![]() This is the basic property of a light sensor. In that case, it should be easy to make a useful tool that makes an LED light up when it gets dark. You should see the brightness of the LED change. When the LED starts blinking, put your hand over the light sensor and take it away. With this setup, let’s now use Arduino to run the program we wrote at the beginning to make the LED blink. So, I’ve added a resistor to prevent the current from flowing into the LED. When it’s bright, the resistance value goes down. To do that, let’s set up a circuit to control the brightness of the LED. When a project involves a light sensor, it’s natural to think about a project that will create an action when it gets bright in the morning or dark at night.įirst, let’s test the sensor to make sure that a change of brightness will lead in a change of the resistance value. Humans have five senses (or maybe six in some cases…), but regarding electronic parts, there is a variety of types of sensors available.Ī light sensor (also known as a “CdS cell”) has a large resistance value when placed in a dark location and a low resistance value when places in a light location. Instead of the 5 senses that human have, Arduino and computers are using sensors to determine their surroundings conditions. To put it simply, a sensor is used in place of the five senses (touch, sight, smell, taste, and sound). Particularly in the field of electronics, you can often hear the term “_ sensor”.Ī sensor is an electronic component that is used as an input device. You’ve probably heard this word before, but do you know exactly what a sensor does? This time, we will control the strength and the timing based on the input of a sensor. We controlled the LED by changing the pin number, the strength, and the timing to make it light up. This was an “output” from Arduino to the LED. We already learned how to use electrical signals to light up a LED. Now, we’ll explore more possibilities by adding other electronic components. Serial.println(sensorReading) constants sensorMin and sensorMax.In a previous article, I introduced the basics of using LED circuits with Arduino. Print the reading from the photoresistor to the serial monitor. * I added the following line to the example code to calibrate the photocell in the following section*/ read the photocell and store it in the variable sensor maximum, discovered through experiment sensor minimum, discovered through experiment ![]() If the break is not placed in the code, it will continue to run through the next case, so it is very important to include the break. Once the code has ran, it will hit the break command and begin to loop through the program again. When the program gets to the switch case, it will compare the variable “range” to the 4 cases and choose which code to follow. In the example below, we have mapped “range” into numbers 0-3. It will then select the matching case, and run the code listed under it before returning to the top and looping through the code again. When using a switch case, the program will take a variable, in the example below it is “range”, and compare it to several cases. ![]() A switch case statement is used in place of multiple if statements. ![]() ![]() In this example the user will learn to use a switch case statement. ![]()
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