Hi Shane,
I think that your problem is most likely one of two things:
1) Something is wrong with your output routine for pin 4. Different
microcontrollers will have different pin setups. Read through the manual
very carefully on the new microcontroller on the subjects of setting up pins
for output. Just because the same routine worked on pins 1-3 doesn't
necessarily mean it will work on pin 4, all I/O pins on a microcontroller
are not equal.
2) Possibly your 74141 has failed. They sometimes do that, although I don't
know I've ever heard of one failing like that one. Still, if you have a
spare to swap in, might be worth giving a try.
-Adam
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On Sat, Aug 21, 2010 at 2:35 PM, mimewar <mimewar@...> wrote:
I had a working one tube counter, a simple 0-9. I was using the Basic Stamp
board. I moved to a Picaxe 08M, and now, it won't count past 7. I goes
0,1,2,3,4,5,6,7, dark, dark, 0,1,2,3,4...
Anyone have any experience with the 74141 TTL chips and microcontrollers?
Did I leave something tiny, but important out? I have the four output pins
of the 08M, going directly to the 1,8,2,4 inputs of the 74141 ( and yes I
made sure about 12 times that the outs and ins all correspond.. No caps, no
resistors except on the HV input on the tube..
I looked at it enough so I know that 8, and 9 are the only two digits that
involve pin 4 (binary input 8) going high. I have tested this on three
different microcontrollers, and still nothing. Anyone have any TTL
experience that may have a suggestion?
