I'm need to have the circuitry run over the coin cell power till it isn't supplied with power from the external source like usb or another power source when the circuitry is provided with the external power then the circuit should run over it, I encountered for power path ic's but many are too complex with many other functions that are more suited to be used in ac power adapters and are costly too.
The Arduino already has such a feature on board (it automatically switches between external power and USB power). Without special power saving programming you won't power an Arduino long with a coin cell. Did you think about that?
Without special power saving programming you won't power an Arduino long with a coin cell. Did you think about that?
offcourse , with all those unecessary items like the vregs in arduino it never going to last on a coin cell a special regime to shutdown unwanted perpherals on the chip need to be done and sleeping and wake on ext. interrupt needs to be configured im all prepared for that .
The Arduino already has such a feature on board (it automatically switches between external power and USB power)
AS you can infer for the nature of my imlication IM not using a full flegded arduino and never have! I always build by circuit based on the minimalist circuit to achieve the feat at hand so understand the fact that chip is on its own!
NI$HANT:
As you can infer for the nature of my implication I'm not using a full fledged Arduino and never have! I always build by circuit based on the minimalist circuit to achieve the feat at hand so understand the fact that chip is on its own!
Bully for you. The point is that the power changeover circuit in the Arduino - available in the schematic to the various versions - would be your first and most obvious example to copy.
AS you can infer for the nature of my imlication IM not using a full flegded arduino and never have! I always build by circuit based on the minimalist circuit to achieve the feat at hand so understand the fact that chip is on its own!
Why don't you write that in your post then? You want some help from us so you have to provide all necessary information to us and don't let us guess. If you don't write anything in the post, we're expecting you to use an Arduino UNO as that's the most common type in use.