Hello John, I put the LED in series like you suggested and it was indeed blinking, so re hooked up the Nixie Tube and it started working fine!
Now that I have one Colon going can I drive another Colon of the same Transistor? or do I need to use another Transistor? I guess i'm asking which is the best way to do it. Cheers Rob. On Thursday, November 1, 2012 12:05:26 PM UTC+8, randyrob wrote: > > > > On Thursday, November 1, 2012 11:56:39 AM UTC+8, jrehwin wrote: >> >> > I would like to make the Microcontroller flash the colon's in between >> the Hour and Minute Numbers. >> > (I will be later on using this for Temperature trends - fast flashing >> for warming up and slow flahsing for cooling down) >> > >> > anyway I got some MPSA42's of the 'bay and wired them as following ==> >> > >> > http://www.halfluck.com/source/nixie/MPSA42.jpg >> > >> > Then uploaded the simple blink sketch to the Microcontroller. >> > >> > The issue I'm having is the Colon's just stay lit, they don;t actually >> blink. >> >> You may have a weak pull-up enabled on your microcontroller, which leaves >> the transistor on enough >> to light the colon. If your microcontroller is an Arduino and you're >> using pin 13, the LED on the Arduino >> could be pulling your transistor on too. >> >> I'd suggest trying a different I/O pin. Another thing you can do if you >> have an LED lying around is to >> replace your 33k resistor with a 1k to 10k resistor and put your LED in >> series. That way, the LED >> should light when you're turning the transistor on. If you see the LED >> flashing, that means you're >> sending current into the transistor. If the colon still stays on, try >> adding a resistor from the transistor >> base to ground to absorb stray current. >> >> Other things you might want to investigate: does the colon stay on if you >> power off the microcontroller? >> If not, it means your transistor is okay, but your microcontroller isn't >> turning that I/O pin off enough. >> How about if you disconnect it from the transistor? If it still stays >> on, you may have a bad or misconnected >> transistor. >> >> - John >> > > Hello John, > > Fantastic Advice - Many Thanks. > > Yes it is an Arduino. I have it on Digital Pin 10 & had 13 Blinking too so > I could see what was going on. > That definitely gives me some ideas to work with. I will try all of your > recommendations and report back. > > Cheers Rob. > > > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/ceI3RtqDGI0J. For more options, visit https://groups.google.com/groups/opt_out.
