16 September 2015

 DIODE

 This Ultrasonic Ranger was capable of using high frequency sounds to report the proximity of an object. When an object was within 5 inches of the Ranger, the code would print out the approximate distance of the object in inches. 

 Here's a circuit with two resistors. The voltage is still about 5v.

 But if you place the alligator clips in a way that lets you measure the total resistance, you see that there is about a 50% drop in voltage.

 Here we set up a speaker system that would play a tone on equal intervals. The potentiometer allowed us to pitch-shift the tone by changing the analog input value.

The same speaker system with a photoresistor added in allowed us to change the pitch by shifting the light as well as turning the knob on the potentiometer.

When measuring just the 10k resistor, the multimeter showed 9.8 Ohms of resistance.

When in a circuit, the resistor cuts the voltage in half, resulting in about 5v of power.

 The photoresistor only let 2k through when in full light.

When covered, however, the photoresistor let almost the full 20k through.

Baby's First Circuits