Comments on: Arduino Ethernet Web Server with Relay

By: Mark

Mark — Sat, 01 Mar 2025 18:59:04 +0000

Line 86 -> if (strstr(linebuf,”GET /relay1off”) > 0){

Compile error: ordered comparison of pointer with integer zero (‘char*’ and ‘int’)

Any suggestions?….

By: Sara Santos

Sara Santos — Thu, 13 Jun 2024 09:09:24 +0000

In reply to Paul Greenwood.

Hi.
No.
I went to FEUP (Faculty of Engineering in Oporto).
Regards,
Sara

By: Paul Greenwood

Paul Greenwood — Wed, 12 Jun 2024 20:36:43 +0000

Hi Sarah,

Sorry that this is not the place to ask, but did you go to Manchester University?

By: TT

TT — Sat, 06 Jan 2024 14:06:10 +0000

I forgot to mention, I already tied modifying this line: from Ethernet.begin(mac, ip);
to this Ethernet.begin(mac, ip, server); which did not resolve the issue.

By: TT

TT — Sat, 06 Jan 2024 13:50:50 +0000

Hello,
I’m new to Arduino, and found this relay control project and am having some fun. It works really well. I’ve done port forwarding on my router, so I can control it externally from the web on my mobile phone. I’ve hooked it up to my furnace so I can change the heat setting remotely, so I’d like to change the default port to a more obscure setting to keep unwanted agents from accessing it. Any attempts I make to change it from the default port, (by appending the ip address with a colon and port number), result in a message “This page isn’t working 192.168.xx.xx sent an invalid response.” ERR_INVALID_HTTP_RESPONSE
I’ve tried this on the local LAN to rule out any ISP or Router anomalies. Does the port change need to happen somewhere else in the code, in addition to the “EthernetServer server(80);” I’m using a “HiLetgo W5100” ethernet shield I got from amazon for $15.00
Thank you!

By: nuno campos

nuno campos — Sun, 23 Apr 2023 21:45:03 +0000

In reply to Rui Santos.

Olá… este projeto era perfeito para uma pequena situação que tenho em mãos.

Preciso de controlar uma placa de 4 reles para ligar e desligar camaras mas depois de alterar o código para tentar aumentar o numero ( com sucesso ) a pagina web surge com os botões a desaparecer quando se carrega neles… pode ajudar ( pago se for preciso )

By: Krish

Krish — Mon, 05 Dec 2022 08:44:55 +0000

In reply to Sara Santos.

HI Sara
Thank you for the response. I did manage to work it out. I just had to pursue a bit more before giving up. Got there eventually.
Thank you very much.

By: Sara Santos

Sara Santos — Sun, 04 Dec 2022 21:35:06 +0000

In reply to Krish Naidoo. Please provide more details about the error.

By: Krish Naidoo

Krish Naidoo — Sun, 04 Dec 2022 19:27:26 +0000

In reply to Rui Santos. Hello Rui I have tried adding declaring more outputs and buttons and have not been successful. The modified code verified and uploads without errors but the browser does connect after doing this.

By: Claudio

Claudio — Tue, 08 Nov 2022 08:52:57 +0000

Hi Sara,
I want to add a physical switch near the Arduino to activate the relay.
How can I implement this on the sketch ?
Thanks
Claudio