Oct 17

Night Owl security camera IR Cut filter issues

recently has an issue with a Night Owl security camera with a ‘sticky’ mechanical IR Cut filter. Got it replaced by Night Owl, but the replacement has the same issue… So decided to take a look and see if I can fix it myself. First, how do you know you’ve got an sticky mechanical IR …

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Oct 09

Circuit Cellar article – “The Footlight Project”

Got a new article published in Circuit Cellar (Oct-2015 issue). http://circuitcellar.com/inside-this-issue/ This article is about a failed attempt at building “foot headlights”. Everyone always writes these glowing articles about successful projects. I wanted to write one about a failed project so that readers know that projects do fail, and that’s OK too because every failure …

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Aug 09

DIY clip on sunglasses

here's the sunglasses by themselves.  note magnets on the temples.  corresponding magnets positioned inside the glasses frames.

Recently went to try to get a pair of those magnetic clip on sunglasses for my glasses. Optical store said sure, that’ll be $160, plus you have to leave the glasses for 1-2 weeks so we can send them off! So non-starter right there. What to do? Why not make your own! The way the …

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Jul 28

Cat Faucet parts

Cat Faucets are back in stock! For those folks waiting for the out of stock cat faucet assembled units. I’ve got most of the parts orders out now. should be seeing those parts coming in within a week or two. Once that happens, I’ll assemble a few units and we should be ready to mark …

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Jun 26

RN52 bluetooth adapter microphone


So lots of folks struggling getting a microphone to work with the RN-52 Bluetooth adapter. Here’s what I’ve got working. This circuit: I cribbed off the circuit for the eval board. I’ve run R1 at both 1K and 2.2K, both work ok. C1/C2 are 47nF and C3 is 1uF. C3 is ok for electrolytic, but …

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Jun 10

Roving Networks RN-52 flashing LEDs

was recently working on an RN-52 board from Roving Networks. Stumbled across something thought other folks might find useful. The docs say LED1/LED2 flashing indicates “module is discoverable”, what the documentation doesn’t say is that is LED1/LED2 alternately flashing. If they’re flashing together, then you’re in DFU mode! I only found this because I’d accidentally …

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Apr 29

Shoehorn a accelerometer heading calculation into an ATTiny 261

working on a recent project, I wanted to get an ATTiny261 to calculate a heading in degrees from an accelerometer. The accelerometer (an Xtrinsic MMA8453Q 3-Axis, 10-bit/8-bit Digital Accelerometer) has an I2C interface with digital X/Y/Z readings, so no analog to digital mess, just simple math, right? RIGHT…. Given all the UAV stuff out there, …

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Sep 18

WP e-Commerce, what a mess

boy, thought I’d move forward by using WP e-Commerce to build my shopping cart interface. Man, the shipping is a mess. first the recent USPS update broke the USPS shipping calculation. I got that fixed myself (no help from the WP e-Commerce guys). Now something wacky with the interaction between PayPal and the Shipping address. …

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Jul 07

New Web Site!

took some time, but migrated from a relatively heavily customized WordPress site to an almost out of the box WordPress site. Did that so I could get a shopping cart plug-in that would actually calculate shipping based on destination rather than being stuck with one shipping charge that had to apply across the board. Let’s …

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Feb 21

Samsung Infuse battery life

Got a Samsung Infuse when they first came out. So yeah, mine is now ‘old’. All of a sudden about a month ago, battery life went into the dumper. Charge to 100% before going to bed, then in the morning less than 50% remaining. Also noted that the Samsung Infuse case seemed warmer than expected. …

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