I have a question for an "Arduino to go"...so to say :) I want to avoid LiPo cells since they are not that save as simple NiMH cells and more difficult to get.
First choice: Take three NiMH cells in serie and power the Arduino Pro Mini (3.3v) via GND/Raw. There is (I dont know the details)-converter on the Arduino which will make 3.3v from that by cutting off everything which is too much.
Second choice: Take one or two NiMH cells and a extra DC-DC step-up boost converter (OUT:3.3v) and power the Arduino Pro Mini via GND/Vcc.
I know that there more efficient and less efficient boost converter... Which solution tends to be more efficient based on the principle of generating the needed voltage?
Is there any cheap but recommended DC-DC converter which generates 3.3v from one or two NIMh cells?
Thank you very much in advance for any help! Best regards, mcc