Actually operate the LED step by step to see how the brightness shifts. The brightness can be adjusted by making the LED blink. Let’s change the LED brightness using only the digital output. ![]() Changing LED brightness using digital output Although there are only two output states, HIGH and LOW, the LED brightness can be changed with some ingenuity. Thus, the LED brightness cannot be adjusted. However, Arduino’s digital output has only two states, HIGH (5V) or LOW (0V), meaning that the voltage and resistance values cannot be changed even if the circuit is connected as-is. If you want to illuminate the LED even brighter, you either “reduce the resistance” or “increase the voltage”, as explained in the previous formula for the relationship between the current flowing through the LED and the resistance. If 5V and 3.3V are applied, 5V makes the LED light brighter. ![]() Alternatively, the current that flows also changes if you change the power supply voltage connected to the LED. Comparing a 330Ω resistor to a 10kΩ resistor connected to adjust the amount of current connected to the LED, for example, more current flows through 330Ω with the smaller resistance, which causes the LED to light up more brightly. Brightness cannot be digitally adjustedĪs we explained last time, the LED brightness changes depending on the flowing current. We will also learn how to write a program that uses the PWM output to gradually light up the LED. In this article, we will learn how to use the PWM to adjust the brightness of the LED. The PWM can be used to adjust the brightness of the LED by repeatedly switching between HIGH and LOW states. Instead, for this purpose, you can use the “PWM” output. However, since digital output can only be output in either of two states, you cannot adjust controls such as brightness. You can easily switch an LED on and off between HIGH (5V) and LOW (0V) states by connecting it to Arduino’s digital output terminals. In this article, we bring you the “key” basics of Arduino electronics through enabling Arduino to adjust LED brightness. This article was translated to English, and was originally published for deviceplus.jp.ĭevice Plus has introduced a variety of applications and examples of Arduino, but basic knowledge is still important no matter what you make!
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