Recent content by rkhanso

Thanks for that info. In post #1 and #2 of this forum, it mentions using the LM317 as a constant current source for LEDs, not a constant voltage source. People mention that the LED is a current device, not a voltage device, and the voltage is less important (though if you look at Ohm's law, how...

I searched Mouser for LM317 in the same SO-8 package that the NUD4001 is in so I can use it on the same board that came in the group buy. The only LM317 I found has just a 100ma current rating, while the NUD4001 is 500ma. Unless my search capabilities suck....which they might. If I make the...

Thanks for that great info AAH. I did find this link to the NUD4001 data sheet. On it there is an example using two of the NUD4001 for a dome light application. But that dome light application is using a single LED and thus, a high watt resistor, which I don't really want to do - it doesn't...

Sorry for bringing up this old thread....but it shows you how far behind the times I really am. I never did build all 160 of these I bought parts for, and am now thinking about re-purposing some of the LEDs for something different. I searched for the group buy thread or data on what LEDs I...

Finally hooked up 8 of the strobes on a 24LV board - have a question about the results. Previously, I connected a row of 8 strobes with the same firmware (same random seed number) just to a power supply, and it took around 1 to 1.5 minutes or so for the strobes to get really random. I just...

I found an answer to one of my questions. I downloaded Hi-Tec C Compiler. I'll give that a shot.

Brian, Is this where you changed the values? unsigned char random_byte = 95; //seed value If so is that the only thing you changed? Another question...I'm not a programmer nor that familiar with MPLAB. If I want to change that .c file to a .hex so I can quickly program in PicKit software, how...

David_AVD, Thanks for that info. I was looking at the data sheet for the 4N33. It can handle the 24v input? I will output the 0v and 5v needed for the strobe board, right? Sorry for the crude drawing - I'm not that familiar with the software to make this more legible. But, is this what you're...

I am also thinking this may end up working for me, with a little more thought and design. I planned on using the strobes with a Renard 24LV, which we all know is a positive trigger, and later realized these strobes require a low trigger. Since I already have to drop the 24 volts that I'm...

I tried this and here are the results, starting with all 3 wires from the strobe board connected. After about 60 seconds, you could start to see some variance in the strobe timing After about 105 seconds, the differences got to be looking really random. I pulled pin 4 -trigger off the ground...

Is somewhere in here where we change the 'seed' or whatever creates the randomness? Do any other things need to be changed (//tune the random blink rate or char random_seed_set = 0 or anything else)? Any suggestions on what to change numbers to to get a good variance in flashing? Or, if you...

I made 8 of the strobes and connected power to them - only 7 of the worked. :-\ Took some video for approx 1 minute to see how 'random' the LEDs flash. Here's the result: 8 LED Strobes (well, 7 are working), testing 'randomness' It takes a good 40+ seconds to get them to flash randomly...

I wish I had the free channels to do that too. Will have to think of some other creative way to get satisfactory results. Can someone advise how to change the random number generator thingy, or what I would have to do to get a more random pattern? I don't mind changing the firmware to give more...

I had mixed results when trying the previously failed boards/programming. One said it burned successful after seeing an OSCCAL error, but when powering, the LED never lit up. A couple others would not burn successful, still got the OSCCAL error. I suppose I coulda fried the PICs on those. Well...

I just finished soldering PICs on 8 boards and then went to program the PICs. Here's an observation: The first PIC burned just fine. The second and third and fourth PICs got the OSCCAL error PICs 5-8 were OK. I went back to the PICs that failed and tried them again. One burned OK the next time...