Multiple Power Supplies?
Eschatt
Posts: 16
Hi,
I have been working on a circuit for the past couple weeks. The result of the comparator is a no voltage in one state and about 7 volts in an other state. The comparator has a separate power source from the BS2. I am relatively new to the basic stamp... when I attach the out put of the comparator to an i/o pin why can't the BS2 tell the difference between the two states (the value goes between 1 and 0)? The BS2 works well with its own power supply, telling between positive and negative. Thanks in advance.
-Eschatt
I have been working on a circuit for the past couple weeks. The result of the comparator is a no voltage in one state and about 7 volts in an other state. The comparator has a separate power source from the BS2. I am relatively new to the basic stamp... when I attach the out put of the comparator to an i/o pin why can't the BS2 tell the difference between the two states (the value goes between 1 and 0)? The BS2 works well with its own power supply, telling between positive and negative. Thanks in advance.
-Eschatt
Comments
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- Stephen
I would start with at least a 220ohm series resister and a 5.1 volt zener.The stamp has built in protection, But I don't like to depend on it alone.
Your binary value of "0" or "1" has a set voltage.If Your using a CMOS device (comparator)this value could be 7 volts for a logic level of "0" or "1" this is 2 volts to many for a TTL device like the BS2
What I'm tiring to say is theirs more to logic than just "0" and "1" .Especially when working with different voltages
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-Eschatt