Hi,everyone!
I got my Tiny2.11 bundle from PPZUAV,unfortunately with three faulty
ir_sensors.I found out later it was because they'd been soldered with
broken AD8551.I replaced the AD and fixed the sensors.
Then I found the ADC_0 was not working at all.When I connected the
vertical sensors to IR_V,the message window showed 0 and never
changed,but a voltage around 1.625 could be measured from both ADC_0
and pin 1 on LPC2148,changing with temperature.I tried IR_V on
ADC_5,with sensors covered in foam and neutral set to 0,the message
reading was 484.Then I changed the neutral to 484,but the reading was
not 0 but 241,no way to get a 0. When tested with ADC_3,with neutral
set to 0 I got -772,but I got around 0 only when neutral was set to
512,couldn't explain why.I tested with ADC_6 and ADC_4 too,got
readings about -136 and -768.I have no idea why the result were like
this,everything seemed to be OK before they went into LPC2148,but the
output were wrong.
I did another test,unpluged everything and checked the readings.The
results were:ADC_0,ADC_5,ADC_6----0,with a voltage of
0V;ADC_1,ADC_2,ADC_3.ADC_4-----varied from 50 to 700,with a voltage
varied from 0.1V~0.6v.I don't why there were still readings and even
voltages on pin when nothing went in.
Another thing,the LPC2148 got somehow hot when running for a few
minutes,was that normal?
Needs help with the strange results of the ADC.Since PPZUAV won't ship
to China,I can't sent it back for replacement.I have to fixed it myself.
Thanks!
Regards,
TL
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