Cytron Technical Forum

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.

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.

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?

You can have a look at this waterproof version.

sich WROTE: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.

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