![]() ![]() Open Up the Arduino IDE software on your computer. Having a hard time seeing the circuit? Click on the Fritzing diagram to see a bigger image. Ready to start hooking everything up? Check out the Fritzing diagram and hookup table below to see how everything is connected. In this circuit, you’ll learn how to use a potentiometer to control the brightness of an LED. The voltage is divided proportionate to the resistance between the middle pin and the ground pin. A potentiometer is a perfect demonstration of a variable voltage divider circuit. When powered with 5V, the middle pin outputs a voltage between 0V and 5V, depending on the position of the knob on the potentiometer. In this circuit you’ll work with a potentiometer.Ī potentiometer is also known as a variable resistor. This happens sometimes, the most likely cause is a confused serial port, you can change this in Tools > Serial Port > Still No Success?Ī broken circuit is no fun, send us an e-mail and we will get back to you as soon as we can: Experiment 2: Reading a Potentiometer Introduction Try taking it out of your breadboard, turning it 180 degrees, and reinserting it. ![]() If it isn't, make sure you have assembled the circuit correctly and verified and uploaded the code to your board, or see the troubleshooting section. You should see your LED blink on and off. When you're using a pin as an OUTPUT, you can command it to be HIGH (output 5 volts), or LOW (output 0 volts). We use a built-in "function" called pinMode() to do this. * Modify the code above to resemble a heartbeat.īefore you can use one of the Arduino's pins, you need to tell the RedBoard or Arduino Uno R3 whether it is an INPUT or OUTPUT. Find the smallest delay that you can still see a blink. different numbers and see how it affects the timing. Try changing the 1000 in the above delay() functions to This code is completely free for any use.ĭigitalWrite(13, HIGH) // Turn on the LEDĭigitalWrite(13, LOW) // Turn off the LED With lots of help from the Arduino community. This sketch was written by SparkFun Electronics, Turn an LED on for one second, off for one second, Hit upload, and see what happens! language:cpp **Ĭlick the picture above for a larger, easier-to-view imageĪlternatively, you can copy and paste the following code into the Arduino IDE. The negative side of the LED is the short leg, marked with a flat edge. **Please note: Pay close attention to the LED. Polarized components can only be connected to a circuit in one direction. Pay special attention to the component’s markings indicating how to place it on the breadboard. Ready to start hooking everything up? Check out the Fritzing diagram and hookup table below, to see how everything is connected.
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