Jan 29 Week 3 Lab: Electronic Objects

Lab covers how to use analog outputs to the Arduino Uno R3

Serial Output

Asynchronus Serial Communication

Open Serial Monitor -> electirc plug, Ctrl+Shift+P

Voltage Divider

Make sure dividers and wire are in same verticle row

GND to (+)

5A to (-)

Showing Volts Instead

Work out where float line needs to be in code.

Change “Serial.println()” fuction to print voltage rather than the reading variable.

Then, once that works, these three lines replace the current “println” :

Serial.print(reading);

Serial.print(“,”);

Serial.println(voltage);

• Note: Serial.print() used in first two lines differ than Serial.println() on last line, see how these functions differ

Issue: Could not figure out where float code belogned without defining error popping up no matter where i tried, but retried in morning and worked

Potentiometer

Like a resistor whose value changes when you turn the knob

Value(Ohms): 10k

Middle leg is called “wiper”, serves as VOut (output voltage of divider)

Turning the knob causes resistence on one side of wiper to go up and the other to go down.

• VOut will move closer to 5V or 0V depending on which way knob is turned

Controlling the Brightness of an LED

Light Sensor

Breadboard

Average (Untampered)- ~70

Low (Shadow)- ~22

High (Flashlight)- ~139

Thermistor Side Note

Works similar to light sensor, with resistence changing with temperature instead of light.