ATMEGA32 programing for HIH4000-003 & LM35

The sensors are just inputs to the chip.
the mega32 has loads of inputs/outputs (32) and it's really easy to use.
All you need to figure out is what sort of output your sensors give...

I'm new to microprocessor programming too and my first one was an Atmega32 (I started using them just 2 weeks ago). I don't know much about interrupts etc right now, but you should start off by reading the datasheet's section on pinouts and registers.

You have a programmer right ?

 

i would reccomend you use IC DS18S20 as your temperatur sensor and maxim HC-700 as your humidity sensor

the ds18s20 has a built in adc converter , and ready made data pins which is specially designed for a micro-device , so it interfaces quite easily .

To make life easier try using a standard generic 8051 , since all code is readily available , for example there is a standard code to interface an lcd for your sensor display , so you dont have to search or think of a code for a different controller