AVR development board designed for ATMEL mega AVR, features the ATmega128 MCU, and integrates various standard interfaces, pretty easy for peripheral expansions.
OpenM128 is an AVR development board that features a ATmega128 device as the microcontroller. It supports further expansion with various optional accessory boards for specific application. The modular and open design makes it the ideal for starting application development with AVR microcontroller.
What's On Board
- ATmega128A-AU:the high performance AVR MCU which features:
- Core: AVR 8-bit RISC
- Operating Frequency: 16MHz Max
- Operating Voltage: 2.7-5.5V
- Package: TQFP64
- I/Os: 53
- Memories: 128kB Flash, 4kB SRAM, 4kB EEPROM
- Communication Interfaces: 1 x SPI, 1 x TWI (I2C), 2 x USART, 8 x PWM, 8 x ADC
- Debugging/Programming: JTAG/ISP
- AMS1117-3.3: 3.3V voltage regulator
- Power switch
- Power indicator
- LEDs: convenient for indicating I/O status and/or program running state
- User keys: for I/O input test and/or program control
- Joystick: five positions
- Reset button
- Crystal oscillator: 7.3728M & 32.768K
- Adjustable resistor: for LCD12864 contrast adjustment
- 16 I/Os interface: for connecting accessory boards which using I/O control, such as FT245 USB FIFO, 8 SEG LED, etc.
- 8 I/Os interface | 8-bit AD interface
6 I/Os interface | USART0+AC+PWM3 interface
- for connecting accessory boards which using I/O control, such as 8 Push Buttons, Motor, etc.
- there's also 8-bit AD interface can be used for AD testing
- for connecting USART peripherals, such as RS232, RS485, USB TO UART, etc.
- for connecting accessory boards which using PWM interface, also supports analog comparison through AC interface
- for connecting SPI peripherals, such as DataFlash (AT45DBxx), SD card, MP3, etc.
the SPI interface includes additional I/O pins (PWM, T/C as regular I/O) which can be used as controlling pins
- for connecting accessory boards which using PWM interface, also supports frequency calculation through T/C interface
- for connecting I2C peripherals, such as I/O expander (PCF8574), EEPROM (AT24Cxx), etc.
the I2C interface includes additional I/O pins (PWM as regular I/O) which can be used as controlling pins
- for connecting accessory boards which using PWM interface
for connecting USART peripherals, such as RS232, RS485, USB TO UART, etc. 1-WIRE interface:
for connecting 1-WIRE devices (TO-92 package), such as temperature sensor (DS18B20), electronic registration number (DS2401), etc. PS/2 interface:
for connecting PS/2 keyboard and/or mouse Graphic multi-color LCD interface:
for connecting 2.2 inch multi-color touch screen LCD which using SPI control Graphic dot matrix LCD interface:
for connecting dot matrix LCD, such as LCD12864 (3.3V blue backlight) 5V DC jack Custom crystal socket VCC power input/output:
usually used for power supply output, and/or common ground with other application board MCU pins connector:
all the MCU pins are accessible on expansion connectors for further expansion ISP6 interface:
for programming ISP10 interface:
for programming JTAG interface:
for programming/debugging LEDs jumper User keys jumper Joystick jumper PS/2 jumper LCD selection jumper
VCC selection jumper Crystal selection jumper
- short the jumper to use dot matrix LCD
- open the jumper to use multi-color LCD
For jumper 28-31:
- short the jumper to connect to I/Os used in example code;
- open the jumper to connect to other custom pins via jumper wires.
OpenM128 Development Board
Connecting to touch screen LCD
Connecting to a debugger
Connecting to various peripherals
Connecting to touch screen LCD
Connecting to dot matrix LCD12864
Connecting to RS232 Board via UART
Connecting to USB UART Board via UART
Connecting to USB FIFO Board via 16 I/Os interface
Connecting to 8-SEG LED via 16 I/Os interface
8 Push Buttons on the 8 I/Os interface
AD Keypad on the 8 I/Os interface
Connecting to EEPROM Board via I2C
Connecting to RTC Board via I2C
Multi I2C peripheral Module connected to the I2C bus
Connecting to DataFlash Board via SPI
Connecting to Micro SD Board
Connecting to any accessory board you need
The OpenM128 does NOT integrate any debugging function, a debugger is required.
Accessory boards in the photo are NOT included in the OpenM128 Standard Package.
The figures below show the header pinouts of JTAG, ISP10, ISP6 interface
10-pin JTAG header pinout
10-pin ISP header pinout
6-pin ISP header pinout
- Related Software (AVR Studio4, etc.)
- Demo Code (GCC AVR examples)
- Schematic (PDF)
- AVR Development Documentations (Datasheets etc.)