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Location: Zombie Survival & Defense Wiki Discussion Forum
Discussion: Traps
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White76Knight |
80. RE: Traps
Feb 21 2012, 10:22 AM EST
| Post edited: Feb 21 2012, 10:23 AM EST
"well best trap i can think of without reposting would be hundreds of small holes about six inches deep covered with twigs some leaves and a bit of dirt. It wouldnt kill it would just trip up attackers and sprain or break ankles or at least eliminate stealth. Since zombies don't heal it would reduce any ones mobility and if i hit one of my own traps i wouldn't die and well if a zombie trips it the trap is still useful against other zombies."I've heard these referred to as Gopher Holes. Not a bad idea actually. Do you find this valuable? |
Zee-Man |
81. RE: Traps
Feb 21 2012, 4:44 PM EST
| Post edited: Feb 22 2012, 3:50 PM EST
"In any case, the system you describe sounds good. Anyone have any other suggestions? Assuming availability of components...""RE: Wall alarm triggers Current interuption system is a very good idea. for a long wall you will need multiple hundreds of feet of bell wire. Voltage is not the issue, you will be testing for continuity. Let's work with a small section of the wall, having points A and B. At point A you have a normally open (N/O) single pole single throw (SPST) momentary contact switch. A pair of wires run from the switch to the control room. From point B a string, preferably easily broken, runs to and is tied to the switch in a fashion that holds the switch closed. In the control room is the "sensing circuit" which will be comprised of a relay and logic circuits. As long as there is some current the relay allows current to flow across its other two legs lighting the indicator light. When the string between A and B is broken the N/O switch breaks the current making the circuit noncontinuous, thus triggering the transistor and killing the light. You can wire the transistor to turn the light on also. This is the premise of any continuity tester, which type of transistor (NPN or PNP) just determines if the light is normally on or normally off. This arrangement keeps your voltage needs very low, no more than is needed to light all of your indicator lights. If these are low energy LEDS then 9V is likely enough. Edit: Break WOT and add transistor info Edit: Added momentary contact term to the N/O switch nomenclature Do you find this valuable? |
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Zee-Man |
82. RE: Traps
Feb 21 2012, 4:49 PM EST
| Post edited: Feb 22 2012, 2:52 PM EST
RE: Wall alarm triggers part 2Miniature laser pointers and a photovoltaic cell can replace the string and switch. The mini laser only needs 6V in most cases. Solar charged patio lights might do the trick, not sure how the mini laser will drain their batter(ies) though. The unit cost either way is only a few dollars(I would think < US$10) for the 2 "sensing" ends, the wire on the other hand, even at 22 ga, is going to mount up. A Continutiy Circuit Tester A Simpler Test circuit Notice the component parts show the 2 types of transistors Edit: Corrected a component term Do you find this valuable? |
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White76Knight |
83. RE: Traps
Feb 21 2012, 9:20 PM EST
"RE: Wall alarm triggers part 2How would one wire this circuit so that the light was normally off, but came on when the circuit was broken? And could the light be replaced by, or combined with, a buzzer so that those on watch don't accidentally miss the light if they happen not to be looking at it just at that moment? I also like the idea of using lasers to replace the string and switch. How would one wire that up? Do you find this valuable? |
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bolvark |
84. RE: Traps
Feb 22 2012, 2:08 PM EST
a lot of single use or signel use per set traps hear how about a decoy hanged a ways off a ledge of a skyscraper zombie walk up to the top they jump fall and either die or get hurt and if they can still move they might just go back up.
