I've just finished a data logging project that consists of:
- Arduino Uno R3
- DHT11 Temp and Humidity sensor
- Date and time module
- Sharp IR sensor
- Light sensor
- SD Shield
- 20x4 LCD Screen
All seems to be fine using my 9v dc adapter, but when I try hooking up to a 9v pp3 the whole system pretty much dies. I've even put a switch on the LED backlight to turn it off when not needed, but doesn't make much of a difference at the moment as the whole thing doesn't seem to start as mentioned before.
I need this part of my project to have a power span of about 4 hours and was wondering if I have any options.