Test driving with the square bot was successful, and the robot survive the crash testing with no damage to its structure.
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A transistor is a switch which control the flow of electric current just like a relay. Yet, it is more sensitive and versatile than a relay. Transistors use "positive" or "negative" voltages to control the switch on or off. There are two type of transister, NPN and PNP. NPN uses a positive potiential to activate the switch, and PNP uses a negative potential.
A schematic with a NPN transistor controlling the brightness of the LED. Always connect a resistor to the transistor because the transistor takes only a small current.
When the button is pushed allowing a positive potential to reach the base (middle pin) of the transistor, the light lit up as more current is allowed through the emitter to the LED.
Using the finger tip to activate the transistor. Since the resistance of human skin was so great that the transistor did not fully activated thus allowing only a small current enough for the LED to grow with a dim light.
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A microcontroller is a circuit board installed with all the hardware and firmwares ready for uploading programs from computer to control different electronic output devices. The pins on the side of the microcontroller are for revicing inputs and delivering output through small current.
Using the microcontroller to control the blinking sequence of the LED.
K.I.T.T car's pattern from the Knight Rider TV series using a microncontroller and 4 LEDs.
Controlling a LED to make it blinks faster and faster after.
Using a button
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