Hello everybody, I am quite new in all this electronics and circuits stuff, but I have to deal with it somehow, as I need some basics for a studies related project. Unfortunately I do not have a clue, so hopefully I can bother you with some of my questions ... My current task is to find a circuit design for measuring skin temperature. I already developed some ideas on that, but I am not sure, if I am doing right. So this is, what I want to achieve: What temp range? "normal" skin-temperature is 32/33°C; Temperature Range in certain conditions can be between 31°C and 37°C So range 31°C - 37°C is required. Accuracy? Different medical devices use different values here. I think for me ±0.1°C is ok. Response time? Seconds should be ok. Distance? direct skin contact - some mms Output? analog Other requirements? - Sensor should be as small as possible (plan is to built the sensor into a mobile phone) - Sensor should work with +5V Do you recommend any sensor-device for this application? I thought about the LM35 (http://www.national.com/mpf/LM/LM35.html). Is this a good choice? Or can you recommend anything better, smaller, ...? Further, I have this circuit diagram - which I am not sure is a good one (see attached file skintemperature.jpg) Would be happy for any help with this circuit diagram (as I do not know, if this could work for me): does this circuit diagram make any sense for what I want to achieve? Sorry, this sounds like a stupid question, but this is the first time that I try to design such stuff ... Thank you very very much for all of your efforts in advance. Hope to get some answers here, that might help me.