? on using Arduino shield that needs external power with nRF51 DK

[i_am_trying]

Scenario: I want to use an Arduino shield with the nRF51 DK. When attached to an Arduino, the Arduino's barrel jack is plugged into a 12V power supply. The shield takes advantage of the Arduino's voltage regulator so that both the 12V needed for a pump it works with as well as the 5V/3.3V needed by the shield both work. I (stupidly I guess...) tried plugging a 12V power supply on the "external supply" pins of the nRF51 DK. This blew the board out.

QUESTION: is there no voltage regulation between the "external supply" and the circuits on the nRF51 DK?

QUESTION: the shield assumes the Vin pin of the Arduino provides 5V and 12V. Does the equivalent pin (I believe this would be pin 0.0 on the NRF51 DK act identically to the Vin pin of the Arduino (I thought so because the docs state "Arduino Uno compatible" but I could not tell from looking at the board).

Thank you.

[Stian Røed Hafskjold]

No there is no voltage regulator in the "external supply" header. So if you apply 12V on that pin the board will be broken.

The Vin pin on Arduino corresponds to the bottom pin on the p1 header on the nRF51 DK, which is not connected.

So, the nrf51 DK does not handle 12V and do not supply 12V on the Vin pin to the Arduino. I guess you setup would be: USB to the nRF DK to supply 5V to the shield, and then connect 12V to the Vin on the shield.

You can find the schematics for the nRF DK here: www.nordicsemi.com/.../38675

[i_am_trying]

Thank you. Your answer is a good explanation. I upvoted.