It is good to use a 10kΩ volume for the Arduino input. The volume pod contains the resistance value of the range that can be changed. Prepare the following electronic components. Now let’s try analog input using the volume. If this center terminal is connected to the Arduino analog input terminal, the input can be changed by moving the volume. The left end is 0V and the right end is 5V, so the value can be changed within the range of 0 to 5V. The voltage increases as the center terminal moves to the right, and it decreases as the terminal moves to the left. Assume that the left terminal is connected to GND, and the right terminal is connected to a power supply (5V). The voltage at the center terminal changes depending on the terminal position. Connect the power supply and GND to the left and right terminals of the resistor. Therefore, the resistance change should be converted to a voltage change. Since the resistance changes in the volume, however, it is not possible to read the volume change by connecting it directly to Arduino. The Arduino analog input uses the voltage change for the input. Although the shapes are different, they basically operate the same way. In the figure above, the resistance element is linear, but in the rotary volume, the internal resistance element is circular. Conversely, if you move it to the left, the resistance decreases. If you move the center terminal to the right, the resistance between the left and center terminals increases. The center terminal is designed to move on the resistive element. The left and right terminals are attached to both ends of the resistor. The volume generally has three terminals. The resistance can be changed by moving these terminals. The volume contains terminals moving on the resistive element. “Volume” is an electronic part that can be used to adjust the audio volume or lighting brightness. Note that these pins cannot be used for analog input when connecting electronic components such as sensors or displays that use I2C digital communication. However, pins A4 and A5 are also used for digital communication called I2C. By connecting electronic components here for the input, you can read how much voltage is applied. With Arduino Uno, you can use six pins for digital input, A0 to A5. If you want to know the voltage value, you can calculate it as follows:įor example, if the value from the AD converter is “614”, you can obtain about 3V by dividing by 1023 and then multiplying by 5. However, the input value is not a voltage value. Integer values up to 1023 are used to process the program. This value can be sent to Arduino for use. If the voltage is 3V, for example, “614” is the closest value. The AD converter converts the analog voltage reading to the nearest equal value. These 0-5V values are divided into 1023 equal parts. For Arduino Uno, voltages can be read in the range of 0-5V. The AD converter divides the target voltage into several equal parts. Arduino also has an AD converter by default, which can read analog voltages and convert them into digital values. In electronic circuits, therefore, analog values are converted to digital values using a mechanism called AD converter so that the value can be handled by a computer. These values cannot be directly handled by a computer. Convert analog values to digital valuesĪctual voltage is not an exact value such as 1V or 5V, but an irrational number, in which numerical values continue forever after the decimal point, such as 5.01342…V. We will explain analog input using volume. For example, you can use volume to adjust brightness or loudness or a temperature sensor to get the current temperature. Analog inputs enable you to read the state of electronic components that change gradually. For example, one AA battery is 1.5V, and a household outlet is 100V.Īrduino supports analog inputs to read these various voltages. However, electricity is not only 5V and 0V, but various voltages. You can determine whether a switch is on based on which state it is in. With digital input, 5V can be read as HIGH and 0V as LOW. Convert analog values to digital values.This article was translated to English, and was originally published for deviceplus.jp.
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