I have construted the timer, and wish to use it to control a motor on a free-flight glider (college project). And wish for the motor to be on for 2 seconds and off for a time period and on again for another 2 seconds.
Currently the Red LED comes on but i canot get the motor to run!! What is the correct way to connect it up! The three outputs is confussing me? What are the
NO, COM, NC
the motor has positive negative terminals!
and i am currently using a 9V battery
Please Help!!!
Many thanks
To ensure a quick answer, please post at correct location and mention kit reference !
We assume that this post is regarding our MK111 interval timer minikit.
The relay has a normal open and a normal closed contact. If you cut one wire of the motor and you connect the ends to the COM and the NO outputs of the relay, it should interrupt your motor in the desired way.
Yea sorry, was talking about the MK111 thanks for moving it! I will go give your advice a try!
Thanks alot for your quick response!
Just tested again! am still not getting any output! tested with a voltmeter and the whole circuit seems to be working. Exept when testing on the output terminals!!
The red LED remains on at all times, is this a indicator of power or pulse??
Could it be the 9V power source? cant currently find a 12V power source with a low enough curent!
Any ideas??
many thanks
(MK112 is a brain game - the Interval Timer kit is MK111)
Surely, there won’t be any ‘output’ that you can measure with
a voltmeter? The connections at J2 are just to a switch (controlled
by a relay) that is either OPEN or CLOSED.
Am i being completley wrong in thinking that the power supply that connects to the circuit also powers what i wish to power (ie the motor)
having read ur post its led me to believe that the circuit is just a switch (which it is advertised as) and so the motor needs it own power supply in the between the motor and the circuit board which thinking about it makes sense and is what it says on the instructions!!!
Am i being stupied! :oops:
Thanks again your help is very useful
OK then. What i have is:
MK111 timer with a battery conected to the +/- terminals.
I then have a seperate circuit with motor and battery. The circuit is broken by wiring into the mk111 timer to control the motor on and off?
Which terminals do I use?
Sorry for appearing dense, better at flying and building aeroplanes than circuits! :?
"I then have a seperate circuit with motor and battery. The circuit is broken by wiring into the mk111 timer to control the motor on and off?
Which terminals do I use? "
I think the Vel417 guy was right earlier - one connection to Common (COM on J2) and the other to Normally Open (NO on J2).
I am very sorry for continuing to ask the same questions! But am desperate to get this working!
I have now managed to power the motor with the circuit but i still connot get the circuit to interupt the power and turn the motor off and on!
I am sure that the problem is with the No, Com, NC!
I will explain what i have:
I have the one wire off the motor conected to one wire off the battery i am using to power the motor
and the other wire off the motor going into the No conection on J2,
i have the otherwire off the battery going into the NC conection on J2!
The third wire is still confusing me!! Does it come off the same terminal on the motor as the as the wire which goes into NO and then go into the Com conection on J2!
I hope i have worded this clearly!
Thanks again
[quote=“rcflyeruk”]I have the one wire off the motor conected to one wire off the battery i am using to power the motor
and the other wire off the motor going into the No conection on J2,
i have the otherwire off the battery going into the NC conection on J2!
The third wire is still confusing me!! Does it come off the same terminal on the motor as the as the wire which goes into NO and then go into the Com conection on J2!
[/quote]
I think both vel417 and I have answered this, but here is one last shot.
There is no ‘third wire’! You just have a simple loop involving the
battery, motor and switch. Each has two connections. In and Out.
Perhaps a ‘picture’ will help?
[battery]+…NO[mk111]COM…[MOTOR]…-[battery]
Have a look at the diagram at the bottom right of the instruction
sheet: The COM terminal gets connected internally to EITHER
the NO terminal OR the NC terminal. So this gives you a way
of completing or breaking the rest of your circuit under the
control of the timer. For your purposes I don’t think you should
be using BOTH NO and NC.
{disclaimer: I am just another forum user - I am not speaking on
behalf of Velleman, just trying to help.}
Appeciate what you have done. I have tried this, it is the way I thought it should be wired. Unfortunately it still doesnt work. I guess I may have fried a component. Or maybe the 9volt battery i was using to power the relay is to hot / not hot enough the instructions say to use a 12V 100mah supply!!!
Dont know what i’ll do now. Maybe i’ll have to come up with another way of controlling the motor.
Thanks again for all your time trying to help.
It is possible that your 9V battery is not capable of triggering the 12V relay on the kit. Try with a 12V supply.
I have a 12V lead acid battery, but this is 7A, i imagine that would just fry it!! What could i use for the 12V supply??
The 7A a mentioned on your battery is its capacity, this does not mean that it will send a 7A current trough your circuit! The current or capacity rating of a power supply (battery or mains power supply) can always be more but never less than the required current. The voltage, however, has to be correct. A higher voltage can damage the circuit. In this case, your 12V/7A battery will only source the required current trough your circuit. I strongly suggest that you read a basic textbook on electronics, to familiarise yourself with items such as voltage, current, open and closed circuits etc…