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Different result if connecting 9V?

Former Member

I have done the project in Jeremy Blum "Explorign Arduino" related to the three color LED changing with the temperature. It works right when connected with USB, but it is always red if connected to 9V.

Did I do anything wrong? is it normal? how can I solve it?

The sensor is a TMP-36image

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  • Hi Jose,

    Your hookup looks good. As Brian has pointed out there is no reason why it will not work if the power source is solid and hooked to the DC input jack or to the Ground and Vin terminals of the Arduino header. I would also put a 0.1 uF cap across the 9 Volts near the Arduino. That book by Jeremy is excellent and I had a lot of fun working through it a while back.

    John

  • in reply to jw0752

    Thank you for the answer. I have checked with another board with a LCD and a DTH 11 sensor and the difference is 2 degrees centigrade between USB and 9v. What I can't understand is why. I thought the board provided 5v when connected to either 9V or USB.  I have checked the battery and it is providing 6.54v.

     

    imageimage

  • in reply to Former Member

    Sensors are very dependant on the voltage provided. Change the voltage, they need to be recalibrated. Try a separate independent power source on the rail to the sensor that is 5V. repeat the experiment and report back the results.

    Clem

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