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Forum Index : Microcontroller and PC projects : FM radio?
| Author | Message | ||||
| davematt Regular Member  Joined: 27/09/2011 Location: AustraliaPosts: 55 |
Has anyone tried the Mite controlled clock radio project in Circuit Notebook, Silicon Chip June edition? I can read the clock chip just fine, but the TEA5767 module is a different story. The frequency setting window is so full of bugs as to be unusable. I sure the designer (Dan Amos) would not have released it like that, so I'm wondering what is wrong. Anyone got it working properly? Or are there likely to be differences between the two TEA modules available. Praps someone has some simple code to just test the radio? TIA, Dave. |
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palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1993 |
There is an Arduino tutorial on the subject that may help you HERE "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5089 |
I dont know this project, but I did play with the cheap modules from China. I have not succeeded to get any sensitivety and selectivity with these modules. The are extremely sensitive to digital noise from the microcontroller. And putting the micro to sleep helps only as long as you can keep it asleep. PicomiteVGA PETSCII ROBOTS |
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| damos Regular Member Joined: 15/04/2016 Location: AustraliaPosts: 74 |
Hi Dave, As stated by Volhout, the modules are cheap and do have their own peculiarities. If you only use strong stations they work well, but if you have weak stations, they have a tendency to skip over them. I only listen to ABC Classic FM which is pretty strong so it works fine for me. I also use the external 3.5mm input, often with a Bluetooth adapter. The modules are really designed as scanners with an up/down to jump to to the next strong station. While the protocol allows you to set the frequency, if it doesn't find a strong signal it skips to the next station, which explains the buggy behaviour. I also agree that they are susceptible to noise. They are cheap, so it is only a single conversion to a very low IF, so they will never have the performance of a high end tuner. Having said that, the sound is surprisingly good if you have a good signal. Dan |
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| morgs67 Regular Member Joined: 10/07/2019 Location: AustraliaPosts: 78 |
Hi Dave, I liked the design so thought I would try it on MM+ Explore. Similar to you the tuning did not work. After reading the data sheet I could see that autotune was enabled when sending the frequency data. I stopped this by the following: Under 'SUB TuneRadio' line 556(?) starting "LOCAL fh' remove 'OR $h40'. Also change the low frequency from 88 to 87.5 (couple of places in program). This makes the inbuilt steps follow the Australian band plan. cheers Tony |
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| davematt Regular Member Joined: 27/09/2011 Location: AustraliaPosts: 55 |
@ morgs67. Bingo! Thanks Tony, now I can at least tune to a station, and just using headphones across the module, it's pretty good. Much better than most clock radios anyway. Thanks to all above, I will reinvestigate after nearly giving up. Would anyone care to recommend an antenna? I'm currently using a few feet of hookup wire... D |
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