Larson Scanner modding

larson3

Anton wrote in to ask:

I want to purchase your Larson Scanner kit but need to be able to run it from household current … is there a converter that you would recommend?

Since the Larson Scanner normally runs from 3 V DC, a regulated 3 V power supply can be hooked up in place of the 2xAA battery box. However, 5 V power supplies (like this one) are much more common, and the circuit can be run from 5 V with only minor changes. if you replace the nine 16 ohm resistors in the Larson Scanner kit with 120 – 150 ohm resistors, you can power it from 5 V directly.

Another related question we occasionally get is how to run the Larson Scanner with green LEDs. (Note: by green, we mean “pure” green LEDs which have a forward voltage of about 3 V. Older style yellow-green LEDs with a forward voltage of ~2 V can be used as drop-in replacements for the red ones.) 

If running off of battery will work for you, this is an even simpler change: merely replace the 3 V battery holder with a 4.5 V one, such as a 3xAA. It is a happy coincidence that the circuit can run with red LEDs at 3 V or green LEDs at 4.5 V using the same 16 ohm resistor value. So how about running a green Larson Scanner from a 5 V power supply? Replace the nine 16 ohm resistors with 39 ohm resistors and you should be good to go.

You can find the documentation for the Larson Scanner and more stories about modding it on our wiki. We’d love to hear about any mods you do to the Larson Scanner in the comments or see pictures in the flickr pool.

Access Point Garage Door Opener

Over at Dead, too much lettuce., Scott built an Access Point garage door opener with a Raspberry Pi, an Arduino, and our Simple Relay Shield.

I bike to work. Bikes live in the garage. But with only 2 remotes, I could not keep one in my bag all the time to be able to get to the bike. So a new option had to be created. Most people would have bought a new remote…

LED Kitchen Timer

Dave wrote in to tell us about the kitchen timer he made:

I just wanted to say thank you for putting together such a great site and set of products. I’m a newbie and after about 4 months o studying your articles and using the Diavolino as my development board, was able to make a cool little kitchen timer for my parents this Christmas. I definitely could not have done it without your articles and products.

He documented the project with a series of videos (youtube playlist) showing his progression through building it. Shown above is the breadboarded prototype next to the finished timer.

Thanks for sharing your project photos and videos, Dave!

Breadboard Menorah Kit Instructions

aberson asked about our new Deluxe Electronic Breadboard Menorah kits:

Would it be possible to post the assembly instructions for the solderless kit? (if there are any) I’m wondering if this kit would be suitable for somebody who has no electronics experience at all. Does it call out the row/col number for every resistor, jumper, etc?

Printed instructions do come with the kit, are very helpful, because there’s an actual size component bending guide on the page. We have also posted a pdf version on our documentation site. No prior knowledge of electronics is needed, and we call out the location for each component and provide clear diagrams to follow.

Two New Menorah Kits

Breadboard LED Menorah Kit

Hanukkah comes remarkably early this year, starting on Thanksgiving day, November 28.

Today, just in the nick of time, we are releasing two new LED menorah kits for 2013 that complement our consistently popular Deluxe LED Menorah Soldering Kit.

Breadboard LED Menorah Kit - Parts

The first kit, the Deluxe Electronic Breadboard Menorah Kit, is a response to two requests that we frequently receive: (1) for an LED menorah kit that doesn’t require soldering and (2) for a menorah kit with assorted multicolor LEDs— for that assorted-color candle look. (Nailed it!)

The kit includes a 6″ transparent breadboard, 10 mm LEDs in red, orange, yellow, green, blue and warm white, a control button, battery holder, and a pre-programmed microcontroller.

Breadboard LED Menorah Kit
Breadboard LED Menorah Kit

While the electronic components— the microcontroller, resistors, control switch, and LEDs —are essentially the same as in the Deluxe LED Menorah Kit, we’ve had to make quite a few changes to the layout and firmware to redesign the circuit to lay out so neatly on a breadboard. Additionally, as the perceived brightness of different LED colors can vary quite a bit, we’ve included a specific set of per-color resistors to even out the overall brightness levels.

The Deluxe Electronic Breadboard Menorah Kit is in stock now, and ready to make happy campers on some night(s) of Hanukkah this year.

Special Edition LED Menorah Kit

For the second new kit, the multicolor Special Edition Deluxe LED Menorah Kit, we’ve brought the assorted multicolor LEDs back to our original Deluxe LED Menorah Soldering Kit. Because, why should breadboarders have all the fun?

Special Edition LED Menorah Kit

And it even looks good with the lights off! The new Special Edition LED Menorah Kit is in stock and shipping now.