Hi
I have an arduino pro mini 5v and a gsm shield that requires 3.7v.
I would like to power the gsm shield directly from the arduino and avoid using a lipo battery.
Can i draw 3.7v from the arduino?
Or should i buy a 3.3v arduino and use a 3.7v powersource to power them both?
Depending on how much current it draws, you might be able to use a 3.7v regulator to get that from the 5v.
Take a look at the docs for the shield though - typically when devices are packaged as a shield, they are meant to work directly with a 5v arduino, and include level shifting and regulator if the thing on the shield operates at a lower voltage./
The 3.7 v. level isn't much higher than the 3.3 v. you want. It might be hard to find a 3.3 v. regulator which only needs 0.4 v. headroom. You would be less likely to run into difficulties if you started with, say, a 6v. supply (batteries?), and then used separate regulators to get 3.3 and 3.7 v. If a circuit has any sudden demands for current, being only slightly safe in terms of power supply headroom could lead to erratic behavior.
I`ve the same question
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I have been looking for a voltage regulator for 3.7v but have so far only found adjustable versions.
Do you know of a 3.7v fixed output voltage regulator?
You may well have to use an adjustable one - why do you need exactly 3.7v?
That's not a very commonly used voltage, so I wouldn't be surprised if you couldn't find fixed regulators for that.
The gsm module is ment to be powered by a lipo 3.7v battery.
As I understand it such a battery will deliver between 4.2v (fully charged) and 3.7v so if I could find a fixed voltage regulator for any voltage in between i guess that would work.