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Topic: Leonardo Clone out already! (Read 49722 times) previous topic - next topic

CrossRoads

Saw this in the Spanish Forum

http://arduino.cc/forum/index.php/topic,78600.0/topicseen.html

homemade board with ATmega32U4, uses built in USB interface

http://txapuzas.blogspot.com/2009/12/paperduino-leonardo-clon-de-arduino.html
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

cyclegadget


  I for one am excited! Looking at the datasheet it seems that chip pins 10 and 11 are for the USB communication. They say (PDI/PCINT2/MOSI) PB2.....PDO/PCINT3/MISO) PB3.

Newark price/ eagle file / and datasheet:
http://www.newark.com/atmel/atmega32u4-au/ic-8bit-mcu-megaavr-16mhz-tqfp/dp/26R5633?Ntt=ATmega32U4

Features
• High Performance, Low Power AVR® 8-Bit Microcontroller
• Advanced RISC Architecture
- 135 Powerful Instructions - Most Single Clock Cycle Execution
- 32 x 8 General Purpose Working Registers
- Fully Static Operation
- Up to 16 MIPS Throughput at 16 MHz
- On-Chip 2-cycle Multiplier
• Non-volatile Program and Data Memories
- 16/32K Bytes of In-System Self-Programmable Flash (ATmega16U4/ATmega32U4)
- 1.25/2.5K Bytes Internal SRAM (ATmega16U4/ATmega32U4)
- 512Bytes/1K Bytes Internal EEPROM (ATmega16U4/ATmega32U4)
- Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
- Data retention: 20 years at 85°C/ 100 years at 25°C(1)
- Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program
True Read-While-Write Operation
All supplied parts are preprogramed with a default USB bootloader
- 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
• USB 2.0 Full-speed/Low Speed Device Module with Interrupt on Transfer Completion
- Complies fully with Universal Serial Bus Specification Rev 2.0
- Supports data transfer rates up to 12 Mbit/s and 1.5 Mbit/s
- Endpoint 0 for Control Transfers: up to 64-bytes
- 6 Programmable Endpoints with IN or Out Directions and with Bulk, Interrupt or
Isochronous Transfers
- Configurable Endpoints size up to 256 bytes in double bank mode
- Fully independent 832 bytes USB DPRAM for endpoint memory allocation
- Suspend/Resume Interrupts
- CPU Reset possible on USB Bus Reset detection
- 48 MHz from PLL for Full-speed Bus Operation
- USB Bus Connection/Disconnection on Microcontroller Request
- Crystal-less operation for Low Speed mode
• Peripheral Features
- On-chip PLL for USB and High Speed Timer: 32 up to 96 MHz operation
- One 8-bit Timer/Counter with Separate Prescaler and Compare Mode
- Two 16-bit Timer/Counter with Separate Prescaler, Compare- and Capture Mode
- One 10-bit High-Speed Timer/Counter with PLL (64 MHz) and Compare Mode
- Four 8-bit PWM Channels
- Four PWM Channels with Programmable Resolution from 2 to 16 Bits
- Six PWM Channels for High Speed Operation, with Programmable Resolution from
2 to 11 Bits
- Output Compare Modulator
- 12-channels, 10-bit ADC (features Differential Channels with Programmable Gain)
- Programmable Serial USART with Hardware Flow Control
- Master/Slave SPI Serial Interface
- Byte Oriented 2-wire Serial Interface
- Programmable Watchdog Timer with Separate On-chip Oscillator
- On-chip Analog Comparator
- Interrupt and Wake-up on Pin Change
- On-chip Temperature Sensor
• Special Microcontroller Features
- Power-on Reset and Programmable Brown-out Detection
- Internal 8 MHz Calibrated Oscillator
- Internal clock prescaler & On-the-fly Clock Switching (Int RC / Ext Osc)
- External and Internal Interrupt Sources
- Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby
• I/O and Packages
- All I/O combine CMOS outputs and LVTTL inputs
- 26 Programmable I/O Lines
- 44-lead TQFP Package, 10x10mm
- 44-lead QFN Package, 7x7mm
• Operating Voltages
- 2.7 - 5.5V
• Operating temperature
- Industrial (-40°C to +85°C)
• Maximum Frequency
- 8 MHz at 2.7V - Industrial range
- 16 MHz at 4.5V - Industrial range
Good links: Eagle tutorial= http://www.youtube.com/playlist?list=PLDE1858BD83D19C70
General Arduion tutorials = http://tronixstuff.wordpress.com
http://www.gammon.com.au/forum/bbshowpost.php?bbtopic_id=123

