If you got it from Walmart you are correct about the time delay, one minute
is as low as you can go. I have an earlier model too that will go down to
20 seconds I think. I have always set my cams up at knee high level and
had good results. The only reason I can think of for few pictures is this
great TX heat we have had. I had to get about five feet from mine the other
day to make it go off. When the air temps are 100 it's hard for it to detect
anything. You should be getting night pics though. Keep trying and good luck.