Control with a button
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We will now figure out how to control the LED using a button.
Materials: LED, 220 Ohm resistor, wires, 10 kOhm (10,000 ohm) resistor, and board. Wire up the board like the picture. (Make sure to use the 220 Ohm resistor with the LED and the 10 kOhm with the button) |
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We need to add parts to the code to make this work. Before we had just the loop, now we add if and else. Every green part of your code needs an open and closing { } to run. The curly brackets are like sandwiches for your statements. Make sure each has them.
Write a code similar to below and upload it to your board to see if it works.
Write a code similar to below and upload it to your board to see if it works.
Learn How to Code! The Basics
We will start by just learning how to send code to the Arduino to make sure it works. You will also learn to name and save your files to a flash drive.
Open the Arduino software and plug in the Arduino board to your computer's USB. Type in the code below (without the // and after). \
Things after a // are not read by the computer, they are just comments so to tell people what the line of code does.
Follow instructor directions.
Things after a // are not read by the computer, they are just comments so to tell people what the line of code does.
Follow instructor directions.
When you are finished, click the check mark in the upper left. Upload your code to the Arduino by clicking the right arrow.
If you ever get an upload "Problem uploading to board" error, click Tools, then Port, and then select Arduino (shown below).
Once you see the onboard light blinking, you did it!
If you have time left over, play with the wait variable and upload it to see how it affects the light.
After you are done coding the onboard LED, save the file and open a new Arduino IDE code.
If you have time left over, play with the wait variable and upload it to see how it affects the light.
After you are done coding the onboard LED, save the file and open a new Arduino IDE code.
Lighting an LED
You just made your first Arduino program. Congratulations!!
Now we are going to figure out how to light LEDs from the Arduino board so that you can use lights on your robot later.
You will need: wires, a 220 ohm resistor, an LED.
Set up the board like below and see if you can figure out how to get one light on. (MAKE SURE YOU USE THE RESISTOR OR THE LIGHT MAY BREAK)
Once you get one light to work, figure out how to light more LEDs using your board.
Now we are going to figure out how to light LEDs from the Arduino board so that you can use lights on your robot later.
You will need: wires, a 220 ohm resistor, an LED.
Set up the board like below and see if you can figure out how to get one light on. (MAKE SURE YOU USE THE RESISTOR OR THE LIGHT MAY BREAK)
Once you get one light to work, figure out how to light more LEDs using your board.
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LEDs only let current flow through one way. The LED will only work if you plug the longer end to positive pins on the board and plug the shorter end up to ground or negative ports on the bards.
If your light does not turn on, try to flip your LED. It may just be in backwards. |
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Now that you have one light working, see if you can get more lights on.
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Series and Parallel
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If you want wiring to stay together, the breadboard is very useful.
Breadboards help you wire electronics together. The side bar holes are all connected and each of the rows left and right side are connected, as shown in the picture below. |
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Connect up your lights to the breadboard like below. See what changes between each type. Can you figure out how to power all three setups off the same board? Once you get your lights to work in parallel, try to use different colors. What happens when you try to use all different colored lights?
Single LED
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Series LEDs
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Parallel LEDs
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