I am trying to find a way to change the reference voltage for A/D so that I will be able to get better resolution from 3 axis accelerometer, which outputs 1.33v ~ 1.99v each axis.
I was reading Basic Atom (not pro) manual and I noticed that it had the capability of setting AX3 pin as a voltage reference pin by using the parameter AD_RPOS... But I don't think BAP28 (Basic Atom Pro 28) has that capability because there is absolutely no mention of such feature in BAP28 manual.
I found this
http://forums.basicmicro.net/viewtopic.php?f=486&t=8931&sid=d52c99a731e39aa83550091fbadd1c76
which sugguests a whole lot of nothing.
No Vref? Very disappointed, especially since I could've potentially doubled up the resolution of the sensor, which is a big deal!
I thought of a possible solution... I could build an amplifying circuit using Op-Amp, and just boost the 3 analog signal coming from the accelerometer... I'll leave this option as my last resort. I will probably just go with what I have now and see if I have any stability issue with auto-balancing.
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