Introducing the Calunium - An Arduino clone based on the ATmega644P/ATmega1284P

Calunium built on stripboard. This version uses the ATmega644P, but the ATmega1284P can also be used. Click on the image for an annotated version.

Aims of the project

• Create an Arduino clone with more than 32K program memory.
• Produce a design which uses only through-hole components.
• Shield-compatible - with pin functionality as close as possible to the original Arduino. 

Sanguino and other related designs
How does this differ from the Sanguino and other related designs (Bobuino, Mosquino etc)? The Sanguino can't accept Arduino shields. Although it is possible to program it with the Arduino IDE the pin mapping is functionally very different to the Arduino; for example the first UART is connected to D8-D9, not D0-D1, and the SPI pins are connected to D5-D7, not D11-D13. The Bobuino looks to be a very nice design but I ruled it out as it uses surface mount components, and the ISP header is not in the standard location (as required for the Ethernet shield). The headers on the Mosquino aren't shield compatible.

Sign-Advancetech appear to make a board which appears very close to what I want - I'd probably get one if I could easily buy it in the UK.


Fritzing design files and software

Click on image for annotated version.

The Fritzing design files can be found on GitHub, http://github.com/stevemarple/Calunium. Modifications to the Arduino IDE to support Calunium are under development but will be added soon.



Calunium by Steve Marple is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.

About the name
As Arduino is an Italian project, this project takes its name from the Roman name for Lancaster, Calunium, where the design of this clone originates.

Building the Calunium
Future blog posts will show the construction of the Calunium. I also have a design for a shield-compatible strip board Arduino but I haven't had time to put it together yet.

Pin mapping

Arduino	Atmega328P	Atmega644P	ATmega2560
D0	PD0 (PCINT16/RXD)	PD0 (PCINT24/RXD0/T3)	PE0 (RXD0/PCINT8)
D1	PD1 (PCINT17/TXD)	PD1 (PCINT25/TXD0)	PE1 (TXD0)
D2	PD2 (PCINT18/INT0)	PD2 (PCINT26/RXD1/INT0)	PE4 (OC3B/INT4)
D3	PD3 (PCINT19/OC2B/INT1)	PD3 (PCINT27/TXD1/INT1)	PE5 (OC3C/INT5)
D4	PD4 (PCINT20/XCK/T0)	PB0 (PCINT8/XCK0/T0)	PG5 (OC0B)
D5	PD5 (PCINT21/OC0B/T1)	PB1 (PCINT9/CLKO/T1)	PE3 (OC3A)
D6	PD6 (PCINT22/OC0A/AIN0)	PB2 (PCINT10/INT2/AIN0)	PH3 (OC4A)
D7	PD7 (PCINT23/AIN1)	PB3 (PCINT11/OC0A/AIN1)	PH4 (OC4B)
D8	PB0 (PCINT0/CLKO/ICP1)	PD6 (PCINT30/OC2B/ICP)	PH5 (OC4C)
D9	PB1 (OC1A/PCINT1)	PD5 (PCINT29/OC1A)	PH6 (OC2B)
D10	PB2 (SS/OC1B/PCINT2)	PB4 (PCINT12/OC0B/SS)	PB4 (OC2A/PCINT4)
D11	PB3 (MOSI/OC2A/PCINT3)	PB5 (PCINT13/ICP3/MOSI)	PB5 (OC1A/PCINT5)
D12	PB4 (MISO/PCINT4)	PB6 (PCINT14/OC3A/MISO)	PB6 (OC1B/PCINT6)
D13	PB5 (SCK/PCINT5)	PB7 (PCINT15/OC3B/SCK)	PB7 (OC0A/PCINT7)
D14	-	PC7 (TOSC2/PCINT23)	PJ1 (TXD3/PCINT10)
D15	-	PC6 (TOSC1/PCINT22)	PJ0 (RXD3/PCINT9)
D16	-	PC5 (TDI/PCINT21)	PH1 (TXD2)
D17	-	PC4 (TDO/PCINT20)	PH0 (RXD2)
D18	-	PC3 (TMS/PCINT19)	PD3 (TXD1/INT3)
D19	-	PC2 (TCK/PCINT18)	PD2 (RXD1/INT2)
D20	-	PC1 (SDA/PCINT17)	PD1 (SDA/INT1)
D21	-	PC0 (SCL/PCINT16)	PD0 (SCL/INT0)
D22	-	PD4 (PCINT28/XCK1/OC1B)
D23	-	PD7 (OC2A/PCINT31)
A0	PC0 (ADC0/PCINT8)	PA1 (ADC1/PCINT1)	PF0 (ADC0)
A1	PC1 (ADC1/PCINT9)	PA0 (ADC0/PCINT0)	PF1 (ADC1)
A2	PC2 (ADC2/PCINT10)	PA2 (ADC2/PCINT2)	PF2 (ADC2)
A3	PC3 (ADC3/PCINT11)	PA3 (ADC3/PCINT3)	PF3 (ADC3)
A4	PC4 (ADC4/PCINT12)	PA4 (ADC4/PCINT4)	PF4 (ADC4/TCK)
A5	PC5 (ADC5/PCINT13)	PA5 (ADC5/PCINT5)	PF5 (ADC5/TMS)
A6	PC6 (ADC6/PCINT14)	PA6 (ADC6/PCINT6)	PF6 (ADC6/TDO)
A7	PC7 (ADC7/PCINT15)	PA7 (ADC7/PCINT7)	PF7 (ADC7/TDI)