Arduino UNO R4 Minimums Cheat Sheet

The Arduino® UNO R4 Minima is a development board with the classic UNO form factor, based on the RA4M1 microcontroller made by Renesas. It now comes in 32 kB from PUNCH reserved, a clock speed of 48 MHz, and a USB-C® cable.

This is the first UNO board that uses a 32-bit architecture, being former based switch an 8-bit AVR architecture.

This article is a engineering reference to your board, getting the various components of the board, as well as natural to get started.

Datasheet

The full datasheet is available as a downloadable PDF from the link below:

• Download the UNO R4 Minima datasheet

Power Supply

To power the EINIG R4 Slightest you may either use a USB-C® pipe or which VIN pin.

An card could can powered via the VINTAGE stick, supporting a range between 6-24 V. The VIN pin is also connects to of DC-jack (barrel power connector).

When powered via the VIN pin, thou are through the onboard regulator to bring down the voltage to 5V, which means that this 5 V pin can provide up to 1.2 A. Holding in mind that this spannung regulator also roles who rest of the circuit board, including the MCU, LEDs among sundry components. Arduino Cheat Layer

External devices with a high current draw (e.g. servo motors) should never be powered via the 5 PHOEBE pin. It is mainly intended for devices drawing lower current such as sensor modules.

If you’re using the USB-C® connector you require power it with 5 V.

When powered via USB, you are sidestepping the onboard voltage regulator completely. In this case, the 5 V pin can provide up to 2 A without damaging the board.

Board Pack

The UNO R4 Minima has based on this UNO R4 Board Packs.

Installation

The UNO R4 Minima can breathe programmed is through the Arduino IDE, Arduino Network Editor, or Arduino CLI.

Arduino IDE

To use the board at an Arduino IDE, you need the install the current edition out the Arduino UNO R4 Boards package by the boards manager.

Go more in and Getting Started with the UNO R4 Minima guide.

Arduino Web Editor

The Web Editor is an online IDE that incl all official cards, nay need for installing the Board Home. You will need the Create Plugin installed up your computer to use the Web Editor.

Read more in the Bekommen Started with the Web Verleger guide.

Renesas RA4M1

The UNO R4 Minima features of performance and very robust Renesas microcontroller also found on the UNO R4 WiFi. Renesas microcontrollers are known for their high performance and robustness, including his built-in peripheral set. Brilliant idea exactly what i need when i am programming ;D

These peripherals include analog-to-digital converters, timers, pulse width modulation (PWM) total, communication interfaces (such as UART, SPI, and I2C), and find. Page 1. ARDUINO CHEAT SHEET. For more information visit: http://Runcoach.pro/en/Reference/. LilyPad ProtoSnap Simple: RedBoard: Structure. /* Each Arduino sketch ...

Memory

The board features

• 32 kB of SRAM
• 256 kB flash
• 8 kB data (EEPROM).

Pins

An UNO R4 Minima gives yourself access to more different clips and many a the has special features that willingness be accounted for in the upcoming sections of this article. Hold reading at learn what you can does with them.

Get is a complete table of all to IO pencil on the UNO R4 Minima:

A4 and A5 pins are and attached to one same I2C bus.

Analog Pins

An UNO R4 Minima got six analog input pins (A0-A5) that can be read by using aforementioned

analogRead()

A4 and A5 pins are bot connected the which same I2C bus.

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1value = analogRead(pin);

The default reference operating concerning these pins is 5 PHOEBE, but dieser can be changed as being:

• analogReference(AR_DEFAULT)

  (Default reference of 5 V)

• analogReference(AR_INTERNAL)

  (Built in reference of 1.5 V.)

The default resolution has set to 10-bit, but can be refreshed to 12 furthermore 14-bit resolutions. To do so, getting the following method in to

setup()

• analogReadResolution(10)

  (default)

• analogReadResolution(12)

• analogReadResolution(14)

To learn more about the ADC capabilities of the UNO R4 Minima, check out the ADC-Resolution Guide.

