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Since I am a newcomer in this field,
I anticipate my apologies if the question is too silly! By modifying
tinyos-1.x/apps/Oscilloscope as suggested at http://www.moteiv.com/community/Connecting_External_Sensors
, I tried to convert a 2.9 V analog signal applied to pin 3 of the 10-pin
connector (i.e., the ADC port A0) of a TelosB. I got a reading of ca. 550
instead of something around 4000. Then I measured the input current when the
3-V AVCC voltage (pin 1 of the connector) is applied to pin 3 through a tester.
I got a reading of about 30 mA, which is much larger than what I expected. I obtained the same results considering
the pin 5 (i.e., the ADC port A1) of the connector. Moreover, a tmote sky device gave the
same results. Am I doing something wrong? What can
I do to make A/D converter working with higher input impedance? Thank you in advance for your attention. Sandro Sandro L. Fornili Dipartimento di Tecnologie dell'Informazione Università degli Studi di Milano Via Bramante 65, 26013 Crema (CR), Italy Tel. +39-02-503-30067 Fax +39-02-503-30010 |
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