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| Arduino Code Reference |
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| Complete reference for Arduino programming language, functions, and libraries. |
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| <h3 class="text-xl font-bold mb-2">Digital I/O</h3> |
| <p class="text-gray-400 text-sm">pinMode(), digitalRead(), digitalWrite()</p> |
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| <h3 class="text-xl font-bold mb-2">Analog I/O</h3> |
| <p class="text-gray-400 text-sm">analogRead(), analogWrite(), analogReference()</p> |
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| <h3 class="text-xl font-bold mb-2">Time Functions</h3> |
| <p class="text-gray-400 text-sm">millis(), micros(), delay(), delayMicroseconds()</p> |
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| <h3 class="text-xl font-bold mb-2">Serial Communication</h3> |
| <p class="text-gray-400 text-sm">Serial.begin(), Serial.print(), Serial.read()</p> |
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| <h3 class="text-xl font-bold mb-2">Advanced I/O</h3> |
| <p class="text-gray-400 text-sm">shiftOut(), pulseIn(), tone(), noTone()</p> |
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| <h3 class="text-xl font-bold mb-2">WiFi & IoT</h3> |
| <p class="text-gray-400 text-sm">WiFi library, ESP8266, ESP32 functions</p> |
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| <h3 class="text-xl font-bold mb-2">I2C & SPI</h3> |
| <p class="text-gray-400 text-sm">Wire library, SPI communication protocols</p> |
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| <h3 class="text-xl font-bold mb-2">Libraries</h3> |
| <p class="text-gray-400 text-sm">Built-in and contributed libraries</p> |
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| <h2 class="text-3xl font-bold mb-8 text-center">Most Popular Functions</h2> |
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| <h3 class="text-2xl font-bold text-cyan-400">pinMode()</h3> |
| <span class="px-3 py-1 bg-cyan-500/20 text-cyan-400 rounded-full text-sm">Digital I/O</span> |
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| <p class="text-gray-300 mb-6">Configures the specified pin to behave either as an input or an output.</p> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Syntax</h4> |
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| <code class="text-cyan-400">pinMode(pin, mode)</code> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Parameters</h4> |
| <ul class="text-gray-400 space-y-1"> |
| <li><code class="text-cyan-400">pin</code>: the Arduino pin number</li> |
| <li><code class="text-cyan-400">mode</code>: INPUT, OUTPUT, or INPUT_PULLUP</li> |
| </ul> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Example</h4> |
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| <pre class="text-gray-300 text-sm"><code>void setup() { |
| pinMode(LED_BUILTIN, OUTPUT); // sets the digital pin 13 as output |
| } |
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| void loop() { |
| digitalWrite(LED_BUILTIN, HIGH); // turns the LED on |
| delay(1000); // waits for 1 second |
| digitalWrite(LED_BUILTIN, LOW); // turns the LED off |
| delay(1000); // waits for 1 second |
| }</code></pre> |
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| <h3 class="text-2xl font-bold text-purple-400">digitalWrite()</h3> |
| <span class="px-3 py-1 bg-purple-500/20 text-purple-400 rounded-full text-sm">Digital I/O</span> |
| </div> |
| <p class="text-gray-300 mb-6">Write a HIGH or LOW value to a digital pin.</p> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Syntax</h4> |
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| <code class="text-purple-400">digitalWrite(pin, value)</code> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Parameters</h4> |
| <ul class="text-gray-400 space-y-1"> |
| <li><code class="text-purple-400">pin</code>: the Arduino pin number</li> |
| <li><code class="text-purple-400">value</code>: HIGH or LOW</li> |
| </ul> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Example</h4> |
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| <pre class="text-gray-300 text-sm"><code>int ledPin = 13; // LED connected to digital pin 13 |
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| void setup() { |
| pinMode(ledPin, OUTPUT); // sets the digital pin as output |
| } |
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| void loop() { |
| digitalWrite(ledPin, HIGH); // sets the LED on |
| delay(1000); // waits for a second |
| digitalWrite(ledPin, LOW); // sets the LED off |
| delay(1000); // waits for a second |
| }</code></pre> |
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| <h3 class="text-2xl font-bold text-green-400">analogRead()</h3> |
| <span class="px-3 py-1 bg-green-500/20 text-green-400 rounded-full text-sm">Analog I/O</span> |
| </div> |
| <p class="text-gray-300 mb-6">Reads the value from the specified analog pin. Arduino boards contain a multichannel, 10-bit analog to digital converter.</p> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Syntax</h4> |
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| <code class="text-green-400">analogRead(pin)</code> |
| </div> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Parameters</h4> |
| <ul class="text-gray-400 space-y-1"> |
| <li><code class="text-green-400">pin</code>: the analog input pin number</li> |
| </ul> |
| </div> |
| </div> |
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| <h4 class="text-lg font-semibold mb-2 text-white">Example</h4> |
| <div class="bg-gray-900 rounded-lg p-4"> |
| <pre class="text-gray-300 text-sm"><code>int analogPin = A3; // potentiometer wiper (middle terminal) connected to analog pin 3 |
| // outside leads to ground and +5V |
| int val = 0; // variable to store the value read |
|
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| void setup() { |
| Serial.begin(9600); // setup serial |
| } |
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| void loop() { |
| val = analogRead(analogPin); // read the input pin |
| Serial.println(val); // debug value |
| }</code></pre> |
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