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1  Using Arduino / Microcontrollers / Arduino and ATMEGA644 - DIP 40 PINS - 64k Flash on: February 22, 2012, 03:30:24 pm

I have a problem, lack of flash memory.
I can not use "Mega" the 2560, my project has to be DIP socket.

The processor ATMEGA644 is compatible?
What needs to change to be compatible?


DIP Easy to assemble, we can use sockets.
40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF
32 Programmable I/O Lines
64K Bytes of In-System Self-programmable Flash program memory.


• High-performance, Low-power AVR® 8-bit Microcontroller
• Advanced RISC Architecture
– 131 Powerful Instructions – Most Single-clock Cycle Execution
– 32 x 8 General Purpose Working Registers
– Fully Static Operation
– Up to 20 MIPS Throughput at 20 MHz
• High Endurance Non-volatile Memory segments
– 64K Bytes of In-System Self-programmable Flash program memory
– 2K Bytes EEPROM
– 4K Bytes Internal SRAM
– Write/Erase cyles: 10,000 Flash/100,000 EEPROM(1)(3)
– Data retention: 20 years at 85°C/100 years at 25°C(2)(3)
– Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program
True Read-While-Write Operation
– Programming Lock for Software Security
• JTAG (IEEE std. 1149.1 Compliant) Interface
– Boundary-scan Capabilities According to the JTAG Standard
– Extensive On-chip Debug Support
– Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface
• Peripheral Features
– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes
– One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture
– Real Time Counter with Separate Oscillator
– Six PWM Channels
– 8-channel, 10-bit ADC
Differential mode with selectable gain at 1x, 10x or 200x
– Byte-oriented Two-wire Serial Interface
– One Programmable Serial USART
– Master/Slave SPI Serial Interface
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
– Interrupt and Wake-up on Pin Change
• Special Microcontroller Features
– Power-on Reset and Programmable Brown-out Detection
– Internal Calibrated RC Oscillator
– External and Internal Interrupt Sources
– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby
and Extended Standby
• I/O and Packages
– 32 Programmable I/O Lines
– 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF
• Speed Grades
– ATmega644V: 0 - 4MHz @ 1.8 - 5.5V, 0 - 10MHz @ 2.7 - 5.5V
– ATmega644: 0 - 10MHz @ 2.7 - 5.5V, 0 - 20MHz @ 4.5 - 5.5V
• Power Consumption at 1 MHz, 3V, 25°C
– Active: 240 μA @ 1.8V, 1MHz
– Power-down Mode: 0.1 μA @ 1.8V

2  Using Arduino / LEDs and Multiplexing / Re: Graphic LCD 12864 works on UNO? on: January 11, 2012, 07:23:06 am

Sorry all for this noob question, here is working!

This is the library:

Best regards!

3  Using Arduino / LEDs and Multiplexing / Graphic LCD 12864 works on UNO? on: January 10, 2012, 02:38:58 pm
I found that lib:

Works on UNO?

Best regards!
4  Community / Exhibition / Gallery / Re: ARDUINO EFI - 20x4 LCD boost by MAP sensor and PWM dutycycle. on: January 07, 2012, 01:27:22 pm
I do not think to invent the wheel again, this is just a prank. I have a MegaSquirt2 board here, but I would like to do something different.

This STM32F4 looks very interesting.

Has a development board, cost very interesting.

I like Arduino because is very easy to developing, do you know of any material, libraries, communities to development on this board?
5  Community / Exhibition / Gallery / ARDUINO EFI - 20x4 LCD boost by MAP sensor and PWM dutycycle. on: January 06, 2012, 11:22:49 am
I'm making a prank with an cheap Arduino made in China, I'm playing with this a few days.

The idea is:

- A 20x4 LCD providing information about Manometric Pressure in BAR.
- The sensor is a MAP MPX4250AP.
- Control the PWM timer registers dutycycle.

The concept is pulse a fuel injector by a PWM, changing the opening time by a duty cycle based by MAP pressure and VSS RPM sensor.
With this, we have a basic to control a fuel injection, I said "basic", to control a engine is necessary some more variables.

For those interested, my desire is to open an opensource project like a Megasquirt for Arduino, a very cheap and simple fuel injection

My channel:

Best regards!
6  Using Arduino / Project Guidance / Re: Two way bluetooth serial communication strategy on: January 03, 2012, 12:48:10 pm

Look my project, its a cheap US$ 6,00 Deal Extreme bluetooth module.

7  International / Portugues / Re: Modulo Bluetooth para arduino ( super compacto - super set de instruções AT) on: December 30, 2011, 02:21:22 pm
Estou usando um modulo exatamente igual, veio com outra versão de firmware. Dai eu troquei a flash para HC05 e meus problemas foram resolvidos.

Aqui um ótimo material que ensina a fazer o reflash e os comandos AT.

Fiz este teste no dia que o modulo chegou, foi quando descobri que vinha com firmware Linvor.

8  International / Portugues / Re: OFF TOPIC on: December 28, 2011, 01:26:55 pm
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