SL018 RFID reader doesn't work for adapter but only work for USB cable- DFRobot Forum

2011-11-14 23:39:29 You wouldn't happen to have a 7V adapter would you? If you do you can try with 7V.

Otherwise, try connecting the 9V adapter and using both the wifi and RFID. It should work. The WiFi adapter might get a little hot, thats ok. If it gets too hot and the connection becomes unstable, try using 7V.

But, between the Wifi shield and the RFID reader, it should be stable. You wont damage the Wifi Shield.

Hector

2011-11-14 23:31:32 Hi hector,

My 9V adapter output 1A.

cielle

2011-11-14 23:14:01 Cielle,

Could you please tell me how much current (Amps) your 9V power adapter has? Hector

2011-11-14 22:46:31 Hi,

Are u meaning connect the device with both USB and adapter together?
Sorry that i don't get you.

Anyway, i have measured some voltage reading. Result value are as below:

Pin Wifishield(V) SL018(v) Remark

[color=purple]+5 4.8 4.8 USB + Wifi (Wifi not connected not router)
A3 3.4 3.4
A4 3.4 3.4
A4 3.4 3.4[/color]

[color=green]+5 3.4 3.4 Adapter + Wifi (LED works, Failed for RFID)
A3 0 0
A4 2.6 2.6
A4 2.6 2.6[/color]

[color=brown]+5 5.2 5.2 USB (LED and RFID works)
A3 3.2 3.2
A4 3.8 3.8
A4 3.8 3.8[/color]

Testing with merely adapter omitted.

According to the obtained result, it seems like USB supply more power for kit.
But it doesn't work for WIFI module.

Please advise, is it ok for me to plugged a 9V adapter instead of 5V?
As i am worried 9V might burn my thing.
I tried to plugged 9V before. But my wifi shield get very hot and LAN connection is very unable.

I need to power up the kit with adapter as at the end the system is gonna to be a stand alone system without power support from PC.

Please advise again!
Many thanks!!!

cielle

2011-11-14 18:51:43 Cielle,

Have you tried providing the external 5V power, and also having your USB connected? Do you have a multimeter? Could you measure the voltage on the Wifi Shield's 5V pin to make sure it is providing enough power to your RFID reader?

Hector

2011-11-14 18:46:49 Hi Cielle,

I am looking at your code now. I just got into the office. ;) Hector

2011-11-14 18:11:11 Hi admin, can i have your advise???

I find no where to debug on this...

Many thanks here! cielle

2011-11-12 02:02:36 Hi admin,

many thanks for your prompt reply.

yes, i have tested for my wifi shield (with adapter 5V and 2A)
i managed to control my LED over the network with TCP Client communication but failed for my rfid reader. (the RFID reader doesn't have its red light blink when i power up the kit and doesn't have its green light blinked when i scan it with a mifare card)

On the other hand,
i have tested same code by using USB power supply from PC.
i can control LED and get rfid reader to read the card with Serial communication.
But the wifi shield failed to connect to router in TCP client communication. Would this because of the power from USB not hight enough for the wifi shield to connect to router?

What is the adapter i should used in order to make the both wifi shield and SL018 rfid tag reader works?

Before this, i used a 9V adapter. the Wifi shield end up too hot and causing unstable LAN connection. Luckily i didn't burnt my wifi shield. Then i replace the 9V adapter to 5V adapter.

below is my code (i modify from those tutorial for testing purpose)

LEC_RFID.pde

[code]
#include <Wire.h>
#include <SL018.h>

SL018 rfid;

void setup() {

Wire.begin();
Serial.begin(57600);

pinMode(13, OUTPUT);

delay(100);
Serial.println("Press any key to continue");
while(Serial.available()==0);
Serial.println(" Lets test the DFRobot WiFi Shield");
Serial.println("Press 1 to light the LED, and 0 to turn it off, 2 to read rfid");
Serial.println("Entery: ");
digitalWrite(13, HIGH);
}

void loop() {

if (Serial.available()){

char input = Serial.read();
switch (input){
case '1':
digitalWrite(13, HIGH);
Serial.println("ON");
delay(500);
break;
case '0':
digitalWrite(13, LOW);
Serial.println("OFF");
delay(500);
break;
case '2':
Serial.println("RFID:");
// start seek mode
rfid.seekTag();
// wait until tag detected
while(!rfid.available());
// print tag id
Serial.println("The tag ID: ");
Serial.print(rfid.getTagString());
break;
}
}
}[/code]

The connections between Wiznet wifi shield - SL018 are as below:
Wiznet wifi shield / SL018
A3/1
A4/2
A5/3
5V/4
GND/5

(SL018 datasheet :http://www.stronglink.cn/download/SL018-User-Manual.pdf)

Hope to have your advise again..

many thanks! cielle

2011-11-12 01:28:24 Cielle,

Have you tested the Wifi Shield on its own, to make sure it is communicating as expected? Make sure the Wifi shield is working by testing it with a serial terminal. You can follow the guide here:
[url=https://www.dfrobot.com/community/index.php/2011/07/tutorial-dfrobot-wifi-shield-sku-tel0019/]https://www.dfrobot.com/community/index.php/2011/07/tutorial-dfrobot-wifi-shield-sku-tel0019/[/url]

It does work with a DC adapter. I'm not sure where the problem might be. What pins are you using for the RFID reader? Could you post the code you are using?

Hector

2011-11-12 00:56:11 Hi admin,

May i have your advise for below?

I am about to integrate my SL018 rfid reader with WIZnet wifi shied on a arduino kit.

But sad to say that

I found that the SL018 only functioning (can read the mifare card) if the the arduino kit is powered up by USB cable (power supply from PC) .. But this provided voltage is not sufficient for my wifi shield to connect to router.

Then, i power up the arduino kit with 5V 2A AC adapter. My wifi shield is able to function at this power but the SL018 doesn't function.

Does the type of adapter would give effect on this?
As i browsed the manual of SL018, stating it require 4.5 to 7.0 VDC supply voltage..

Then may i know does the wifi shield works on a DC adapter? (For now AC adapter works on my wifi shield but not for SL018). I wish to have your confirmation before purchase a new adapter 5V DC adapter.

Please advise..

And appreciate for your time and your aids!

cielle cielle