Hello,
As mentioned in the application note - Input interface 3V & 5V circuit to MSP430 - (link here), I am trying to use ULN2003 to input interface a 12V circuit to MSP430.
I have tried the circuit as given in the doc.
Where should the "COM" terminal of MSP430 be connected? (not given in the doc)
I have tried these combinations
1) Connecting COM to 3.3V --> output of ULN at 3.3V at 12V input (no change if input is changed)
2) Connecting COM to GND --> output of ULN at 0.8V at 12V input (output 0 if input at 0V)
3) Not connecting COM --> output of ULN at 3.3V at 12V input (no change if input changed)
Has anyone successfully interfaced this way? If not, is there any low cost alternate way?
--Shashank
