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Step 13The software, and a sound file
The programs which were responsible for producing the screenshots in this instructable are all in the zip file here.
A sound file is also included - this will display "instructables" on screen when analysed using Spectrum Lab - but be warned that it takes a lot of tweaking to get the settings right.
The first screenshot shows the section of program which puts out the pixel column in the 'oscilloscope clock'. This section has been expanded into a sequence of seven loops, each producing a frequency each, in the 'hellschreiber clock'. This is illustrated in the second screenshot.
The number of cycles of each frequency has been adjusted so that they take up approximately the same amount of time.
This means that, for the lowest frequency, the number of cycles will be only half that of the highest frequency.
When you need to get your computer display something from inside your microcontroller, try giving hellschreiber a try - it just needs one line on the microcontroller, plus some program memory space. The resulting signal is audio, so that it can be transmitted across a voice link, and the signal is very tolerant of noise too.
Finally, as the HAMs say, "Lets see you in Hell!".
A sound file is also included - this will display "instructables" on screen when analysed using Spectrum Lab - but be warned that it takes a lot of tweaking to get the settings right.
The first screenshot shows the section of program which puts out the pixel column in the 'oscilloscope clock'. This section has been expanded into a sequence of seven loops, each producing a frequency each, in the 'hellschreiber clock'. This is illustrated in the second screenshot.
The number of cycles of each frequency has been adjusted so that they take up approximately the same amount of time.
This means that, for the lowest frequency, the number of cycles will be only half that of the highest frequency.
When you need to get your computer display something from inside your microcontroller, try giving hellschreiber a try - it just needs one line on the microcontroller, plus some program memory space. The resulting signal is audio, so that it can be transmitted across a voice link, and the signal is very tolerant of noise too.
Finally, as the HAMs say, "Lets see you in Hell!".
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