Day 4 -Transistor Switching and Build a Logic Porbe

The first 20 min are trying to finish the squarebot

Doesn't have battery on

After finish, we just put the kit and the bot aside and move onto the next part, transistors

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Transistor Switching

We had introduced new surplus call transistor

A transistor can switch a flow of electricity


After learning the function of transistor, we were told to build a circuit  as shown below

And the final look is

And we did some change on the circuit
we took out one of the resistor and the pushbottom and put two wires in
now we use our fingertip to work as the push bottom

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Now we were told to build a logi probe
A logic probe can determine the logic states at a particular point in an elctronic circuit
We can buy one like this for $20

But we also can build one by ourself for a very resonable price

first, we need to build the circuit on the breadboard first
and here are the schematic

This one is not a very difficult circuit to build since we had some practice on the transistor before

After familiar the circuit, we moved to the fabrication room to do the soldering

It took me a while to figure out the picture which show how the connection goes
But, I did figure out and finish the logic probe!!

Unfortunately, my positive wire(the red one) is too short, so I need to go back to get a longer one and solder it

Since we were in the fabrication room, we also made a part for the next project
A DB9 connector