User manual

to use virtually any power supply adapter on the market, including applications with the standard

24VDC industrial power supply.

3. We carefully selected all components to work reliably over the industrial temperature range

-25+85C so the board can be used in industrial applications (the original design was suitable for the

commercial 0-70C operating temperature).

4. The original Arduino design was not good for portable applications as it dissipated too much

power in the linear voltage regulators. We chose ULTRA LOW POWER voltage regulators with

consumption of only few microamps to enable handheld and battery powered applications.

5. We added a Li-Ion rechargeable battery power supply option with a BUILT-IN onboard charger,

so when a battery is attached it is automatically kept charged . When the other power source (USB

or external adapter) is removed it will AUTOMATICALLY power the board - no jumpers, no

switches!

6. Our design can work both on 3.3V and on 5V, switch-selectable.

7. Our boards included the UEXT connector, allowing many existing modules like RF, ZIGBEE,

GSM, and GPS to be connected. It also saves soldering to interface I2C, UART and/or SPI.

8. Our design allows a Real Time Clock (RTC).

9. We made our design noise immune in the RESET circuit. There are a number of threads on the

Arduino forum for problems with the RESET when the board works with motors, since Atmel

recommendations were omitted in the original design. We fixed this.

10. We used a separate voltage regulator for the Analog part, allowing the ADC to be read correctly

without digital noise pickup.

11. We made provision for the optional ARef precision voltage source, for users who need higher

precision and temperature stability in Analog readings.

12. We placed the LEDs and the BUTTONs on the edge of the board for easy access even if the

boards have shields on them.

13. All components were placed LOWER than the connectors, so the shields do not interfere with

them.

14. We used a mini USB connector which is common and used in most cell phones, so you do not

have to buy other cables.

15. The original design did not space the connectors at 0.1", making perfboard use impossible. For

compatibility, we used the same spacing but we added footprints next to the connectors on 0.1"

which customers can use with perforated boards.

16. All signals on the connectors are printed on top and on bottom of the board, so when you check

with a probe you know exactly which point you are measuring.

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