Picture show you have both input connected to same place (ref. diode), resistor divider left unconnected.Originally Posted by lerameur
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Picture show you have both input connected to same place (ref. diode), resistor divider left unconnected.
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I got it going somehow. I dont even know what I was doing wrong...
maybe I am still sleeping
k
Last edited by lerameur; - 29th January 2007 at 17:18.
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Ok I think I know where lies the confusion.
Ihave two batteries I want to check.I can check the battery that powers the microcontroller with voltage reference. I am trying to check the second battery . There is no common ground and I dont want one because of the isolation I want to have. Therefore I think when I do an A/D, is reads as a floating value.
How do I go around this ?
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lerameur, Why not just read the total voltage of the series connection and then the lower cell voltage. Then subtract the lower voltage from the total voltage to get the upper cell voltage? That way you only have 1 ground connection.
Dave Purola,
N8NTA
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the batteries are not in series. One 12v battery for the controller, and a 24v (well 2 12v battery in series) for the motors. That is if I understood you correctly
k
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lerameur, After my reply I re-read the post and understood the grounds are not common. Is this true? Why can't you common the grounds?
Dave Purola,
N8NTA
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I want to isolate the circuit . There was too much harmonics on the ground, it was killing the microcontroller.
what about an opto coupler ?
I am also looking some amplifier , any thoughts on this one: ISO124
Last edited by lerameur; - 30th January 2007 at 22:42.
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