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Thread: PixelRadio, a DiY FM Transmitter with RDS RadioText

  1. #331
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by ThomasLED View Post
    I believe the stock resistor is 5% or better. This component is in the WiFi chip's RF signal path so choose a Microwave Thin Film type resistor.

    - Thomas
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  2. #332
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Last time I checked 0.1% of 0 and 1% of 0 and 5% of 0 are all the same value... just sayin...

    And also 0 ohm 0402 resistor == small piece of wire == a small solder blob. Now because it is at 2.4GHz, the wire and the solder blob might not have the same parasitic C's and L's as an 0402 "0 ohm" resistor does...

  3. #333
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Getting around -48 RSSI about 30-35ft from router. Worth the Antenna mod?
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  4. #334
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by Kev7274 View Post
    Getting around -48 RSSI about 30-35ft from router. Worth the Antenna mod?
    If that's near the location you will be using it at, then -48 is a good signal. I haven't got mine built yet, waiting on a few more AliX parts to come in but do have the boards and a good bit of the other components. I plan on doing the antenna mod just for future proofing and to give me the most flexibility.

  5. #335
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Quote Originally Posted by jerryg View Post
    If that's near the location you will be using it at, then -48 is a good signal. I haven't got mine built yet, waiting on a few more AliX parts to come in but do have the boards and a good bit of the other components. I plan on doing the antenna mod just for future proofing and to give me the most flexibility.
    Yeah,I will probably do it also. I got a few spares in case I screw one up.
    Last edited by Kev7274; 09-12-2022 at 04:46 PM.
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  6. #336
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    If anybody has any spare LILYGO T8 V1.7.1 ESP32,PM me. I got a message that my current order won't ship for 7-10 days.
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  7. #337
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Thank you for such a great project Thomas, I have been looking for a DIY cost effective way to transmit RDS to our audience! Just have not had the confidence to mess with RF yet. This project is helping me more understand RF than I did before! Just got my boards now waiting for the components! Getting excited. One question though. Would any esp board work or is the reason why you chose the ttgo is for the IPX connector? Just curious if I should take the time and play with an any of my esp-8266 or 32 boards!
    Last edited by Mghaff007; 09-14-2022 at 11:15 AM.

  8. #338
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    One question though. Would any esp board work or is the reason why you chose the ttgo is for the IPX connector?
    Not impossible to use other ESP32 boards, but somewhat of a nuisance to do that. That's because the various ESP32 boards have different pin placement / footprints. Plus some GPIO pins would need software changes. So it's not a drop in effort; at best there would be PCB cuts, jumps, and maybe a bit of voodoo.

    TL;DR: Use the specified ESP32 board to minimize build frustration and drama.

    EDIT: If you just want to play with the web interface (without the radio hardware) then I suspect any ESP32 board could be used. The Main Tab will report a radio failure and serial log will be flooded with error messages, but the various tabbed menu features will be displayed so you can get a taste of how PixelRadio is configured.

    - Thomas
    Last edited by ThomasLED; 09-14-2022 at 06:19 PM.

  9. #339
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    Thanks for that! That was exactly what I was looking for! I had noticed while comparing boards today that the t-8 might be very useful in some of the other projects to tackle. Mainly the espixel stick with micro sd and all the available pins. I will be playing with the interface until the rest of my parts come. Thanks again for all the work you have done.

  10. #340
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    Default Re: PixelRadio, a DiY FM Transmitter with RDS RadioText

    I had noticed while comparing boards today that the t-8 might be very useful in some of the other projects to tackle. Mainly the espixel stick with micro sd and all the available pins.
    My introduction to the LILYGO ESP32 TTGO T8 V1.7.1 was when I built two ESPixelSticks last year. The only hardship was getting the SD card to work (code changes were submitted / added to ESPixelstick). The T8 V1.7 ticks all the boxes: built-in SD card, generous GPIO pin count, and supports external WiFi antenna for improved WiFi range.

    Thanks again for all the work you have done.
    You are welcome. It is my pleasure to contribute to the pixel hobby.

    - Thomas

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