LM35 temperature sensor with 3.3v Arduino Fio

[leexin89]

Hi there,

I'm building a project using Arduino Fio that runs on 3.3v, but from what I understand LM35 sensors need 4v or more to operate (no problems for those 5v Arduino boards).

So back to the question, can I use the LM35 sensor with Arduino Fio? Is it safe, and if it is, can it produce accurate temp readings?

Cheers.

[ober]

Yup, you are right, minimum operating voltage for LM35 is 4V according to datasheet. Yes, It might still work under 3.3V, but accuracy will be affected.

[leexin89]

Thanks for the reply.

I have another question.. is LM35 sensor suitable for outdoor usage? I don’t think it will give an accurate environmental temperature reading if housed within a waterproof case right? If so, what other temperature sensor modules would you recommend to go with a 3.3v Arduino Fio?

[sich]

You can have a look at this waterproof version.

[leexin89]

You can have a look at this waterproof version.

Hmm I'm having a hard time understanding how to get data from the waterproof temperature sensor.. Do you have any sample code in Arduino?

Thanks.

[ober]

Yup, if you check the product page of DS18B20, there are tutorial links and one of it is Arduino Example