Hello, I hacked an off-the-shelf blood pressure monitor device that runs on 6V (4 AAA batteries) and connected it to an Arduino UNO R3 to have a program control the device. It is working but I'm having power problems. I have the positive and negative lines from the device connected to the UNO's Vin…

Power problems connecting external device to Arduino UNO R3

CrossRoads April 9, 2013, 8:18pm 7

Check the bluetooth datasheet- it may well be a 3.3V only part, and 5V would damage it.

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