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From Seeed_Studios
1. Duplicate digital IO to 100mil grid for prototype board compatibility.
Adding an second row of header align to standard 100mil grid, so it will be compatible both to existing shield and to a cheap 100mil grid prototype board. By default, the traditional IO is soldered instead or new headers, and you may add the new header yourself.
2. Shrink componets height below female headers.
Seeeduino is made as flat as possible, even the crystals are SMD version. So we may put your soldered prototype board onto it with less worry.
3. Easier access to buttons and switches.
All buttons or switches are moved nearer to the edges, so we may reach them easier under the shield or from the wire forests.
4. Change Type-B USB port to Mini USB.
Consideration for dimensions.
5. Replace 3.5mm DC power Jack to battery 2 Pin plug.
Soldering the 3.5mm DC power jack is usually the most difficult part, and we think it's too giant. Maybe a battery pack is more convenient than power adapters? Don't worry about abandoning your 12V adapter, we have a simple converter.
6. Reset and power indicator near RST button.
We use one LED for power indicator and the other for reset (it will also lid when downloading programs).
7. Auto-reset selection.
Auto-reset is a great feature loved by many. But sometimes we would also like to disable it in production-like mode.
8. 3.3V Operating Voltage selection.
The Vcc could be selected by a switch, for making life easier dealing 3.3v devices.
9. Pin out UART for FTDI232 bit-bang operation.
At least you can burn bootloader without an ISP cable now (Plz refer to Kimio's detail tutor: http://www.geocities.jp/arduino_diecimila/bootloader/index_en.html)
10. Pin out 2 extra ADC.
Why not? There are spaces :)
11. Pin out for I2C and sensors.
Easier connection to I2C and sensors by a bended femail header.
12. Optional capacitor for improving 3.3V output performance.
This is just another trial, we found in the FTDI manual about the capacitor used for improve 3.3v output performance. Although many Arduino, Freeduino, and other -duinos have proven it's just optional, we deciede to keep an option to check the difference.
13. ReRoute PCB
SMD version Atmega168 give us more space to route, so we carefully rearranged them for us to see the flow more clearly. |
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