Hello,
Something that I thought would be simple, Is just getting harder!
I can't for the life of me get the interfacing circuit to function. It's not complicated, I just cant get it to work....
I'm basically doing the same as this:
**broken link removed**
but Am using a 5v source instead of 12v.
The Usb to serial adapter I'm using creates a -7v to + 7v swing, and on its own, functions as I would expect using the Software app by Ron.
However, when I try and use the interface, I'm getting 1.7v out of DTR pin (when set high, 0v low), and nothing at the base of the Transistor (I'm using a BFY51, simply as it was to hand, and I don't need anything fancy).
The only difference between the schematic and my Stripboard layout is that I'm using 1n4001 diodes (again to hand, and shouldn't make any real significant differences)
I don't get it..... its not hard!!
Any Ideas??
Cheers,
Owen.