DHT 11

Hello,

I am trying to decipher how to code two DHT11's such that the Arduino is comparing data and then operating relays (alarm) when one DHT falls below another.

The alarm will be an audible one for 20 secs or so and a visual (light) which stays on until reset.

The system will not 'arm' for the first couple of minutes after the reset.

I am new to Arduino and am struggling with the number of different sketches and how to interpret them.

Can anyone point me to a "real idiot" guide?

I am not per se interested in the actual values just the fact that a difference exists. Humidity is my ONLY concern to start with - I'll worry about temperature and displaying values later - much later!!!.

Thanks