R3 PLUS

Compatible with Arduino UNO R3, Onboard MCU ATMEGA328P-AU

R3 PLUS Package A

Compatible with Arduino UNO R3, Onboard MCU ATMEGA328P-AU, Comes with Various Sensors

Introduction

Compatible with Arduino UNO R3, Onboard MCU ATMEGA328P-AU

More

Feature

High performance, low power Atmel AVR 8-bit microcontroller family chips.
Advanced RISC architecture.
Up to 20mips throughput at 20MHz.
32KBytes of in-system programmable Flash program memory.
2KBytes of internal SRAM.
Flexible power supply options:
- USB power supply; - External input power VIN (6V<=VIN<=12V).

4 LEDs:
- Power indicator PWR, USER LED, serial receive indicator RX and transmit indicator TX;

External high-speed crystal oscillator:
- 16 MHz crystal oscillator.

USB to the virtual serial port.
ICSP interface, used as SPI interface.

Hardware

ATMEGA328P-AU
AMS1117-3.3
3.3V voltage regulator
NCP1117ST50T3G
5V voltage regulator
FT232RL
USB to UART convertor
Arduino interface
compatible with standard Arduino interface with two additional analog inputs A6 (config the CFG), A7

solder pads provided, supports prototype breadboard
ICSP interface
MICRO USB connector
for uploading program OR serial port debugging
Power output header
3.3V OR 5V, voltage level configured by the onboard power configuration switch, used as power output OR common-grounding with other boards
FT232 pins
for burning Bootloader into the microcontroller
DC input
7V ~ 12V
Reset button
Power indicator
Serial port Rx/Tx indicator
User LED
500mA fast auto-recovery fuse
Power configuration
for configuring the operating voltage
Bootloader selection switch
turn ON: the board will reset when power-up OR other USB devices were detected connecting to the PC

turn OFF: the onboard program runs immediately when power-up, and the board will not reset when other USB devices were detected connecting to the PC

Pinouts

Dimension

Related board

IO Expansion Shield

Write Bootloader by FT232

Hardware connection

Connect R3 PLUS accoridng to figure:

Figure 1. R3 PLUS Hardware connection -Bootloader

Configure avrdude-GUI

1) Download and unzip FT232RL AVRDUDE archive(can be found in Resources), Open the avrdude-GUI (saved in avrdude-GUI-1.0.5 folder):

Figure 2. avrdude-GUI software

2) Input the avrdude path in Avrdude.exe File, you can also browse the path by clicking the ... icon on the right.
3) Choose FT232R Synchronous BitBang (diecimila) in Programmer list.
4) Choose the CPU in the Device list. The R3 PLUS board uses ATmega328P-AU chip, we choose ATmega328P(m328p) here.
5) Input the interface information in Command line Option: -P ft0.

Figure 3. Configure avrdude-GUI

Configure R3 PLUS FUSE

1) Click the Read icon in Fuse and Lock Bit to read the Fuse bit of the chip:

Figure 4. Read fuse

2) The Fuse bit read above may not be the expected one, and here is the recommended configuration of Arduino:

high_fuses=0xde
low_fuses=0xff
extended_fuses=0x05
lock_bits=0x0F
unlock_bits=0x3F

Note: You can find the fuse configuration of different versions in boards.txt which is saved in the hardware\arudino folder in the Arduino IDE installation directory. You can configure the fuse if required.
If the fuse bit read is different from recommended, you should re-configure the fuse and write it to CPU.

Write Bootloader

1) Input the optiboot_atmega328-Mini.hex path to Flash, you can also browse it by clicking the ... icon on the right. The Bootloader for different versions is saved in hardware\arduino\bootloaders folder in the Arduino IDE installation directory. Here we use the optiboot\optiboot_atmega328-Mini.hex file.
2) Click Erase-Write-Verify, write the .hex file to chip, and wait for finishing.

Figure 5. Write .hex file to chip

3) After writing, cut off the power and you can use the R3 PLUS now.

Resource

Document

Software

FAQ

Question:Can't download the program normally?

Answer:

The Bootloader selection switch should be turned ON, power on the R3 PLUS, and select the correct COM port and development board.

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Question:Error when programming Bootloader?