kopia lustrzana https://github.com/markondej/fm_transmitter
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# FM Transmitter
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Use the Raspberry Pi as an FM transmitter. Works on every Raspberry Pi board.
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Just get an FM receiver, connect a 20 - 40 cm plain wire to the Raspberry Pi's GPIO4 (PIN 7 on GPIO header) to act as an antena, and you are ready for broadcasting.
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Just get an FM receiver, connect a 20 - 40 cm plain wire to the Raspberry Pi's GPIO4 (PIN 7 on GPIO header) to act as an antenna, and you are ready for broadcasting.
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This project uses the general clock output to produce frequency modulated radio communication. It is based on an idea originally presented by [Oliver Mattos and Oskar Weigl](http://icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter) at [PiFM project](http://icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter).
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## How to use it
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@ -31,7 +31,7 @@ On Raspberry Pi 4 other built-in hardware probably interfers somehow with this s
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```
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make GPIO21=1
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```
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2. Change either ARM core frequency scaling governor settings to "performance" or to change ARM minium and maximum core frequencies to one constant value (see: https://www.raspberrypi.org/forums/viewtopic.php?t=152692 ).
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2. Change either ARM core frequency scaling governor settings to "performance" or to change ARM minimum and maximum core frequencies to one constant value (see: https://www.raspberrypi.org/forums/viewtopic.php?t=152692 ).
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```
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echo "performance"| sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
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```
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