I've had a quick squint and the examples seem to be for Arduino. Be aware that the Arduino used 5V but the RPi used 3.3V (even if 5V is available from the GPIO and USB etc). You will need to make sure the electrical interface is OK (or adapted) for communicating between the RPi and the TEA5767 module, but otherwise anything you can do with an Arduino should be possible with an RPi. I say "should be", because the Arduino is just a microcontroller, so it runs your code and that's all, but the RPi usually runs a full-blown operating system so there is all sorts of stuff going on all the time and you have to be careful if you have critical timings.
That won't be so easy. There are no analogue inputs on the RPi, so you will either need an external circuit to do it (HAT) or think of something else. A rotary encoder may be the way to go, so that the shaft rotation is fed into the RPi as a series of pulses which you read in a program to control frequency. All you need to do then is send the frequency to the radio module and display it on the screen.
Plenty. A standard serial data link seems favourite.
maybe you're referring to bi-directional level shifter?finnbo11 wrote: Or alternatively is there another similar chip I could use?
There's nothing "incompatible" about the TEA5767 - I just told you to make sure it would be OK running at 3.3V instead of the Arduino 5V, and the post above says it is. The rest is learning how to code the RPi to run it.
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