12
votes
How to get HTTPS on Arduino?
(Disclaimer: I'm actually the author of the evothings.com article)
The Arduino UNO is more than capable at doing TLS. I've just finished up a blog post series on the topic. I have a working example of ...
- 121
7
votes
Accepted
WizNet W5100 not connecting to modern switches and routers
I think your problem is due to the MAC address that is being loading into the W5100. Try setting the 2 low order bits of the first byte to 0.
These bits define whether the MAC address is unicast or ...
- 86
5
votes
Accepted
Is the arduino hackable when using communication shields?
You should be pretty safe, at least as long as your code handles the
incoming data properly.
When you upload a new sketch through USB, the USB-to-serial interface
uses the Arduino pins TX0, RX0 and ...
- 44.3k
5
votes
Accepted
if two arduinos are connected by I2C and one of them is using an ethernet shield, does that grant both of them access to the internet?
I2C does not automatically share resources between two connected devices. You would not be able to share an Internet connection from a Mega connected via I2C to another Mega which has an Ethernet ...
- 6,974
5
votes
Accepted
Using c_str() on String for IPAddress with NTPClient provides wrong values
The String object created as return from IPAddress.toString() as parameter to constructor of NtpClient is temporary. It contains the char array returned by c_str(). NTPClient doesn't copy the string, ...
- 18.2k
5
votes
Accepted
Remotely uploading code to an Arduino board over the internet
You can upload to your Arduino board over Ethernet if you flash it with a special bootloader named Ariadne.
You will need an Ethernet module or shield that uses the W5100, W5200, or W5500 Ethernet ...
- 4,248
4
votes
Arduino two Ethernet shields
The ENC28J60 Shields have a Chip-Select-Pin (CS) so you could select between the two shields with this.
I'm using the EN28j60 with the Ethercard library and I'm not sure if this could handle two ...
- 51
3
votes
Accepted
How to send information from a web-site to the arduino?
Yes of course!
First things first - Yes, it is possible to accomplish what you're thinking.
The idea is to create a server on the Ethernet Shield and open the webpage hosted by it on any device and ...
- 426
3
votes
Disconnect Ethernet Shield
You have correctly determined the root of the problem, both shields are trying to use the same pins. To work around this we need to know which pins are being used, and for what.
The Ethernet Shield ...
- 31
3
votes
Accepted
How to connect arduino with local network
To connect to a network you need a network interface. This could be an Ethernet interface, a Wifi interface or something that supports TCP/IP. The easiest way of doing this is with ether an Ethernet ...
- 5,637
3
votes
My Arduino Ethernet shield is not working
If your Arduino can not get an IP address, it could be because there is a problem with your code, your shield or your network.
There doesn't seem to be a problem with your code from a quick glance, ...
- 5,637
3
votes
is there a timeout for Ethernet.begin?
The default timeout is 1 minute for DHCP. There is also a response timeout, and in the library millis is used for timeouts. I don't know if there is a timeout for everything, but I suppose there is.
...
- 3,246
3
votes
Accepted
Arduino Ethernet Shield 2: How can I automatically determine the MAC Address?
No, the W5500 chip does not have a mac address. You can give it any mac address that you want. The router might not like some mac addresses though.
There are online mac address generators.
The ...
- 3,246
3
votes
Multiple SPI device
Some card reaaders (as well as display boards with built-in sd socket) use 10-kOhm resistors in series to the CS, DIN and CLK lines, to perform a cheap 5V to 3.3V level translation. This is really not ...
- 411
3
votes
Accepted
Is there an Arduino library that uses ARP to get list of connected devices on network?
ARP isn't generally used the way you described. Per the spec, to resolve an IP address into a MAC address, you broadcast an ARP request for the IP address, and receive a unicast response from the ...
- 1,553
3
votes
2 SPI devices conflict
I had the same problem with my SD card module.
I don't have too much knowledge about all details, but it is related that most SD card modules (the simple ones) do not have tri-state functionality, ...
- 13k
3
votes
Leading Zeroes on Arduino Ethernet MAC Address
Writing this in case someone in the future might be interested.
The values passed in the Ethernet library is correct. The last value, 0x01 must be 1 and is written correctly, 0x01 in the registers of ...
- 115
3
votes
How to make an arduino webserver over USB? without ethernet shield nor wifi chip
You cannot change what the Arduino's USB does. The USB is not provided by the ATMega2560, but by the USB to UART interface chip.
On a genuine Arduino that may be an ATMega16U2 which could be ...
- 106k
3
votes
Simple GET request is failing silently
I made it by using EthernetENC library, as suggested by @Juraj.
To install the library, simply use the library manager and search for EthernetENC.
For those in need, below is a working code
#include &...
- 61
3
votes
Arduino shield stacking issue
Both those boards use pin 10 for chip select by default. You will need to change that.
Probably the simplest one to change is the LoRa board. If you look at the WiKi page you link to it lists a set of ...
- 106k
3
votes
Arduino does not connect to MQTT local broker
The issue was coming from mosquitto local broker, which was being blocked by windows 10 firewall. When I executed mosquitto with the correct permissions on its folder (read and write for "all ...
- 141
2
votes
Is an Arduino capable of running 24/7?
Is an Arduino capable of running 24/7?
This is a reliability question. In reliability, there are a lots of things to consider.
The software. There are more robust softwares. There are less
robust ...
- 411
2
votes
Arduino Web Server: Receiving response from web form
Your form method is set to GET. In this case, when Submit is clicked, the client/browser sends request with values in URI:
GET /index.html?data=user_value&default_name_of_button=Submit HTTP/1.1
.....
- 529
2
votes
Ethernet shield not working
I found the solution in modrego's answer on Arduino Ethernet Shield 2 stuck on EthernetServer::begin(). I need the Ethernet2 library for the W5500 Ethernet controller. The Ethernet library is for ...
- 121
2
votes
W5100 Ethernet Shield to Custom Board Problem
A bit late to the party but... it may be that you are using pins 1, 2, 3 and 4 instead of 1, 2, 3 and 6 on the RJ45. It is unclear whether you are connecting via a header, in which case you my ...
- 21
2
votes
Accepted
Cannot run arduino as web client
This could be an SD card SPI bus issue.
Note that because the W5100 and SD card share the SPI bus, only one can be active at a time. If you are
using both peripherals in your program, this should be ...
- 144
2
votes
Why doesn't the Ethernet W5100 shield work on Gigabit switch?
The fix for this is to solder a 120 Ohm resistor between pins 1-2 and 3-6 of the RJ45 socket (where pin 1 is closest to the left side of the socket when looking at the top of the board. (Credit to ...
- 21
2
votes
Accepted
Arduino Disconnects after router password changes
Routers have multiple "passwords". I assume you are talking about your wireless encryption key (i.e. WPA/WPA2 key). When the encryption key is changed, you are correct: you have to re-program the ...
- 254
2
votes
Accepted
Where can I find a better pinout diagram for "Arduino Ethernet" board?
That's a better one from :
https://pinoutguide.com/images/arduino/ethernet.png
This one also presents the Arduino Ethernet R3 board and
has the extra I2C pins (SCK=A5,SDA=A4) next to the AREF pin.
- 34
2
votes
POE with Arduino Leonardo Eth
From the arduino.cc website.
"The optional PoE module is designed to extract power from a conventional twisted pair Category 5 Ethernet cable. PoE module features are as follows: IEEE802.3af ...
- 21
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