I connected to it with Vin. I said i tried out with another program!! from that itself you can infer that the battery connection is ok. anyway i connected a band new 9v battery. i also tried with direct method (12v dc adapter).
when i remove USB (after upload), and connect with external source, nothing happens. when i reconnect with USB, nothing happens. the board gets power.thats the only thing that happens..
while testing with other program, everything works normal with USB, 9v supply, 12v adapter etc. But t=for SIMPLE TIMER program, it is not. May be it has a new library and the fact that i have to include a new line" #include<SimpleTimer.h> .?????
NOTE : For TESTING purpose, i checked the code with LED blink. Instead of water delivery , i used onboard LED. (no problem with onboard LED).
the code is the problem here.. NOT the external source, what it is, how it is, how much it has it can, etc...