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I have the same problem. I have the wiznet 5100 ethernet shield mounted on Arduino Uno. The computer is linked to router by an ethernet cable and the ethernet shield is linked to the router by another cable.

 The problem is most likely with the rj45 socket because i ran the code you posted earlier on this thread and it said 'Starting ethernet ', but said 'Failed' after a minute. The code before that ran perfectly and displayed the ip address.

 I have also checked that the orange and green lights are functioning and there are no solder bridges. I have also checked on a different connection but its the same problem.

(Additional information: My ethernet shield did not have a sticker with the mac address and i made up my own with the following mac address: 0xDE, 0xAD ,0xBE, 0xEF, 0xFE, 0xEE ... Hope this information helps)

Sorry for the long message, but I have to submit a project in a week and am desperate. Please help me find a way, thanks in advance.
Project Guidance / Re: Really new. Need help plea...
Last post by jokefox - Today at 08:37 pm
How did i not see that -.-
Software / libreria <Narcoleptic.h>
Last post by wirefree - Today at 08:37 pm
 salve a tutti   mi potreste aiutare,  non trovo  questa libreria  da scaricare avete un linke per scaricarla <Narcoleptic.h>  grazie mille
General Electronics / Re: IRF 520N with 24V?
Last post by MarkT - Today at 08:36 pm
max gate voltage (Vgs) is nothing to do with the load.

The max gate-source voltage is a limit you must observe or you risk instantly blowing the gate oxide,
whether or not there is any load - this is just like overvoltage damage to a capacitor.  Once you do this
the gate is no longer isolated from the source and drain and you have a crippled device.   If the device is
switching high power gate-oxide failure will then lead to catastrophic failure.

The drain-source max voltage (Vds) is defined as the point where the drain-source leakage current rises above
some nominal point, with the device hard-off (Vgs=0).  Some devices can take a certain amount of breakdown
energy if this is exceeded, as used with ignition systems.  Too much energy will simply overheat (melt) the
device (or even explode it).

The IRF520 is not logic-level, it needs Vgs >= 10V to turn on (nominally 12V).  You've been
sold a lemon.
Logic level devices often have a Vgs requirement of >= 4.5V (nominally 5V).
Hardware / Re: Display TFT 1.8 come si co...
Last post by As_Needed - Today at 08:36 pm
Ma lo sketch che hai usato qual è? Magari doveva fare proprio quello :) Prova semplicemente, con le CORRETTE librerie, a caricare semplicemente un messaggio di testo nel loop, tipo così:

Code: [Select]

  tft.setCursor(0, 30);
  tft.println("Hello World!");

Comunque se proprio non VA, come dici... ti consiglio quello che ho preso io che là ti posso dare una mano e garantirti il suo funzionamento visto che ce l'ho.
Hardware / Re: Detectar chispa en la buji...
Last post by firius2010 - Today at 08:35 pm
El D3 permite filtrar un poco el pulso y que reciba solo pulso positivo, trabaja mejor desde el divisor de tensión y el D4 es para asegurar que el pico máximo sea de 5v antes de entrar al optocoupler.

El circuito es el resultado se varias pruebas y mucha Teoría para que en la práctica funcione con la mayoría de los cables.
Muchas gracias por tu explicasion, entiendo lo del conector que mencionas arriba, y con respecto a D3 dices que para filtrar un poco, pero ¿acaso un diodo filtra? y lo otro ¿para que el pulso sea solo positivo no esta ya puesto D2? el zener si veo claramente el por que, gracias por tu paciencia es que quiero entenderlo bien, tal vez se me escapa algo
Project Guidance / Re: Additional Analog Pins on ...
Last post by alif - Today at 08:34 pm
i have a pro trinket 5v which i can use to connect to, but the resistors are my problem. i have seen online someone using 10k resistors and another one using 1k and 2k resistors. i have tried both but no avail, if anyone could lend a hand it will be much appreciated
Project Guidance / Re: Really new. Need help plea...
Last post by cattledog - Today at 08:33 pm
Code: [Select]
// Data wire is plugged into pin 2 on the Arduino
#define ONE_WIRE_BUS 2
 pinMode(2, INPUT);    // button

Try moving your push button, or one wire bus to a different pin.
That is an option, but is HW serial to the raspberry faster/better than I2C to it?
Serial (hardware or software) requires level translation.  The lines are "driven".  With serial the data rate has to be same on both sides.  For the Arduino the maximum reasonable rate for hardware serial is 1 M.

I2C only needs level translation if lowest voltage device (Pi) cannot trigger a HIGH on the highest voltage device (Arduino).  In your case this has a high probability of being reliable.  With I2C  the data rate is determined by the master (Pi).  I have no idea what the maximum rate is for the Arduino but 400 k seems like a good choice.

Deutsch / Re: PID Autotune
Last post by guntherb - Today at 08:29 pm
Ja, das geht nur mit geschlossenen Grills, z.B. Kugelgrill.
Der meinige ist auch geschlossen, aber selbst gebaut.
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