#ARDUINO UNO PORT MAP SERIAL#
#ARDUINO UNO PORT MAP CODE#

#ARDUINO UNO PORT MAP SERIAL#

SPI: Serial Peripheral Interface OC: Output Compare (used for PWM outputs) TXD: Transmitter Data (Serial communication output) RXD: Receiver Data (Serial communication input) To understand the correspondence between the Arduino Uno pins and the Atmega328P microcontroller pins, refer to the following table: Arduino Pinĭigital I/O, Timer/Counter1 input capture Source: Mapping Arduino Pins to Atmega328P Pins: These pins can detect changes in voltage levels and trigger interrupts, allowing you to respond to external events promptly. The Arduino Uno has two pins, labeled 2 and 3, that can be used as external interrupt pins. SCL (Serial Clock): Provides the clock signal for synchronization in I2C communication.

SDA (Serial Data): Carries the data signal for bi-directional communication between the Arduino and other devices. The Arduino Uno supports I2C (Inter-Integrated Circuit) communication through two pins: a. SS (Slave Select): Enables communication with specific SPI devices when multiple devices are connected. SCK (Serial Clock): Provides the clock signal for synchronizing data transfer. MISO (Master In Slave Out): Used for data transmission from other devices to the Arduino. MOSI (Master Out Slave In): Used for data transmission from the Arduino to other devices. The Arduino Uno features dedicated pins for Serial Peripheral Interface (SPI) communication. By connecting this pin to ground momentarily, you can reset the microcontroller and start your program execution from the beginning. The reset pin (RESET) is used to restart the Arduino Uno. These pins can be used to control the brightness of LEDs, drive motors at variable speeds, and generate audio tones. PWM allows you to control the intensity of digital signals by rapidly switching them on and off. The Arduino Uno has six pins (3, 5, 6, 9, 10, and 11) that support Pulse Width Modulation (PWM). They are connected to the ground of the power supply and must be connected to complete electrical circuits. GND: The ground (GND) pins serve as the common reference for electrical signals. These pins can be used to power external sensors or other low-power devices that require these voltages. 5V and 3.3V: The Arduino Uno provides a regulated 5-volt output (5V) and a 3.3-volt output (3.3V). The analog input pins use a 10-bit analog-to-digital converter (ADC), providing 1024 discrete levels of resolution.

They are primarily used to interface with analog sensors such as temperature sensors, light sensors, and potentiometers. These pins can be used to measure analog voltages ranging from 0 to 5 volts. The Arduino Uno includes six analog input pins labeled A0 to A5. They support digital signals (HIGH or LOW) and can be used for reading switches, buttons, or sensors, as well as controlling LEDs, relays, and other digital devices. These pins can be configured as either inputs or outputs, allowing you to interface with various electronic components. I now use port control for all my projects and the results are way better.The Arduino Uno features 14 digital input/output (I/O) pins labeled from 0 to 13.

#ARDUINO UNO PORT MAP CODE#

The difference in time is amazing, so if your code needs a lot of speed, using register control is a lot faster. Now the pulse is only 64ns that is 60 times faster than before. I zoom in and now the pulse is a lot shorter. I upload this second code using register control. But why so long? There is no delay between HIGH and LOW so why isn’t this in the range of ns? Well, that’s because we are using digital write which is a function of Arduino and this takes a while to execute. Each 5ms we have a short pulse but if I make a zoom in and I measure the width of this pulse, we can see it is 4 us. I upload this code to the Arduino and connect my oscilloscope to pin D9. 1 second divided by 16Mhz is 62 nanoseconds.

This Arduino works at a speed of 16Mhz, and since there is no delay between the LOW and HIGH state of the pin, this code should create a very, very, short pulse.

The void loop will repeat itself over and over. Then in the void loop, using digitalWrite(), I put that pin to HIGH and then with no delay in between I put the pin to LOW and then I place a delay of 5ms. In an empty Arduino code, I set pin 9 as output.

Arduino uno port map