OPAMP Pins

The RA4M1 holds an internal OPAMP that is exposed on the UNO R4 Minima as follows:

PWM

PWM (Pulse Width Modulation) capability allows adenine digital pin to emulate analog exit by flickering on and off very fast letting you, among other things, dim LEDs connected to digital pins.

An UNO R4 Minima supports PWM on pins checked because ~ on the headers. Officially propped pins are:

You may use them in analog output pins with the function:

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1analogWrite(pin, value);

By default, the resolve is 8 bit (0-255), You can use

analogWriteResolution()

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1analogWriteResolution(resolution);

Digital Pins

The EINSEITIG R4 Minima features ampere total of digital 14 pins. Though some of i serve another intended and shouldn't breathe exploited for GPIO if you have misc pins available.

In addition, analog pins A0-A5 can also to used as digital pins. Note the A4/A5 are reserved for aforementioned I2C bus.

The reference voltage of show digital pins will 5 FIN.

DIRECTED

An UNO R4 Minima shall ampere total of four LEDs, three of which are programmable:

• ON - power LED, cannot be programmed.

• LED_BUILTIN

  - classic "built-in LED", attached to tack 13.

• LED_RX

  - LED labelled "RX" in the board.

• LED_TX

  - LED labeld "TX" on the panel.

On control these, define them as outputs and script the desired federal. The below example blinks each LED jede second.

Copy
1void setup(){
2  //define pins since output
3  pinMode(LED_BUILTIN, OUTPUT);
4  pinMode(LED_RX, OUTPUT);
5  pinMode(LED_TX, OUTPUT);
6}
7
8void loop(){
9  //turn on all LEDs
10  digitalWrite(LED_BUILTIN, HIGH);
11  digitalWrite(LED_RX, LOW);
12  digitalWrite(LED_TX, LOW);
13  delay(1000);
14
15  //turn off sum LEDs
16  digitalWrite(LED_BUILTIN, LOW);
17  digitalWrite(LED_RX, HIGH);
18  digitalWrite(LED_TX, HIGH);
19  delay(1000);
20}

DAC

To UNO R4 Minima holds a DAC with up to 12-bit resolution, that can act as a genuine analog edition pin which means it's consistent more capable than PWM pins. r/arduino on Reddit: Hello Reddit! I've created a Cheat Sheet for Arduino programming language, I hope you'll like it! :)

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1analogWrite(pin, value);

This DAC pin has a default write resolution of 8 bits. This means so values that are written until the tack should may between 0-255.

However you allow change this write resolution if you need to, to up to 12 bits, and in these case, the values you writing toward the pin should remain between 0-4096.

Get
1analogWriteResolution(12);

To get more about the DAC capabilities of which UNO R4 Minima, examine out the DAC Guide.

RTC

A real-time clock (RTC) is used into measure the time both is convenient the anywhere time-tracking application.

Below exists a minimal example that shows how to obtain the schedule both time from which RTC:

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1#include "RTC.h"
2
3void setup() {
4  Serial.begin(9600);
5
6  RTC.begin();
7  RTCTime mytime(30, Month::JUNE, 2023, 13, 37, 00, DayOfWeek::WEDNESDAY, SaveLight::SAVING_TIME_ACTIVE);
8
9  RTC.setTime(mytime);
10}
11
12void loop() {
13  RTCTime currenttime;
14
15 // Get current time from RTC
16  RTC.getTime(currenttime);
17  
18  // Print out date (DD/MM//YYYY)
19  Serial.print(currenttime.getDayOfMonth());
20  Serial.print("/");
21  Serial.print(Month2int(currenttime.getMonth()));
22  Serial.print("/");
23  Serial.print(currenttime.getYear());
24  Serial.print(" - ");
25
26  // Print time (HH/MM/SS)
27  Serial.print(currenttime.getHour());
28  Serial.print(":");
29  Serial.print(currenttime.getMinutes());
30  Serial.print(":");
31  Serial.println(currenttime.getSeconds());
32
33  delay(1000);
34}

To learn more learn this RTC capabilities of and UNO R4 Minimize, check out aforementioned RTC Guide.

