I'm currently doing an autonomous power supply for a small project with an Arduino PRO 5V 16Mhz and sensors. I'm doing it with a solar pannel (10W), a "home made" charge regulator, and a 12V lead acid battery. My charge circuit is quite done.
The Arduino PRO works almost as the Arduino UNO. http://arduino.cc/en/Main/ArduinoBoardPro
My issue : as every battery, when fully charged, a lead acid haven't 12V, but almost 13.8V.
Apparently the voltage regulation is done from a MIC5205 controller. And the Arduino website advises an input voltage between 5 & 12V.
So, do you think that I should use a regulator before my micro-controller, as a LM7808 for a proper 8V ?
Or can I add, and that for the protection also a diode to protect my battery, and the Vdrop will be 0.7V isn't it ?
Thank you for your help !!!