hello guys, i'm new here.

i'm totally lost on the school project which is a light and temperature control project. The project requires using light and temperature sensor to detect the light and temperature in a closeable environment(a box).

So that when the temperature is higher than 20 degrees for example, the fan will be start by a small dc motor to cool down the temperature;
and as the light control part, light sensor will active the motor to close the shutter when it detect any light in the environment.
this project will also include a MCU.

As you guys are very experienced people, just throw your 2 cents here, whatever you say will be really helpful. thank you very much.

 

first cent - u need a temp sensor eg:lm35 which gives an o/p of 10mv/C
second cent - u need a light sensor ed: an LDR , which varies its resistance wrt light.
for a micro i recommend a PIC pref 16f628a .
for motor i recommend a stepper .
now think a little to how to use these things

 

My suggestions are:

For temperature AD22100ST (-50°C to +150°C). It ahs a ratiometric output so you don't need any precise voltage reference for the ADC behind it. Free samples here: http://www.analog.com/en/prod/0%2C28...2100%2C00.html

Why not using a PSoC instead of standard MCU. It has analogue blocks, digital blocks and MCU in one chip. All about PSoC here: http://www.cypress.com/portal/server...&showall=false
Lots af applications notes available. See AN2020 for complete temperature control including RTD and fan control. First part of your project is done :lol:

Second part light control: up to you to search the right AN... ...

Good luck...