Day 3 - Switches and Relays and squarebotInstructions

We started with introducing switches

Basically, switches has three pins
When you use the switch, it connects the center terminal with one of the outer terminals.

When the switch is pressed, the light goes off

There are many different kinds of switches 

some require wires and some can just put into the breadboard

For the push bottom switches, there are two kinds

Off-(ON): Only have connection when you press it

ON-(OFF): Disconnect when you press it

And we always can use a multimeter to check the swtich by doing the connectivety test

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Relays

Next, we learned about what is a relay

A relay has lots of coil of wire wrapped around an iron core, when there is electricity runs throught, it will generate a magnetic force which pushes or pull a springy strip of metal around two contacts.

Inside of a relay

A is the coil
B is the lever which being pushed
C is the to pushes outward to the poles of relay,D

After learning about relays, we needed to build a relay driven LED

Schematic

The result I got

It took me a long time to figure how this thing works and actually building it

But it worth to see the light was switching in between XD

After this one, we were told to add a Capacitance so the light can switch even faster!!

Schematic and example

The result is

It didn't took me as long as last one, but still used about 10 to 15 min to figure out how to let it work

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After the relays (took me 3/4 of the class time to do it)
we were given to build the squarebot

with the introuction manual, it was going fine, but still didn't have enough time to finish it

I'll say its about 70% done, and hope it can run  LOL