of a two-layer permanent breadboard apparatus. Power is supplied by convenient USB connector. I manually place the board onto good ol' pogo pins soldered into the D10-D13 positions (plus power and ground).

A red and a green LED indicates overall status, while the Digole Serial OLED displays pass/fail status for each of the tests: initializing the card, creating a file, and removing a file, with an overall board status.

The test takes just a few hundred milliseconds to complete. The test jig is ready to go at any time. Just plug in a USB cable for power I can run through dozens of boards in a few minutes.

Here's the source code for the test jig: TestJig.ino