multiple RFID 552 scanners problem

[propiro]

Hello,
While using this library, im getting really weird results. I must connect 5 scanners to one arduino. My scanners share MISO SCK MOSI and power lines, and when i connect 1 or 2, they work as expected, but when i connect 3,4,5, all of them stop working - only if i disconnect MISO lines of any 3 of them, it'll make other two work.
At this point im clueless, i've tried using voltage of 3.3, 5v, using 5 to 3.3v stabilizers, basically anything i can thing of. I've tried two MEGA arduinos, one leonardo and one UNO, on all of them i have similiar problem.

https://nopaste.linux-dev.org/?1120284
here is code, from multireader example, with added 5 scanners.

[simbadMarino]

Check voltage drop⁣ in your 3.3v or 5.0v, looks like you are exceeding the maximum current and this is causing malfunction in your setup. Good luck! Enviado desde BlueMail ​ En 26 nov. 2016 21:14, en 21:14, propiro <[email protected]> escribió:

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Hello, While using this library, im getting really weird results. I must connect 5 scanners to one arduino. My scanners share MISO SCK MOSI and power lines, and when i connect 1 or 2, they work as expected, but when i connect 3,4,5, all of them stop working - only if i disconnect MISO lines of any 3 of them, it'll make other two work. At this point im clueless, i've tried using voltage of 3.3, 5v, using 5 to 3.3v stabilizers, basically anything i can thing of. I've tried two MEGA arduinos, one leonardo and one UNO, on all of them i have similiar problem. https://nopaste.linux-dev.org/?1120284 here is code, from multireader example, with added 5 scanners. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: #263

[Rotzbua]

maybe duplicate of #191 and #227

[Rotzbua]

In general my experience with spi:

• breadboard + long connector cables -> issues
• breadboard + >=2 devices -> issues

Try:

• shorten connection between Arduino and devices
• use a soldered prototype instead of a breadboard

or

• Arduino mega has more than one hardware spi -> use them -> modify library (I have no clue how)

The correct way to use multiple devices is to use a multiplexer. (see #191 (comment))

[Rotzbua]

@propiro Did you solved your problem? Can you share your experience with us? Otherwise I will close this issue within 14 days. Thanks.

[propiro]

Hello, Sadly, it was caused by noise on MISO lines, and i was unable to solve it, using multiplexing or transistor gates. Client i was makign this project for agreed just to but 5 cheap arduinos, so i hook them together to one arduino mega that controlled locks, and everything worked. Best Regards, A. 2016-12-23 23:51 GMT+01:00 Rotzbua <[email protected]>:

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@propiro <https://github.com/propiro> Did you solved your problem? Can you share your experience with us? Otherwise I will close this issue within 14 days. Thanks. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#263 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AUF2add90UbvCvnja8U2rViHR6T_A8GRks5rLFBsgaJpZM4K9DQu> .

[Rotzbua]

@propiro Cool! Thanks for sharing your knowledge with us. Merry Christmas.