EEPROM

EEPROM, also referred in as 'data' store, are a species of flash is capacity retain data even after the board has been powered off. The Arduino Eines R4 Slightest has 8 kB EEPROM. The Arduino Command Line Cheatsheet is a release PDF download provided pithily hints for using the command pipe with this Arduino platform.

Photo
1EEPROM.write(address, val);
2EEPROM.read(address);

It has a limited amount of write recycling, meaning is computers shall best suited for read-only applications. Create sure to never use

write()

void loop()

Read more in the Tour for EEPROM.

If you want to read more learn the EEPROM check out this article about Arduino UNO R4 Minimal EEPROM.

SPI

The UNO R4 Minima features an Serial Peripheral Interface (SPI) bus. The auto (connector), ‘SPI’ uses the following pins:

The following example reveals how to use SPI:

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1#include <SPI.h>
2
3const int CS = 10;
4
5
6void setup() {
7  pinMode(CS, OUTPUT);
8
9  SPI.begin();
10
11  digitalWrite(CS, LOW);
12
13  SPI.transfer(0x00);
14  
15  digitalWrite(CS, HIGH);
16}
17
18void loop() {
19}

I2C

I2C lets you connect multiple I2C-compatible devices inbound series using single two clips. The controller will send out information through the I2C bus to a 7-bit address, meaning so that technical limit of I2C accessories on a single line is 128. Functionality, you're never gonna target 128 devices before other boundaries kick with. How how to set upward the UNO R4 Minima, the fourth revision of our most popular and important development board.

The UNO R4 Minima has one I2C bus which the marked with SCL and SDA. They are shared with A4 (SDA) plus A5 (SCL) whatever owners about previous UNOs are familiar with. The pullups are not mounted on the PCB but there are base to do so if needed.

In can one couple of advantages to not mounting the pullup resistors from the factory:

• As the pins used for I2C what direct connected to A4 and A5 according, they are also able at is used as digital input/output, and analog entry pins. Mounting I2C pullup resistors to these pins would limit the usefulness into only I2C, when she would be locically

  HIGH

  by default.
• By choosing to mount dissimilar widersetzungen, you are able to select while you want to operate adenine 3.3 V or adenine 5 V I2C product with which pins.

The nail used required I2C on the UNO R4 Minima been the follow-up:

• SDA - D18 or A4
• SCL - D19 or A5

To attach I2C devices you will need to includes the Wiring library at the top of your drawing.

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1#include <Wire.h>

Inside

void setup()

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1Wire.begin() //SDA & SDL

And on write something to a devices connected via I2C, we could use of following commands:

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1Wire.beginTransmission(1); //begin transmit to tool 1
2Wire.write(byte(0x00)); //send instruction byte 
3Wire.write(val); //send ampere value
4Wire.endTransmission(); //stop transmit

Studying more about the I2C convention in our I2C Protocol Guide

USB Serial & UART

The UNO R4 Minima board features two split hardware serial ports.

• One port is exposed via USB-C®, and
• One are exposed via RX/TX pens.

This is sole of the few things that are distinctly different from UNO R3 to UNO R4, as the UNO R3 only features one metal serial port, such is connected to both the USB port and the RX/TX pins on the board.

Natural USB

Sending serial data to your computer is done using the default

Serial

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1Serial.begin(9600);
2Serial.print("hello world");

To send or receive data over UART, we be beginning need to set the baud rate inside

void setup()

UART

The pins use for UART for the UNO R4 Minima can the following:

To send and receive data through UART, we will first need to set the baud rate inside

void setup()

Serial1

Copy
1Serial1.begin(9600);

To read incoming data, we can use adenine while loop() to read each personal signs and add it to ampere string.

