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A few things to consider :-
1) Have you checked that the motor stall/start-up current is less than 200mA (the maximum current a 555 is rated for)?
2) A motor has considerable inductance. Read up about back-emf voltage spikes and precautions you can take.
3) What makes you think pressing the button a second time should stop the motor?
4) Always post a schematic of your circuit.
Can you post links to that?the circuit i made above is based on reports and research
Using the below pic, what are the values of the indicated parts?
View attachment 107115
Cap(s) will have a number followed by "μF". The Resistor will have colored bands.
Normally, a "One-shot" 555 circuit will have only ONE cap where your circuit has 2 (as shown below).
Also, when "bread boarding" a circuit such as yours, you have to be very careful that each component's leads (wires) are making good connections with the contact(s) of the board. Make sure the polarity symbols, if present, (+ and -) of the caps are attached to the correct bread board terminals.
This is an equivalent schematic of your circuit (values are intentionally absent):
View attachment 107114
Can you post links to that?
Using the same push button to start the timer and to stop it prematurely would involve a more complex circuit. Are you allowed to use a separate switch to stop the timer?
This is a self triggering, 29sec, monostable delay timer circuit. Pressing the push button once "latches" it in the ON position. The timer output will remain on for the time duration set by the 2 caps and the 51k resistor. To restart the timer, press the switch once to turn it off and then again to turn it back on.
If at any time during the ON delay period you wish to terminate the output, just press the switch to turn the timer OFF
View attachment 107142
You'll have to find a SPST "Latching Push ON - Push OFF" switch, like this. The added diode (in this case, a 1N4148) is for rapidly bleeding off the 2 caps between power application(s) of the timer. This will maintain the accuracy of the delay timing when re-powered (everything starting as close to zero as possible).
Other than this circuit, there are no 555 latching timer circuits whose output can be toggled between On and OFF with only one SPST switch.
Yes.Sorry, but to clarify those u said. Does this means that I have to press the switch to start the motor and when i press the switch again it will stop whether or not the 29secs have passed? So, even if i leave my switch on, after 29secs it will stop? Also, even if for example i let it run for 10secs thn i off it and on it back again does the 29secs restarts?
No. The new switch is a "latching" type. What that means is when it is first pressed, it is turned "ON" and it stays ON (is "latched" in a "down", or ON position) until it is pressed a second time, which releases the latch, allowing the button to rise, placing it in the OFF position. And ANY latching SPST switch will suffice. The one I suggested was simply the best, in this case, of the many available.Also, is it possible that i use this switch ? or it has to be the one u stated?
Working on that now. I'll post it later.Sorry, but do u mind showing me how to connect it on a bread board?
Yes.
No. The new switch is a "latching" type. What that means is when it is first pressed, it is turned "ON" and it stays ON (is "latched" in a "down", or ON position) until it is pressed a second time, which releases the latch, allowing the button to rise, placing it in the OFF position. And ANY latching SPST switch will suffice. The one I suggested was simply the best, in this case, of the many available.
Working on that now. I'll post it later.
Single Pole Single Throw switches have only two connectors.
Latching SPST switches also only have two connections, but the button itself, when pressed down (which often makes a "click" sound with each pressed) will remain in the down position (ON) until pressed again, releasing the latch (again clicking) and returning to the up or OFF position.
Note differences between old:
View attachment 107164
and NEW
View attachment 107165
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