Having trouble with long wires (+-5m) about rfid

[podaen]

It has to be the long wiring, I triple checked evrything.

[podaen]

This is how I connected it

SDA 5
SCK 18
MOSI 23
MISO19
IRQ /
GND GND
RST 16
3V3 3V

[podaen]

I have it working, The ground was not connected and while testing I have added this line in the setup witch is wrong digitalWrite(RST_PIN, LOW);

[starfield33]

What I did was to put one ESP32 at each reader, and then let them communicate via wifi, Bluetooth, serial or Cbus. You then have ports to open doors & lights.

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On 21 Apr 2022, at 10:17, Davy P. ***@***.***> wrote:  This is how I connected it SDA 5 SCK 18 MOSI 23 MISO19 IRQ / GND GND RST 16 3V3 3V — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you are subscribed to this thread.

[podaen]

It didn't work aqtually wel. It seems that multiple spi devices aren't really supported
I suggest you add SdSpiConfig spiconfig (CS_PIN, SHARED_SPI, SD_SCK_MHZ(4)); to your library

I also tried this

    pinMode(RST_PIN, OUTPUT);//power on reset pin high
    digitalWrite(RST_PIN, HIGH);

    pinMode(SS_PIN, OUTPUT);//cs pin rfid high = disconnected from spi
    digitalWrite(SS_PIN, HIGH);//power down

it didn't work. The two seperatly it work, but when connecting the SCK, MISO, MOSI it doesn't work anymore.

[DrLou]

Though we haven’t tested this, empirically, here, I’ve been advised by colleagues expert in SPI that long distance connections shouldn’t be relied upon in designs. We use SPI for a number of devices, and had envisioned distancing sensors, for example, at about 10 meters. My sense is that the voltage drops alone would make such a design troublesome. Lou Picciano

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On May 20, 2022, at 10:34 AM, Davy P. ***@***.***> wrote: It didn't work aqtually wel. It seems that multiple spi devices aren't really supported I suggest you add SdSpiConfig spiconfig (CS_PIN, SHARED_SPI, SD_SCK_MHZ(4)); to your library — Reply to this email directly, view it on GitHub <#583 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABFSOOVIF5LZI5KCVU2NNLVK6PHZANCNFSM5T6J6ZOQ>. You are receiving this because you are subscribed to this thread.

[podaen]

The length is not really an issue when they work sepratly, but together... I had a simulare issue on keypad with long wiring (non spi), they implemented scantime for that.

Anyway I had an other project with a display also connected with spi with a length few meters and after a couple of mounths it didn't work anymore ether. I dicided to, to connect them wireless. I think I am going to let it go. It will limit the distance of the rfid to the controller... In my case 5 meters would not be a problem.

I will use esp_now because I am using wifi on that particuare device. And wifi and bluetooth at the same time also doesn't work wel, but thanks for the info.

[Rotzbua]

As @DrLou mentioned I agree that is is an electrical engineering challenge. There are various reasons for failing.
I know setups using 2m wiring having stability issues. They used thin not shielded wires. After switching to shielded quality wires it worked.

I do not see an issue in the code of this library. Due to this fact I would recommend @podaen to search help in an electrical engineering forum.

[starfield33]

Something that i am using with ESP32 is canbus and I’ve got that in multiple ESP32 boards talking to each other and they’re over some good distances. MCP2515 I’m looking for an ESP32 board with the MCP2515 bus module on it if anyone has seen one let me know. ;) Very Best Regards, | Mit freundlichen Grüßen Graham Andrews ***@***.*** ***@***.*** ‭ [phone] Mobile - Europe

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On 20 May 2022, at 19:22, Davy P. ***@***.***> wrote:  The length is not really an issue when they work sepratly, but together... I had a simulare issue on keypad with long wiring (non spi), they implemented scantime for that. Anyway I had an other project with a display also connected with spi with a length few meters and after a couple of mounths it didn't work anymore ether. I dicided to, to connect them wireless. I think I am going to let it go. It will limit the distance of the rfid to the controller... In my case 5 meters would not be a problem. I will use esp_now because I am using wifi on that particuare device. And wifi and bluetooth at the same time also doesn't work wel, but thanks for the info. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you commented.

[podaen]

How long do you have it working... Year, month, days? And what protocol, RS485, RS232, ...

[podaen]

Is still SPI I see, but with a better error handling... Do you have it working with more than two devices? Or is it limited to two devices?

[podaen]

Is it this board you are using?