Search found 24 matches

by sean4star
Sat Nov 02, 2013 11:58 pm
Forum: Nixie thermometer V1
Topic: External sensor mod
Replies: 9
Views: 25064

Re: External sensor mod

Hey all, just getting back to some of my projects after a long hiatus to take care of family and work. I finally put together my external sensor, using the dht22 that I ordered a while back. And what do you know? I'm getting a good temp reading, but the humidity is just plain wrong. After letting th...
by sean4star
Mon Jul 29, 2013 5:54 am
Forum: Assembly instructions for the Thinkgeek nixie thermometer
Topic: Troubleshooting
Replies: 119
Views: 222152

Re: Troubleshooting

If I get the pickit3 do I need to get anything else special to connect to the pcb? Or is it just the pickit and the Mplab software?

Oh, and what can I look up to start learning how to program pic chips? Is there a certain programming language that is used?
by sean4star
Wed Jul 24, 2013 4:38 pm
Forum: Assembly instructions for the Thinkgeek nixie thermometer
Topic: Troubleshooting
Replies: 119
Views: 222152

Re: Troubleshooting

No, I don't...

How much do they run? Do you have any suggestions for model, etc? I've never done any programming or loading programs...is it very complicated?
by sean4star
Fri Jul 19, 2013 3:25 am
Forum: Nixie Chessboard V1
Topic: Just about halfway complete...
Replies: 6
Views: 24045

Re: Just about halfway complete...

Sure. I'm just now getting back to finishing my board. I have 1 and a half rows left, so I will video the last row. Maybe next week when the wife and kids are gone to visit the in-laws.
by sean4star
Fri Jul 19, 2013 2:55 am
Forum: Assembly instructions for the Thinkgeek nixie thermometer
Topic: Troubleshooting
Replies: 119
Views: 222152

Re: Troubleshooting

I touch either line of my multimeter to the two sides of R28. When the nixies are lit the voltage reading is 150mV. If it's just the LEDs or all off then the reading is only 10mV. I guess that's 0.14V to 0.01V. Is this normal? Anything else I should test?
by sean4star
Wed Jul 17, 2013 1:12 pm
Forum: General discussion
Topic: mixed up nixie tubes
Replies: 2
Views: 13949

Re: mixed up nixie tubes

I'm assuming you're talking about the thermometer kit? On the back of the tubes there should be some text in Russian. The symbol tubes are labeled IN-19a and IN-19b. The number tubes are IN-14. If you put them on in the wrong place your thermometer display won't make any sense.
by sean4star
Wed Jul 17, 2013 1:57 am
Forum: Nixie thermometer V1
Topic: External sensor mod
Replies: 9
Views: 25064

Re: External sensor mod

I'm looking at adding an external sensor to see if it fixes the problem I talk about HERE. One quick question:

Is it possible to use a DHT22 instead of a DHT11 for the external sensor? The DHT11 specs show a temp accuracy of +/-2C, which seems pretty lousy to me, vs the DHT22 accuracy of +/-0.5C.
by sean4star
Tue Jul 16, 2013 5:56 am
Forum: Assembly instructions for the Thinkgeek nixie thermometer
Topic: Troubleshooting
Replies: 119
Views: 222152

Re: Troubleshooting

Well I'm at a loss...the SMD definitely is driving the temp. Testing my finger against the chip causes the temp. to start increasing pretty obviously and an ice pack brings it back down. When I try the same thing on the DHT11 nothing happens. When the board was out of the case it was still running a...
by sean4star
Mon Jul 15, 2013 11:32 pm
Forum: Assembly instructions for the Thinkgeek nixie thermometer
Topic: Troubleshooting
Replies: 119
Views: 222152

Re: Troubleshooting

Yeah...I'll check it when I get home. Just as an update, looks like the temp is holding steady at 83.3. The bottom of the case is fairly warm, primarily at the back, near the T12, which makes sense I think. Looking over the case assembly instructions one more time and I can't tell if the silicone pa...
by sean4star
Mon Jul 15, 2013 5:58 pm
Forum: Assembly instructions for the Thinkgeek nixie thermometer
Topic: Troubleshooting
Replies: 119
Views: 222152

Re: Troubleshooting

Is there any way to tell/test to determine if the TCN75 is soldered and working correctly? I did have some trouble soldering this in the correct place... Short, sad story: I first tried to solder the chip to the SMD pads on the far right of the PCB. I was cussing up a storm because the pads were too...