Hello, I'm a chemist and know next to nothing about programming and circuit building. I just bought the UNO along with a Hall Effect sensor, photoresistor, and a temp sensor to try and learn a bit more
I was excited when I got the board, and copy and pasted in the Blink LED code to see if it worked, which it did.
I then followed this tutorial http://www.ladyada.net/learn/sensors/tmp36.html
and set up the simple temperature sensor circuit. I changed the power to 3.3V instead of 5, and changed that in the code...but I'm getting huge fluctuations in the temperature and was wondering if the code is bad...or more likely my temp sensor is bad? Would a resistor somewhere in the circuit cut out noise in the power supply?
Here is what im getting back in the serial port monitor:
216.96 degress F 1.83 volts 133.05 degress C 271.48 degress F 1.50 volts 99.85 degress C 211.74 degress F 1.29 volts 78.91 degress C 174.03 degress F 1.46 volts 95.66 degress C 204.20 degress F 1.98 volts 147.55 degress C 297.59 degress F 1.62 volts 112.10 degress C 233.78 degress F 1.48 volts 97.92 degress C 208.26 degress F
ALso, how do you make the board STOP running something? I've tried hitting the reset button and also the stop button on the arduino software...but it keeps going as soon as i let go of the reset button. I have to manually unplug the power cable which is a little annoying. Thanks for the help!!!