Hi all,
I am currently struggling with my Arduino Setup(Arduino Uno R3 with w5100 Ethernet shield mounted).
I use the Arduino to control WS2811 Led Strips via Artnet (Adafruit library with the excellent code from GitHub - natcl/Artnet: An Art-Net library for Teensy, Arduino and ESP boards)
I recently bought an LCD and an I2C Module to output the IP-adress of the Art-Net Node.
Everything works fine when I run the devices separately, e.g. the Artnet output works without the LCD connected and the LCD works without the Ethernet-shield being connected.
The problem occurs when I connect the SCL and SDA-leads from the LCD to the Pins on the Ethernet-Shield. The Node just freezes(LEDs stop refreshing) and so does the Uno.
What am i doing wrong? I checked the manual from the ethernet shield, and it does not seem to use the A4 & A5 pins or am I mistaken?
Any help would be greatly appreciated 
Kind Regards,
Maikel
Could you post a link or schematic of the LCD and I2C module?
The ethernet shield doesn't use A4 or A5, but maybe there is a different issue...
Thanks for the reply!
The Display is a HD44780 1602 LCD Module (Link:http://www.amazon.de/HD44780-Module-Display-Anzeigen-Zeichen/dp/B009GEPZRE/ref=sr_1_1?s=ce-de&ie=UTF8&qid=1432808701&sr=1-1&keywords=HD44780)
The I2C-Module is a I2C Adapter Serial Interface Board (Link: http://www.ebay.de/itm/221717504003?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT)
I am wondering if the Uno does not have sufficient SRAM to handle the load.
When I compile the code 57% of dynamic storage is being used...
Any thoughts?
As a tip, next time posts the links as real links with the "links" button... i hate copy-pasting for other people...
And 57% isn't bad... I run programs into the 95%'s and they run for ages...
Can you post your code perhaps? I'm getting the feeling where looking in the wrong direction. The 2 should work together... (Post your code by selecting the "</>" button please!)
Sorry about the links.. I'm thought they would be transformed automatically, won't happen again.
The code ist fromhttps://github.com/natcl/Artnet and I added the Liquidcrystal-I2C-library from here: http://hmario.home.xs4all.nl/arduino/LiquidCrystal_I2C/
Here's my *.ino file
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Artnet.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <SPI.h>
#include <Adafruit_NeoPixel.h>
// Neopixel settings
const int numLeds = 100; // change for your setup
const int numberOfChannels = numLeds * 3; // Total number of channels you want to receive (1 led = 3 channels)
const byte dataPin = 7;
Adafruit_NeoPixel leds = Adafruit_NeoPixel(numLeds, dataPin, NEO_RGB + NEO_KHZ800);
// Artnet settings
Artnet artnet;
const int startUniverse = 0; // CHANGE FOR YOUR SETUP most software this is 1, some software send out artnet first universe as 0.
// Check if we got all universes
const int maxUniverses = numberOfChannels / 512 + ((numberOfChannels % 512) ? 1 : 0);
bool universesReceived[maxUniverses];
bool sendFrame = 1;
int previousDataLength = 0;
// Change ip and mac address for your setup
byte ip[] = {192, 168, 2, 5};
byte mac[] = {0x04, 0xE9, 0xE5, 0x00, 0x66, 0xEC};
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x20 for a 16 chars and 2 line display
void setup()
{
lcd.begin(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.print("Starting");
lcd.print(".");
delay(1000);
lcd.print(".");
delay(1000);
lcd.print(".");
delay(1000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Panel-Adress:");
lcd.setCursor(0,1);
lcd.print("192.168.2.2");
//Serial.begin(115200);
artnet.begin(mac, ip);
leds.begin();
initTest();
// this will be called for each packet received
artnet.setArtDmxCallback(onDmxFrame);
}
void loop()
{
// we call the read function inside the loop
artnet.read();
}
void onDmxFrame(uint16_t universe, uint16_t length, uint8_t sequence, uint8_t* data)
{
sendFrame = 1;
// set brightness of the whole strip
if (universe == 15)
{
leds.setBrightness(data[0]);
leds.show();
}
// Store which universe has got in
if (universe < maxUniverses)
universesReceived[universe] = 1;
for (int i = 0 ; i < maxUniverses ; i++)
{
if (universesReceived[i] == 0)
{
//Serial.println("Broke");
sendFrame = 0;
break;
}
}
// read universe and put into the right part of the display buffer
for (int i = 0; i < length / 3; i++)
{
int led = i + (universe - startUniverse) * (previousDataLength / 3);
if (led < numLeds)
leds.setPixelColor(led, data[i * 3], data[i * 3 + 1], data[i * 3 + 2]);
}
previousDataLength = length;
if (sendFrame)
{
leds.show();
// Reset universeReceived to 0
memset(universesReceived, 0, maxUniverses);
}
}
void initTest()
{
for (int i = 0 ; i < numLeds ; i++)
leds.setPixelColor(i, 127, 0, 0);
leds.show();
delay(500);
for (int i = 0 ; i < numLeds ; i++)
leds.setPixelColor(i, 0, 127, 0);
leds.show();
delay(500);
for (int i = 0 ; i < numLeds ; i++)
leds.setPixelColor(i, 0, 0, 127);
leds.show();
delay(500);
for (int i = 0 ; i < numLeds ; i++)
leds.setPixelColor(i, 0, 0, 0);
leds.show();
}
So i ordered an Arduino Mega to check if it was due to the lack of ressources. Unfortunately the problem still persists.. Any ideas?
Kind Regards,
Maikel
Hallo, I have the same probleme, Have you solved in some way?