2×2 LED matrix


Breadboard layout for the 2×2 matrix with rows and cols labelled
Laid the circuit out on a cardboard simulation of the breadboard, with wires taking the place of the breadboard rows and columns.
It’s unorthodox, but it helped me to do this to see the flow of the current. I tried to do it from the breadboard, but it was a bit easier for me to understand when I could move the wires around a bit.
I also really like the look of the wires and the components in this “soft” circuit. I guess this could be a really funky sewable electronics project if we wanted it to be!

(above) Finally able to decipher what it did, and got Joe the Bro to help explain it.

Note: the 2N2222 transistor is a NPN (not pointing in) BJT (bipolar junction transistor). Collector is negative, base is positive, emitter is negative. Technically, the flow of current is from positive to negative in a diode, but the application of a current to the base AND a current being applied to the collector will enable saturation of the middle layer of the transistor sandwich and permit flow from the collector to the emitter.

Circuit explained.

The two transistors are acting as switches.  A voltage applied to the base  will cause the base layer to become saturated with electrons and cause the current to flow from the collector to the emitter .  This permits a flow of the current through the 2 LEDs connected to each transistor.

Unplugging one of the transistor bases will prevent the related collector-emitter flow, and will turn off those LEDs attached to the transistor.

Disconnecting the wires attached to either of the 220 ohm resistors will break the circuit for the two LEDs connected to that resistor.

Next up: add 4 single input, single output switches on each of the resistors.

Sewing (Softies) with Electronics

We had the first session of Sewing with Electronics.
Covered a lot of possibilities, then decided to make a sock softie with LED eyes.
Today we were trying out the 4 ply conductive thread from SparkFun. So cool!
It feels like a chain, it’s so thicccckkkk!
Two LEDs in parallel are nicely supported by a single 3V battery.

Finished the project, here’s the video!

Sewing with Electronics

This is a fun, easy-in way to get your girls to learn electronics and your boys to learn sewing. Includes use of the Arduino Lilypad Protoboard and various lilypad components. Conductive threads, recycled wires will be used. Two computer workstations will be provided. For dedicated workstation, the student must bring his/her laptop. *** NO TAKE HOME ELECTRONICS ***
Session 1 – Using a needle and thread, conductive thread, copper wire, conductivity. Demonstration of Lily Twinkle and lily tiny projects. Diodes, simple circuits.
Session 2 – Use of the Arduino Lilypad
Participants may purchase components at any time during the class series.

Can I Make Things Move?

Explore problems and techniques encountered when attempting to make things move. A variety of materials will be used. Each of 4 sessions will introduce a 15 minute topic followed by individual constructive play.
Start any day, different projects each day.

Can I Make Things Move? Jurassic Park Mechanism

For these sessions, participants will be provided with mechanisms that were used to open and close the gates on a Jurassic Park advertisement.  (motorized with cam/linkage) They will create a take home project of their own design.

Day 1: Kids will talk a bit about battery types and formats and change the form factor for the battery supply.

Day 2: Hack a power supply to power the mechanism.

Day 3: try to figure out how the mechanism worked.

Day 4: They will then visualize an action that they can use this linkage to perform.

Can I Make Things Move? Olde Fashioned Machines

For these sessions, participants will be building scenes that use motors, pulleys, gears in their very own action scene.  They will create a take home project of their own design.

Day 1: Videos for inspiration, parts list, simple machines, brainstorming.

Day 2: Independent project working time.

Day 3: Independent project working time.

Day 4: Project working time and group show.

Can I Make Things Move? LEGO machines

For these sessions, participants will be using LEGO in various problems presented to he group.  They will create a take home project of their own design ***on the last day only.***

Day 1: Wheelies

Day 2: What’s in the box.

Day 3: Stage Movements

Day 4: Building up.  Free play with parts.

Experiments in Conductivity

2nd through 5th grades.

Use a Multi Meter while exploring experiments in conductivity.Participants will learn the continuity test feature of the multi meter, and build their own personalized continuity test board (including tricks as they see fit). Conductivity of various new and unusual materials, as well as familiar foods and materials.