Category: blinkm

Did you know you can power BlinkMs or BlinkM MinMs off two 3V coin cells? Here is a tiny 3d-printable coin cell and header socket holder for BlinkMs and BlinkM MinMs. It snaps together and has mounting holes to turn it into a pendant or mounting additional diffusors for the LEDs.

And you don’t need many parts to build it:
– one each of plastic pieces here (see the STL files on Thingiverse)
– two CR2032 3V coin cells
– one 4-pos female header socket (Digikey S7037-ND or equivalent)
– two short pieces of solid wire (old resistor leads, 26 gauge wire stripped, etc.)

Steps:
1. Push the 4-pin socket into the hole until it stops. It should friction-fit in without any need for glue.
2. On the bottom, feed the two wire pieces in as shown in the photos, and solder them to the two pins on the header socket. These wires become the battery terminals.
3. Bend the wire battery terminals so they make good contact with the cells.
4. Insert coin cells, snap together top piece.
5. Insert BlinkM and watch it play its light sequence.
6. To protect the back, put a small piece of gaffers tape or similar over the terminals.

For more info and pix, see this project’s Thingiverse page or the Flickr pictures.

Sometimes you just want a little extra light in a room. With RGB LED tape, you can put light anywhere. But controlling its brightness and making it the color you want is a bit harder. A BlinkM MaxM can easily control LED tape, either as a stand-alone device, with an Arduino, or your computer via a LinkM. Stand-alone mode is great if you want a specific color or color pattern (the BlinkMSequencer makes this really easy) For this installation, I added a FreeM to the MaxM to let you control the light with a standard infrared TV remote control.

Another nice thing about the LED tape is that when it’s off, you can’t see where it’s installed.
Here’s a video showing how it all works.

How to make this

The parts you’ll need are:
– BlinkM MaxM
– FreeM
– RGB LED flexible tape
– 12V DC @ 1A power supply, you probably have this laying around
– Any universal TV remote, like this one

First up is to wire up the RGB LED tape with extension wires to go from the tape to the MaxM. This is so you can hide the MaxM where ever you feel like. Cut the wires to the length you need and solder them to the LED tape and a 4-pin male header like in the photo below. Note because the LED tape switches the Red and Green lines you’ll need to switch them because MaxM’s lines go V+,R,G,B.

With that done, you should be able to hook everything up and have the MaxM drive the LED tape. The LED tape takes +12VDC. The amount of current it needs depends on the length of tape your driving. Chances are you have a 12VDC @ 1000 mA wall wart power supply from an old piece of computer gear. That should work fine.

If you want your accent light to play a constant color or color pattern, you’re now done and can place the LED tape where ever you like, like on top of a window sill. Peel off the sticker backing and stick the LED tape where it should go.

Adding FreeM

If you want to go the step further and add a FreeM to give your light a remote control, then follow the steps on the Using FreeM with BlinkM MaxM page.

But it’s really not much more than plugging the FreeM into the bottom of the MaxM.