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So my younger son, only 2.5, has a lion chief little steam switcher from the entry level starter set.  He takes almost everywhere, similar to how some other kids take a stuffed animal around.  Now the engine itself has a number of limitations but he loves it, so let's leave that alone.

What I would like to do is to be able to add a timer in the remote so that the bell switches itself back off after about 10 or 15 secs.  If anyone here has let the public run a LC engine at a show then you know how the bell tends to get left on by little ones and is enough to drive the must serious train nut out of their mind after listening to it for 20 minute stretches over  and over again for several hours. 

I thought his little engine was dead in the water after all the abuse it takes but sure enough with some aggressive cleaning I was able to get it running again yesterday morning.  Much of the remainder of the day was spent with echo's of "Turn off the bell" coming from other parts of the house.  

Has anyone manufactured such a circuit and would you be willing to share?  this is outside my area of expertise.

Additionally, how the heck do you open a LC remote without destroying it?  I got his about 3/4's of the way open but the upper portion just wouldn't move.  Do I need a special tool to get the post-in-cylinder type connection apart, or is it glued together?

All help appreciated,

John Z.

Original Post

Hello there John.  

First off, on getting the remote apart, you will most likely damage the speed control knob if you are not very, very careful, as it is made of a soft plastic that will deform a little as you pry the knob off.  you might try pulling it off with pliers with some soft cloth over the jaws, but I had the best luck using two small, flat screwdrivers from either side.   What is hanging you up is a nut that is under the knob that secures the shaft of the potentiometer to the remote's shell.  Once the knob has been pulled off, it should be easy to remove that nut.  

On the circuit, I have not done what you are suggesting, but I have torn into a remote for another project and don't see why it couldn't be done... though there is relatively little space in the remote for additional circuits.  It is also important to note that the remote's electronics run at 3.3 volts, so that may or may not be an issue.  

The short of it is, if I recall correctly the buttons are activated by a low (0 volt) pulse, so you would need a circuit that can detect when the button is pressed, then some time after that signal, say 20 seconds, produce another low pulse on the button.  To fit in the remote and run off of its power I think this could best be achieved with a small PIC microcontroller, but I'm afraid I', inexperienced with those.  doing this myself, I would use an arduino-type  board, perhaps a "tiny" or a pro-mini if it can be shoehorned into the remote.  

Another option that comes to mind is to use one of the esp8266 Wifi boards for 99 cents.  these can be programed to perform simple microcontroller code, but is once again a bit beyond my current knowledge.  

Over all, I'd say it is perfectly reasonable to think what you want CAN be done, it is mostly a matter of the available space in the remote for an additional circuit.  If there is room for a 3.3v pro-mini, I'd be happy to write the code for you and explain further how to set it up.  If there is not room, then it will take some more thought as to how to do this.  

Feel free to email me or write back here, and if it sounds like you want to go forward, I'll pull apart a remote and check the clearances to see what we can fit in there.  

Here is what I've done with the remote in my project:  

JGL

Johngaltline@comcast.net.  

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