- #Arduino morse decoder lcd dsp serial
- #Arduino morse decoder lcd dsp software
- #Arduino morse decoder lcd dsp code
- #Arduino morse decoder lcd dsp download
#Arduino morse decoder lcd dsp code
decided to take a shortcut and use some modern technology to make it easier to translate Morse code back into readable text. His project log is a good example of the natural progression we all make when we are learning something new. He started out with an Arduino and a simple microphone.
#Arduino morse decoder lcd dsp serial
He wrote a basic sketch to read the input from the microphone and output the perceived volume over a Serial monitor as a series of asterisks. The more asterisks, the louder the signal. He calibrated the system so that a quiet room would read zero. He found that while this worked, the Arduino was so fast that it detected very short pulses that the human ear could not detect. This would throw off his readings and needed to be smoothed out. If you are familiar with button debouncing then you get the idea. He ended up just averaging a few samples at a time, which worked out nicely.
#Arduino morse decoder lcd dsp software
The next iteration of the software added the ability to detect each legitimate beep from the Morse code signal. The result was a series of long and short chains of asterisks, representing long or short beeps.
The third iteration translated these chains into dots and dashes. This version could also detect longer pauses between words to make things more readable.įinally, added a sort of lookup table to translate the dots and dashes back into ASCII characters. Now he can rest easy while the Arduino does all of the hard work. Posted in Arduino Hacks Tagged amateur radio, arduino, ham, microphone, morse, morse code, radio, speaker, translate Post navigation If you’re wondering why anyone would want to learn Morse code these days, it’s still a very simple way for humans to communicate long distances without the aid of a computer. I am a ham radio operator who struggles to use Morse code. I have used automatic reading devices, but the ones I’ve used don’t work very well on real-world weak signals which have static in the background. The reason? They seem to determine the presence or absence of a tone by the volume of the audio received. The ear, on the other hand, determines the presence or absence of tone based on the spectral purity of the signal received. The ear easily hears the difference between a tone and a static crash. It’s a lot more difficult for a computer to do that, if the computer is working strictly on the volume of the audio. Here you can find an other danish ham which have been working on the code Here a project from a oz1edr oz1edr.dk/Arduino%20Uno/CW%20dekoder/Arduino%20CW.htmĪnd another link and in a USA ham newspaper key thing the ear picks up is not only the presence of noise of the proper frequency, but the relative absence of noise of other frequencies. Here you can see Mr.Chiba very fine website /entry/2015/28Īnd here you can see how JA9MAT Hidehiko build it with chinese letters Download Mr.
#Arduino morse decoder lcd dsp download
Here you can download the code : Download version 1.1 Right click on the mouse and chose save as. If you get a lot of noise in when you have your volumen on the prefereed place then set the 2 values up with 50. here they are 100, if your transiver shall be turned up to get the decoder working then set the values down.
Go 50 up or 50 down with both of them in same time. If you have trouble with the audio is to high og to weak yo can try to set the 2 values for magnitude. NOW YOU CAN USE THE DECODER WITHOUT ANY MORE MODIFICATIONSīut if you want another center frequency you and want to change how wide the filter shall be, you have to change the following lines also.īe aware of that you can only chose some excact frequencies and only a specified number of samples.įor a start take the n=48 ( testdata ) and then you can chose 558 hz or mabye 744 hz which are good for recieveing. Then you have to set which pin you use for AudioIN and which pin you use for the Led. Tell the liquidcrystal library which pins you use for the display and underneath that which kind of display you have just connect and then the code will manage when you have done the setup. The code can take different kinds of displays 2*16 or 4*16 or 2*20 or 4*20. Just 2 10k resistors betwen gnd and 5 volts and then a capacitor in serie with the audio signal. A Arduino UNO board and a LCD board and then a few components. You can read about the goertzel formular here :Ĭourses.cs./courses/cse466/12au/calendar/Goertzel-EETimes.pdf Hardware build by OZ2HNS for use in our clubstation OZ8SMA Here is a video where you can see the decoder in function. The magic in this code is the tone detection based on the goertzel formular, which means that you just put in the audio on an analog pin and then the processor make some calculations and if there is a tone you will get a magnitude value. If you want to build a cw decoder without using other active components than an atmel 328 - Arduino UNO, then this is sure something for you. EASY BUILD CW DECODER BASED ON DSP GOERTZEL CODE
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