This line is declared your LED positive pin connected to Arduino digital pin 6 and named as analogOutPin.ĭefine two variables sensorValue and outputValue. This line is declared your potentiometer output pin connected to Arduino analog pin “A0” and named as analogInPin. LED Brightness Control Using Potentiometer Code/sketch /*Īrduino Tutorial #7 - LED Brightness Control Using Potentiometer LED Brightness Control Using Potentiometer Circuit diagram / Schematic LED Brightness Control Using Potentiometer Circuit Diagram Circuit Wiring Components PinsĬonnected to Arduino Digital pin “D5” through a 220-ohm resistor. toHigh: It is the upper bound of the output voltage range.toLow: This is the lower bound of the output voltage range.fromHigh: It is the upper bound of the input voltage range.fromLow: This is the lower bound of the input voltage range.Map(value, fromLow, fromHigh, toLow, toHigh) The function also handles negative numbers well, so that this example Note that the “lower bounds” of either range may be larger or smaller than the “upper bounds” so the map() function may be used to reverse a range of numbers, for example That is, a value of fromLow would get mapped to toLow, a value of fromHigh to toHigh, values in-between to values in-between, etc. Re-maps a number from one range to another. LED Brightness Control Potentiometer Input vs LED Output Voltage Graph What is the map( ) Function in Arduino Code The LED brightness changes from Low to High according to the change of the PWM output value from 0 to 255. Where the value “0” represents “0 volts” and 255 represents “5 volts”. This pin provides analog results with digital means at the range of 0 to 255. Potentiometer Internal Construction and Symbol Digital output on the LEDĪnother side, the positive terminal of the LED is connected to the PWM(Pulse Width Modulation) pin. When we will Rotate the potentiometer knob, then the output voltage is changed and the Arduino reads this change of output voltage as the input voltage. Where the value “0” represents “0 volts” and the value “1023” represents “5 volts”. ![]() ![]() Arduino analog pin has 10-bit Analog to Digital Converter(ADC), which converts the potentiometer output voltage into integer value between the range of 0 to 1023 volts (2^10 = 1024) as input. Now we can read the output from terminal 2 of the potentiometer, and we need to connect this terminal to an analog pin of the Arduino board. Also, use the map( ) function in the Arduino code.įirst of all, we need to connect the Potentiometer terminal 1 is connected to +5v Vcc, and terminal 3 is connected to the ground. Here we will read analog output from the potentiometer using Arduino and control the LED using PWM output. This project concept is based on the “Arduino AnalogRead using the Potentiometer” and “ Digital pin PWM output | Arduino LED Fading“, which is explained in the previous tutorials. In this project, we will control LED brightness using the Potentiometer. Project Concept of LED Brightness Control
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