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Zee-Man |
85. RE: Traps
Feb 22 2012, 2:37 PM EST
| Post edited: Feb 22 2012, 6:03 PM EST
"How would one wire this circuit so that the light was normally off, but came on when the circuit was broken? And could the light be replaced by, or combined with, a buzzer so that those on watch don't accidentally miss the light if they happen not to be looking at it just at that moment?Original reply was incorrect - see post # 88 Do you find this valuable? |
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Zee-Man |
86. RE: Traps
Feb 22 2012, 2:50 PM EST
| Post edited: Feb 22 2012, 5:49 PM EST
"I also like the idea of using lasers to replace the string and switch. How would one wire that up?"The laser is the string The photovoltaic cell is the switch (and the power source for the input side) The photo cell emits a low voltage which may need to be amplified or stepped up to charge the relay. This would also be the solution to the voltage drop over long runs of wire. The laser needs its own power source, which could be a rechargeable battery connected to a solar cell. Light charging a battery to power a light that charges the sensor, OMG. Remember that the photocell needs to be shielded so only the laser is acting on it. Drawback: once the beam is no longer interupted the system return to normal and the indication in the control room is lost. A trapping circuit would be needed to prevent this. Do you find this valuable? |
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White76Knight |
87. RE: Traps
Feb 22 2012, 4:01 PM EST
"The laser is the stringI get that part, but I presume that the lasers and the photo cells would have to be wired for power separately? Do you find this valuable? |
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Zee-Man |
88. RE: Traps
Feb 22 2012, 5:39 PM EST
"Original reply was incorrect - will replaceIn this case you will use a relay instead of the LED in the circuit tester. A relay has an input side and an output side. The input side is connected as if it were the LED. It has a power source that is separate from the output side. The output side has 3 pins. 1 is common consider it the positive terminal. The second pin is N/O the 3rd pin is N/C. When current is applied to the input side it causes pins 2 and 3 on the ouput side to change states. The positive lead from the power source is connected to pin 1. The buzzer is connected to the N/O pin and the negative lead of the power source. The anode of the LED is connected to the N/C pin. The cathode of the LED is connected to the negative lead of the power source. When the input is not charged the light is on and the buzzer off. When the input is charged the light goes off and the buzzer goes on. This can be done with transistors instead of a relay. I am no longer sure how to wire them for this application, sorry. Drawbacks to this arrangement: 1) The input side must have enough power to charge the relay. Power drops as the physical length of the circuit increases. 2) The light being off in the normal state gives no indication that the circuit is working. 3) The full arrangement is needed for each wall segment. To have the light on until the trigger is tripped and also have a buzzer you would reverse the output of the relay Relay 1 has the LED connected to the N/O pin on the output side and the buzzer connected to the N/C pin. While the input is charged the light is on and the buzzer off. While the input is NOT charged the light goes out and the buzzer sounds. Advantages: 1) Light normally on indicates the system is working. If the light is out and the buzzer is silent then there is a problem with the circuit. 2) Only one buzzer is needed for all wall segments. Do you find this valuable? |
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Zee-Man |
89. RE: Traps
Feb 22 2012, 5:56 PM EST
"I get that part, but I presume that the lasers and the photo cells would have to be wired for power separately?"Dammit, I was re-writing as fast as I could. You viewed it before I finished! I was not happy with my circuit descriptions as I originally wrote them. I could not remember the correct useage of the transistors as relays, so I wiped that and re-wrote it to use electromechanical relays. Transistors can be used as relays with the advantage of the input being able to be very small. Solid state relays can be used also. SSRs are essentially NOT logic circuits made using field effect transistors. Do you find this valuable? |
Uzzgub |
90. RE: Traps
Feb 22 2012, 6:48 PM EST
One thing to bear in mind with the humane traps is thisLittle Timmy walks along and gets caught in the noose so he is dangling by his foot 4' in the air, he calls out and starts crying to get someone to get him down Something hears him, the bush's rustle, he thinks mummy has come to save him...... 3 Zeds walk out the bush, and he is dangling 4' in the air and about to be eaten to death not a nice way to go Now I'm not saying that its a bad idea (as those are the traps I would go for) but there is a downside to trying to be nice Do you find this valuable? |
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White76Knight |
91. RE: Traps
Feb 22 2012, 10:02 PM EST
"In this case you will use a relay instead of the LED in the circuit tester. A relay has an input side and an output side...."LOL - Wow, my eyes glazed over a little reading all that, but I think I got it though. Is there any chance that you could draw a diagram of this circuit? And perhaps another of how you would incorporate lasers and photo cells into the same circuit? Do you find this valuable? |
TreeLegs |
92. RE: Traps
Feb 22 2012, 10:16 PM EST
To ZM................Can you just make it and sell it lol? Do you find this valuable? |
