How Much Current Does An Arduino Uno Draw

Overview

The Arduino Uno R3 is an open up source hardware computing platform. It uses the ATmega328 microcontroller. The board also incorporates the ATmega16u2 to act every bit a onboard USB to series converter.

The Arduino Uno R3 tin be used to develop applications that operate in a standalone or connected enviroment. The device is programmed using the Arduino integrated development enviroment (IDE).

Board Layout

Features

• ATmega328 microcontroller
• Input Voltage betwixt 7 - 12V
• 14 Digital Inputs of which six provide a PWM (Pulse Width Modulated) Output
• 6 Analog Pins
• 40mA DC electric current per I/O pin
• 50mA DC current for 3.3V Pin
• 32KB Wink Memory (0.5KB used past the bootloader
• 2KB SRAM
• 1KB EEPROM
• 16MHz Clock Speed

Power

You can power the Arduino board via the USB connector or via the DC ability jack. The power jack is ii.1mm center powered.

You lot tin can use betwixt 6V and 20V DC to ability the board. Information technology is recommended that you should not go below 7V to let for the voltage drop across the power regulator. If you go besides depression then the regulator output might driblet below 5V and this tin cause issues with the boards functioning.

Information technology is also recommended that y'all do not go above 12V. The power regulator may over rut and crusade damage to the board.

Power and Aux I/O Port

The pins are used as follows:

• 5V: This is a regulated output from the on board voltage regulator. This ability will come from either the USB or DC input jack. This is fed into the on board 5V voltage regulator. The output from the regulator is connected to this pin. You utilise this pin to provide 5V to ability components continued to the Arduino board. The maximum electric current depict is approx 400mA on usb and higher if using the DC power jack.
• 3.3V: This is a regulated output from the on board voltage regulator. The output from the 3.3V regulator is connected to this pin. Y'all utilize this pin to provide 3.3V to power components connected to the Arduino board. The maximum current draw is 50mA

• You tin can power the board by connecting a regulated 5V source to the 5V pin or 3.3V to the 3.3V Pin. The ability volition go directly into the ATMega328 micro controller. The on board power regulators are bypassed. If something goes wrong here and then you could very easily impairment the ATMega328 chip. Arduino advise confronting powering the lath this mode.

• GND: Board ground as fed from the ground pins on the DC input jack and the USB connector. Utilise this footing for components connected to the Arduino board.
• VIN: This pin is connected to the input side of the on lath voltage regulators. Whatever input DC is supplied to the board by the DC input jack will also announced on the VIN pin. Yous could also connect ability to the board using this pin instead of the USB or DC input jack. Because it is connected to the input side of the voltage regulators the regulated 5V and 3.3V Dc will be supplied to the lath.
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Input and Outputs

There are xvi digital pins on the Arduino lath. They tin be used as inputs or outputs. They operate at 5V and have a maximum current draw of 40mA. They have an internal pull upwardly resistor that is disabled by default. The pullup resistors are betwen 2 - 50kOhms and tin be enabled via software.

We can command the digital I/O pins using the pinmode(), digitalWrite() and digitalRead functions.

Some of the digital I/O pins accept additional functions:

• Serial: Pin 0 (RX) and 1 (TX). These pins are used to transmit and receive series TTL (5V) data. These pins are besides connected to the Atmega16u2 USB to Series TTL chip on the Arduino board.
• PWM: Pins 3,5,vi,nine,10 and eleven. The pins can provide a PWM (Pulse Width Modulated) 8 fleck output. We use the analogWrite() function with a value between and 0 and 255 to command the duty cycle of the output.
• SPI: Pivot 10 (SS), 11 (MOSI), xiii (SCK) are used to provide SPI (Serial Peripheral Interface) communications using the SPI library
• External Interrupts: Pins 2 and 3 can be configured to trigger a interrupt on the betoken going depression or on a ascent or falling border. We use the attachInterrupt() function to enable interrupts.
• LED: There is a LED connected to Pin xiii. When the output on pin thirteen is loftier the LED will be turned on. The LED will be turned off when the output is depression.

The Arduino Uno has 6 analog inputs that are labled A0 through to A5. Each of these Analog pins have 10 bits of resolution which translates from 0 to 1024 unlike values. Past default they measure from ground to five volts. It is possible to extend the range using the AREF pin and the analogReference() function. Some of these pins have additional functionality.

• TWI: A4 or SDA pin and A5 or SCL pin. These pins are used to back up TWI communications using the Wire library.
• AREF: Used to provide a reference voltage for the analog inputs. Used with analogReference().
• RESET: By bringing this line LOW information technology will reset the ATMega328 micro controller. Can be wired to shields to provide a reset push when the reset button on the Arduino Uno is blocked by the shield.

Using Analog Pins equally Digital Pins

We tin can configure the Analog I/O pins to office the same as Digital pins. The Analog to Digital pivot mappings are as follow:

• A0 => Digital Pin 14
• A1 => Digital Pin 15
• A2 => Digital Pin xvi
• A3 => Digital Pin 17
• A4 => Digital Pivot 18
• A5 => Digital Pin 19

Nosotros tin can now use the pinmode control to define the pin equally a INPUT or OUTPUT. So for pin AO we would utilize 14 as the pin value. To write to the pin we would utilize digitalWrite with the appropiate digital pivot value equally shown in the list above.

Communications

The Arduino has several modes of communications.

• USB: The Arduino Uno uses an onboard ATmega16U2 to connect the series TX and RX pins on the ATmega 328. The 16u2 replaces the FTTI usb scrap used on other boards. This serial data is sent out by the USB chip to appear equally a virtual com port on the calculator connected to the USB port. The Arduino IDE Serial monitor also uses the USB port to send series data to and from the Arduino board. The TX and RX leds will flash when data is sent and received via the USB port.
• Serial TTL: The Arduino Uno board has a TTL level (5V) serial communications on the digital pins 0 (RX) and 1 (TX). This could also be connected to a RS232 or RS484 chip to provide series communications to some other device. Note: The onboard TX and RX leds volition Non flash when using serial comms on digital pins 0 and one. These LEDS are USB comms only.
• I2C and SPI communications: The Arduino Uno supports both of these serial communication formats. Use the Wire library for the I2C passenger vehicle. Employ the SPI library for the SPI passenger vehicle.

USB Overcurrent Protection

In that location is a resettable polyfuse that protects the USB port from shorts and over electric current on the Arduino board. If more than than 500mA current is pulled from the USB port it will polyfuse will trigger and pause the connection to the USB power. Once the brusque of overcurrent is removed and then the polyfuse will reset.

Source: http://cactus.io/platform/arduino/arduino-uno

Posted by: johnsonbefteeprishe.blogspot.com

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