Transistor vs Capacitor

A capacitor stores electrical energy in an electric field, acting like a temporary, fast-charging battery that blocks DC and passes AC.

A transistor is a semiconductor device that controls current flow, acting as an amplifier (to boost signals) or a switch (to turn signals on and off).

Lab

Using transistor to control higher current power source:
There seems to be no significant difference to the motor rotary speed when the potentiometer is turned. I haven't found the root cause yet.

I haven't finished the second lab as we ran into a suspected problem of fried Arduino. A lot of symptoms from different people (Shloka, Ryan, James). A lot of trials and errors. We felt like a PComp doctor in an ER.

Some trials and more errors:
- a board didn't light up when connected to the laptop
- then we tried another port, it still didn't work
- tests the analog pin with potentiometer, it reads signal well
- tried simple debugging by executing blinking code on LED, the digital pin doesn't seem to work on some boards but mine works (thankfully)
- tried different breadboard, an Arduino came back alive on my breadboard, but the other still not.

Possible cause:

- Some wiring issues cause short circuit while using the motor with the motor drive that we have soldered, possibly firing some parts of the Arduino (or not?)

More midterm development
Ouija board

"Documentation goes wrong"
LED placed on table, with a phone on a tripod that is bended perpendicularly. The viewing point is meant to be from top to bottom to mimic the usage of 'board' and also a reference to the procedure of documenting table-top works.

Materials: LEDs,

https://www.tate.org.uk/tate-etc/issue-6-spring-2006/ouija-board-quest-contact-spirit-josef-albers

ideomotor phenomenon: a psychological phenomenon wherein a subject makes motions unconsciously