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  #11  
Old 10-08-2017, 11:37 AM
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Dugway Dugway is offline
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Default Remember that the Eggtimer requires you to enter a unique...

...four digit code each time it's activated. I would argue that this a safer than a simple "rod" key, but others may disagree. There is also a unique password for each switch, so no chance of interference between devices. You also get continuity and battery voltage for free.
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  #12  
Old 10-08-2017, 09:38 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by Dugway
...four digit code each time it's activated. I would argue that this a safer than a simple "rod" key, but others may disagree. There is also a unique password for each switch, so no chance of interference between devices. You also get continuity and battery voltage for free.
I agree. As George wrote in one of his attached threads, the system gives continuity *and* misfire indications (if one presses the ignition button on the wireless transmitter and the rocket *doesn't* lift off, but the audio buzzer keeps sounding, the igniter didn't fire--or it did but failed to break [it can happen, rarely, with "hot-wire" nichrome igniters], while if the buzzer stops the igniter burned through without igniting the motor).
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  #13  
Old 10-08-2017, 11:40 PM
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georgegassaway georgegassaway is offline
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Quote:
Originally Posted by blackshire
I agree. As George wrote in one of his attached threads, the system gives continuity *and* misfire indications (if one presses the ignition button on the wireless transmitter and the rocket *doesn't* lift off, but the audio buzzer keeps sounding, the igniter didn't fire--or it did but failed to break [it can happen, rarely, with "hot-wire" nichrome igniters], while if the buzzer stops the igniter burned through without igniting the motor).

Umm, no. None of the wireless systems I used produced any continuity.

The newest one, the fireworks system I got from ebay, does have an LED light up for each output that is "fired". But no sound.

The continuity and buzzer stuff that I did mention in the thread I linked to, made use of a homemade continuity/arming box for each of the two earlier systems I used (and for a long-wire relay system before those).

And one of those features was to have a buzzer ("bzzzzzt" type, not piezo beeper) to sound off when fired. For two reasons. One, to confirm that the system was firing, so if I heard the "bzzzzzt" but no ignition, I knew it was a misfire, not a relay/wireless problem.

But also, as a WARNING, that if I heard the buzzer going off before hooking up the clips, that the relay was hung up (or wireless system firing by accident). A big safety feature. I remember a launch where two totally different relay systems accidentally fired, one I think was hung up mechanically, the other used a too-sensitive sensor in place of a relay, that moisture from rain screwed up (Ironically it was an Impulse Aerospace "Veri-Fire" system!). So two times at that launch on different systems, someone hooked up clips and the rocket took off!

So when I later made a relay system, I made sure to have a warning buzzer to sound when firing, and highly recommend doing so, for relays, at least.

Back to the fireworks wireless system, a buzzer ("bzzzzzt") could be wired in parallel with the micro-clips to indicate the system is firing. An easy thing to add. Doing continuity, more complicated.
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Last edited by georgegassaway : 10-09-2017 at 12:05 AM.
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  #14  
Old 10-11-2017, 01:16 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by georgegassaway
Umm, no. None of the wireless systems I used produced any continuity.

The newest one, the fireworks system I got from ebay, does have an LED light up for each output that is "fired". But no sound.

The continuity and buzzer stuff that I did mention in the thread I linked to, made use of a homemade continuity/arming box for each of the two earlier systems I used (and for a long-wire relay system before those).

And one of those features was to have a buzzer ("bzzzzzt" type, not piezo beeper) to sound off when fired. For two reasons. One, to confirm that the system was firing, so if I heard the "bzzzzzt" but no ignition, I knew it was a misfire, not a relay/wireless problem.

But also, as a WARNING, that if I heard the buzzer going off before hooking up the clips, that the relay was hung up (or wireless system firing by accident). A big safety feature. I remember a launch where two totally different relay systems accidentally fired, one I think was hung up mechanically, the other used a too-sensitive sensor in place of a relay, that moisture from rain screwed up (Ironically it was an Impulse Aerospace "Veri-Fire" system!). So two times at that launch on different systems, someone hooked up clips and the rocket took off!

So when I later made a relay system, I made sure to have a warning buzzer to sound when firing, and highly recommend doing so, for relays, at least.

Back to the fireworks wireless system, a buzzer ("bzzzzzt") could be wired in parallel with the micro-clips to indicate the system is firing. An easy thing to add. Doing continuity, more complicated.
My apologies--I was very tired when I read those linked-to articles.
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR
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