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Temperature Sensor
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Contents |
Introduction
I wanted a reliable way to measure temperature with the bug device,
so I went to the electronic shop and asked if they had i2c sensors,but they didn't have one.
So at the end I bought a 2 Euros LM35 and at the end it worked quite easily
Pictures,wiring etc..
Warning
- Be careful at what they say in the datasheet,in page 2 at the "TO-92 Plastic Package" they said bottom view,so do not think it's top view like I did at first,if you mistakenly invert the pins it heats really a lot and the maesurement are not correct..
"Circuit"/wiring
There are different ways to wire it:
- using short wires(easier)
- Making a circuit
- using long wires.
If you use long wires you will need additional resistors,and to wire them as described in the LM35 datasheet. Thanks willis in #buglabs irc channel for pointing it to me(I had wrong values because I used long wires without additional resistors).
Short wires
- connect the +Vs to the 5v
The connection to the ADC will depend on your program but if you use VonHippelAnalogDemo you could use the following wiring:
- connect the ground to the ADC ground
- connect the Vout to the ADC pin like pin 0 to 4
Circuit
The circuit has the shortest wires,but because it's close to the bugbase it has the following inconvenients:
- could capture bugbase's heat(bad)
- tied to vonhippel
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How to interpret the results
Just multiply the voltage by 100,that is to say:
0.2147xxxxxV is 21,47 degrees C
The datasheet,for the most simple wiring(that I used) says that it outputs 10mv for a degree,linearly
Applications
- The EMF logger application can be reused as-is,but the voltages displayed are a bit too much precise(too much decimals)
- The vonHippelAnalogDemo is great for testing or if you need a GUI
