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#1
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generating morse code
On Apr 14, 2:46 am, "D. Stussy"
wrote: "David Griffith" wrote in message ... Does anyone here done something like sending ASCII to a microcontroller which then emits morse code? I'm tinkering around with old telegraph sounders. Yes. I re-wrote the firmware in my Icom repeater, which included the I D section too. Here's a webpage where a fellow has done something similar: http://www.steampunkworkshop.com/ It's on the right hand side of the page, a link called "telegraph sounder" http://www.steampunkworkshop.com/telegraph.shtml I'd note he should have used more and finer wire on his home made sounder electromagnet. But technical issues aside, it's some gorgeous handwork. Also he has a bit of software to convert a RSS feed to the sounder, which is what you might be interested in. I just think it's really cool to have a mix of 1840's technology plugged into a computer. - 73 de Mike N3LI - |
#2
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generating morse code
Michael J. Coslo wrote:
On Apr 14, 2:46 am, "D. Stussy" wrote: "David Griffith" wrote in message ... Does anyone here done something like sending ASCII to a microcontroller which then emits morse code? I'm tinkering around with old telegraph sounders. Yes. I re-wrote the firmware in my Icom repeater, which included the I D section too. Here's a webpage where a fellow has done something similar: http://www.steampunkworkshop.com/ It's on the right hand side of the page, a link called "telegraph sounder" http://www.steampunkworkshop.com/telegraph.shtml That's one of the first places I looked and where I got the idea. However, what he did was have a circuit watch the keyboard LEDs. What I'm trying to do is make something that attaches to an RS232 port. That way, I can run a three or four wire cable from a server in a back room to wherever I decide to put my sounder. There are two ways I could do this. The first is cheap and dirty. It works by energizing the sounder coils whenever RTS is asserted. That would require special program -- not too tough, but won't be as flexible as in the second approach. The other is to buffer RS232 in a microcontroller, convert to morse code, then tap out the message. In effect, this creates a one-way serial-to-telegraph modem. That second approach is what has me most interested. Suppose you have a server writing logs to a serial port... See the sort of bizzare fun that can be had? -- David Griffith --- Put my last name where it belongs |
#3
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generating morse code
David Griffith wrote:
Michael J. Coslo wrote: On Apr 14, 2:46 am, "D. Stussy" wrote: "David Griffith" wrote in message ... Does anyone here done something like sending ASCII to a microcontroller which then emits morse code? I'm tinkering around with old telegraph sounders. Yes. I re-wrote the firmware in my Icom repeater, which included the I D section too. Here's a webpage where a fellow has done something similar: http://www.steampunkworkshop.com/ It's on the right hand side of the page, a link called "telegraph sounder" http://www.steampunkworkshop.com/telegraph.shtml That's one of the first places I looked and where I got the idea. However, what he did was have a circuit watch the keyboard LEDs. What I'm trying to do is make something that attaches to an RS232 port. That way, I can run a three or four wire cable from a server in a back room to wherever I decide to put my sounder. There are two ways I could do this. The first is cheap and dirty. It works by energizing the sounder coils whenever RTS is asserted. That would require special program -- not too tough, but won't be as flexible as in the second approach. The other is to buffer RS232 in a microcontroller, convert to morse code, then tap out the message. In effect, this creates a one-way serial-to-telegraph modem. That second approach is what has me most interested. Suppose you have a server writing logs to a serial port... See the sort of bizzare fun that can be had? Absolutely! I would think something like this would be fairly easily done in an Arduino or basicStamp. The hardware would be near trivial -- get the thing some power, provide a RS-232 driver, and a open-collector transistor to drive the sounder. (what kind of voltage/current does a sounder want?) You'd have plenty of spare output lines (since you only need one to drive the sounder!) so you could generate a keyed tone on another output for driving a speaker, useful once you find out why they dropped sounders like a hot rock once someone invented the BFO(grin)! -- Doug Smith W9WI Pleasant View, TN EM66 |
#5
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generating morse code
David Griffith wrote:
I suppose the next thing to do is look for a good simulator that runs on Linux. The Arduino development environment is, if I recall properly, written in Java & should run on Linux. Don't know about a simulator. The power requirements of sounders depend on the ohm ratings of the coils, which is usually stamped somewhere on the sounder. The lower the ohms, the lower the voltage requirements. Some modern things need to be done like adding more resistance so it won't be too sluggish. Also a pair of zeners back-to-back is recommended to prevent something (I forget what). Voltage spikes, which could kill the driver. I don't really have a handle on the magnitude of the current involved in running a sounder, but I think you'd almost certainly want some kind of driver stage (a transistor or two, depending on the current requirements) between the microcontroller and the sounder. Spike protection would be part of that circuit. Another thing I'll need to use a few lines for would be some means of varying the output speed. Yes, an alternate output could ride along for free. Perhaps also a relay to go to the key input of a radio. Arduino has analog inputs which could be connected to a potentiometer for varying the Morse speed. -- Doug Smith W9WI Pleasant View, TN EM66 |
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