Please help me - school project!!

Sounds like something a length of Nitinol wire would have been useful.

blueroomelectronics said:

Sounds like something a length of Nitinol wire would have been useful.

Click to expand...

sorry, i dnt understand blueroomelectronics

do you mean solenoid?

Google "Muscle Wire" You apply current and it contracts like pulling on a string.
**broken link removed**
**broken link removed**

Ah, i see how that cud have helped heheheee

but i feel somehow i won't be allowed to order that component, in my class =[

thx

For timed switching you have the right circuit.
Problem 1: the 10uF capacitor is not needed
problem 2: you need a diode across the relay coil (diode's+ toward +9v) to protect the 555
problem 3: the timing components will be switching the relay ON for 0.065 seconds and OFF for 0.027 seconds. Way too fast. To colculate timing resistors and caps: **broken link removed**
problem 4: (the big one) timed-reversing mechanical systems will allways "creep" in one direction or the other after several cycles, and not return to the starting place. Even if the timing for both directions is exactly the same, mechanical systems tend to have a little more drag, and move a little slower in one direction. If the wing banks 5.0 cm down in 5 seconds and returns only 4.95cm in 5 seconds, it will eventually not return to the original starting position. That's why people use limit switches to reverse, rather than time.

Ken

sounds like this project isn't done??

going with a reversing circuit to tilt wing in opposite direction is long way around this project
all that is needed is a ir slot interrupter switch, motor and 555 timing circuit for the 5 seconds or desired time.
no confabulated relays needed.
no reversing of motor
no issues of tearing a wing off etc. (if one string is slightly longer then you could tear off a wing)
just have the ir slot switch trigger the timer and the timer turns off the motor for determine time.
OPB837L51 Optek Photointerruptors
555 circuit is just a monostable triggered timer using either 2 - 555's or 1-556, couple of resistors and capacitors.
can't be any simpler.

MrDEB said:

going with a reversing circuit to tilt wing in opposite direction is long way around this project
all that is needed is a ir slot interrupter switch, motor and 555 timing circuit for the 5 seconds or desired time.
no confabulated relays needed.
no reversing of motor
no issues of tearing a wing off etc. (if one string is slightly longer then you could tear off a wing)
just have the ir slot switch trigger the timer and the timer turns off the motor for determine time.
OPB837L51 Optek Photointerruptors
555 circuit is just a monostable triggered timer using either 2 - 555's or 1-556, couple of resistors and capacitors.
can't be any simpler.

Click to expand...

But the problem is im not suure i will b allowed to order them components ...

i can order most common compoenents such as transistors, resistors, 555, etc

As of now, im trying to design a PCB version of this "timing" circuit and the flashing lights circuit.

gona b difficult, but ill try

How long do you want relay ON?

using the schematic you posted using a 640K, 300K and a 100nf you get .06151 seconds HIGH and .020 LOW
with a 75% duty cycle
no where near the 5 seconds you were talking about??

PROBLEM with 555 circuit

If you intend on reversing the motor using a relay then your timing circuit is way off.
here is the same 555 circuit but set up for 5.1 seconds HIGH output and 4.8 seconds LOW output with a 51% duty cycle
**broken link removed**
If you can't use the slot interupter switch then how about a reed switch which is controlled by a magnet on the rotating wheel.
same circuit