0-5V analog data on Fio

Hi there.

I got a fio laying around but no 3.3V sensors. Is it possible to connect these sensors by using a 3.3V zener diode or should I use a simple resistor instead?

The sensors I'm going to use are: http://dx.com/p/mq2-high-sensitivity-gas-smoke-detector-sensor-red-silver-164810 http://dx.com/p/diy-hr-202-humidity-detection-sensor-module-140725 http://dx.com/p/arduino-microphone-sound-detection-sensor-module-red-135533

What is a fio?

Hello Mike.

My apologize, I should have been more clear. Its a little board from Arduino http://arduino.cc/en/Main/ArduinoBoardFio

Thanks, I had not come across that one.

You should always supply the sensors with the voltage they need as given in the data sheet. If that results in there being too much voltage for your arduino then you should cut it down with TWO resistors in a potential divider configuration. A zener and resistor is fine for a digital signal but for an analogue one it will distort the signal at the top end as the zener just starts to conduct.

Thanks Mike. Your knowledge is much apreciated!