CrossRoads

More discussion on the Spanish thread shows this too:

http://ladyada.net/products/atmega32u4breakout/

with links to software for the USB stuff.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

CrossRoads

Atmel summary datasheet
http://www.atmel.com/dyn/resources/prod_documents/7766S.pdf
& other interesting info
http://www.atmel.com/dyn/products/product_docs.asp?category_id=163&family_id=607&subfamily_id=760&part_id=4317
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

CrossRoads

How about an Uno-like version using the ATMega32U4 chip like Leonardo/Teensduino?

I think I have this one pretty far along. Still thinking how to bring the 6 extra IO pins out.

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

frank26080115

Uno-like? You mean physically? Have you seen

http://code.google.com/p/micropendous/


CrossRoads

Yes, physically, fully shield compatile.
Had not seen Micropendous, looks similar but uses the AT90USB1287 instead and adds a few more features like I did with my ATMega 1284 Bobuino.
No end of variety out there!
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

cyclegadget


  I was wondering how long it would take you to make your own board CrossRoads! As far as the extra I/O pins, I think they could be put on the end similar to the Mega. I think you just about have to, in order to make it shield compatible.

Nice work!
Good links: Eagle tutorial= http://www.youtube.com/playlist?list=PLDE1858BD83D19C70
General Arduion tutorials = http://tronixstuff.wordpress.com
http://www.gammon.com.au/forum/bbshowpost.php?bbtopic_id=123

CrossRoads

I think it's done...
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

cyclegadget


  I honestly I don't need anymore boards but, I still would like to build a couple of these. If you are going to have them made I would take 2.
Good links: Eagle tutorial= http://www.youtube.com/playlist?list=PLDE1858BD83D19C70
General Arduion tutorials = http://tronixstuff.wordpress.com
http://www.gammon.com.au/forum/bbshowpost.php?bbtopic_id=123

CrossRoads

Maybe I'll order up 10 bare boards from iteadstudio then! Lets see if anyone else is interested.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

retrolefty


How about an Uno-like version using the ATMega32U4 chip like Leonardo/Teensduino?

I think I have this one pretty far along. Still thinking how to bring the 6 extra IO pins out.




You seem to have both a power select switch or jumper and also a auto-voltage selector/FET. How are both those features going to work together?

Lefty

CrossRoads

Hmm,  let me tweak that a little. Need 5V on the USB power pins to receive D-/D+, that's not arranged qute right.
Want the option to power everything from Vin/external 5V, or power everything from USB, or power everything from Vin/external 5V and keep USB alive while not powering from USB.

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

westfw

Leonard itself isn't out yet, right?  So in theory the pin mapping that it will use isn't known for sure?  (there is a pins_arduino.h file for it in the v1 release candidate distributions.)

I've "always" wanted to put a bigger chip on the standard arduino board, and make the extra pins do duty as extra features (so the upload port would be different that pins 0/1, and the ISP port would be different than 11/12/13, and maybe there would be some extra peripherals on the board that didn't interfere with the standard "pins."  Sorta like the extra LED on ChipKit.)

frank26080115

#14
Nov 14, 2011, 07:02 am Last Edit: Nov 14, 2011, 07:04 am by frank26080115 Reason: 1
err... where's the 3.3V supply?

I highly recommend running the entire circuit at 3.3V instead of 5, honestly, how many 5V devices are being used vs how many 3.3V devices there are?

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