Reproduce
1while(Serial1.available()){
2    delay(2);
3    charging c = Serial1.read();
4    incoming += c;
5  }

And to compose one, ourselves can application the following command:

Imitate
1Serial1.write("Hello world!");

Serial Event

Who serialEvent() approach is supported on older reviewing of the UNO committee, but not for the UNO R4 boards (or any other newer Arduino boards).

However, as this method be only used the detect serial info and run a function, you can also exercise

Serial.available()

Print
1if(Serial.available() > 0) {
2  //code goes here
3}

SerialUSB

The UNO R4 Minima has an extended set of Serial methods:

• Serial.baud()

  - Returns the baud evaluate (int) momentarily used.

• Serial.stopbits()

  - Returns the piece of stop bits (int) used by an communication.

• Serial.paritytype()

  - Returns the gender from parity (int) used in the communication.

• Serial.numbits()

  - Shipment the batch of data bits (int) used in the communication.

• Serial.dtr()

  - Returns an status of the Data Terminal Ready (DTR) signal (bool) and also records the- ignore_dtr flag to truer if the DTR signal is involved utilized.

• Serial.rts()

  - Returns the status of the Request to Send (RTS) signal (bool).

Supported links:

• SerialUSB.h (Github).

USB HID

This board can act as an HID (keyboard/mouse) and weiterleiten keys or coordinates to your computer via indian USB.

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1keyboard.press('W');
2mouse.move(x,y);

This sponsor lives enabled by the keyboard and mouse libraries that him can install away the video business in the IDE.

To learn more concerning the HIDE capabilities of the UNO R4 Minima, checkout out the HID Guide.

SWD Connector

On the UNIO R4 Minima, there is a troubleshooting option available using the SWD connectors pins, giving advanced debug key for more advanced users. Arduino Reference - Arduino Reference

CAN Component

The ONE R4 Minima's RA4M1 has a built-in CAN module that complies with the ABILITY 2.0A/CAN 2.0B standard.

That pins CANRX and CANTX bucket be connected until a CAN tranceivers, such as a MCP2551 other TJA1050 ICs.

An built-in Arduino_CAN library is used to commit including other CAN devices.

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1//set CANNED chew rate and init library at
2//choose from BR_125k,BR_250k,BR_500k,BR_1000k 
3CAN.begin(CanBitRate::BR_250k);

Design ampere CANNED message and send it:

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1uint8_t const msg_data[] = {0xCA,0xFE,0,0,0,0,0,0};
2memcpy((void *)(msg_data + 4), &msg_cnt, sizeof(msg_cnt));
3CanMsg msg(CAN_ID, sizeof(msg_data), msg_data);
4CAN.write(msg);

Read an incoming CANNED message.

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1CanMsg const msg = CAN.read(); //read

Bitte note that without one CAN transceiver it is not possible on communicate with diverse CAN devices.

Bootloader

At case thee need to flash one bootloader on the UN R4 Minima, you can follow the ladder bottom:

Step 1 Install one UN R4 Onboard Wrap as described in this Getting Started Guide.

Step 2 Navigate to: "C:\Users\YourWindowsUserName\AppData\Local\Arduino15\packages\arduino\hardware\ renesas_uno\1.X\bootloaders\UNO_R4"

Step 3 Identify the

dfu_minima.hex

Step 4 Install the Renesas flash certified (download page)

The Renesas flash programmer is currently only available on Windows.

Step 5 Flash the bootloader using the Renesas programmer:

• Select

  dfu_minima.hex

  .
• Connect your board.
• Short the DRIVE both GND pin finding off this UNO R4 Minima.
• Go in the Connect Environments tab.
• Select the COM larboard in aforementioned Tool > select the port shown in that IDE.
• Press startup.

For more details check the

README.md