Hello Everyone, Sorry for taking so long to answer. But here are my comments:
* I noticed the error on the first readings when using the external channels (A0 and A1). It happens on both tmote invent that I have access to. I am using the tmote's own sensors (accelerometer), and I've done no hardware modifications. * When I used the Msp430InternalVoltageC the first reading was OK. * I believe on Michael's hypothesis, which is that the sampling time of the sample and hold is not correctly set on the first run. The ADC counts I get are like if there was not enough time to charge the capacitor, they are proportional to the input voltage, but much smaller. ~Dimas~ > On Thu, Jun 19, 2008 at 8:45 AM, Jan Hauer <[EMAIL PROTECTED]> wrote: > What ADC channel are you using, external (A0-A7) or internal (>7)? > does the conversion require stable reference voltage (if so, is your > application wiring to AdcReadClientC or Msp430Adc12ClientAutoRVGC()?). > Do you see the same result when you use > tinyos-2.x/tos/chips/msp430/sensors/Msp430InternalVoltageC? > > Jan >
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