I have an Arduino project which measures surface temperatures with an Melexis IR sensor, the air temperature and the humidity. All parameters are measured continuously and the average of an 5min intervall is written down on an micro sd card with a timestamp from an RTC. You can see the setup on the picture. The datas will be read out two or three times a week via the USB connection and processing. The arduino itself will be power via the external power input. And here is my question: The power retrieves the power form an Campell Scientific CR1000 logger with an output of 12v. Is it nessessary the downsize the voltage to 7v to prevent overheating? (The Arduino is places in a small waterproof box). If yes, can I simply solder an converter like this one to the cable or should it be on a circuit board?
Thanks a lot banff