I am currently making a GPS tracker with UNO and SIM808 (this is the model.
The range of voltage of Lithium battery input power is 3.5 - 4.2V. for the module. I am aware that UNO needs 5V to power.
I want to make it compact as possible so it can be placed within the dashboard of a car or motorcycle.
How do I power both of this using just one battery holder?