How to create a USB Humidity and Temperature sensor?

Question

One teacher at my school assigned to me to create and USB Humidity and Temperature sensor. I have to use an analog or digital sensor connected via USB to the computer and show the relative humidity an temperature data on a C++ or C# program...

Answer 1

This is quite a complicated project for high school.

You can buy one, as indicated by the other poster. You won't learn much, but it will work. Interfacing with other computers is also a difficult task; the software that does this in Windows is called a device driver. Maybe making the interface will be enough work to satisfy your teacher. They other poster's source has pre-programmed microcontrollers if you insist on going ahead that will very considerably reduce your work.

USB is complicated interface, your sensor needs to have a computer to communicate with the PC. Building such a device by yourself is tough. You need a microcontroller, then to make a program for it, then program the microcontroller, then write a driver for the USB device. Not a job for mortals!

A more reasonable project would be to do a temp sensor only on a parallel port. A single chip (tied to a sensor) with a parallel BCD output could be attached to the parallel port. Google parallel port to see how to interface to it. It is easily read using simple commands.

Another solution is to use a DMM (digital multimeter). Our school has several with RS-232 (serial port) interface that can be used in science projects.

Answer 2

Found a link for this very thing.