Freetronics Ethernet Shield With PoE
Put Your Arduino Online With The Freetronics Ethernet Shield And Have It Talk To The World. Native Power-Over-Ethernet (PoE) Support.
Do Twitter updates automatically, serve web pages, connect to web services, display sensor data online, and control devices using a web browser. The Freetronics Ethernet Shield is based on the same Wiznet W5100 chip used by the official Arduino Ethernet Shield, and is 100% compatible with the Ethernet library and sketches.
Run Only One Cable Using Power-over-Ethernet.*
The big news is PoE (Power-over-Ethernet) support, which means that at last you'll be able to plug your Arduino into an Ethernet network and have it fire up right away with no direct power connection. Brilliant! But it gets even better. We've brought the PoE connections out to a header on the shield, which gives you the flexibility to use it in different ways to suit your own requirements:
Many Choices For PoE. Goes Great With Our4-Port PoE Midspan Injector.
1. Put a couple of jumpers across the headers and feed about 12Vdc down the Ethernet cable for a dirt-cheap DIY solution. Perfect for use with our 4-Port PoE Midspan Injector.
2. Use our low-cost PoE Voltage Regulator 24V daughterboard that plugs in and lets you feed up to 24Vdc down the Ethernet cable. Compatible with many low-voltage commercial PoE systems and third-party midspan injectors, including our own 4-Port PoE Midspan Injector.
3. Fit an 802.3af-compliant daughterboard (available soon from Freetronics) that negotiates a connection with commercial 48V PoE switches and allows you to run your Arduino and Ethernet Shield on full-power PoE networks.
Get Right To It With The Large Prototyping Area.
What's the point of connecting your Arduino to a network and not having any space to put on other parts, such as sensor connections or control outputs?
So we crammed all the Ethernet circuitry up to one end of the shield, leaving fully half the shield available as a general-purpose prototyping area. Now you don't have to stack a prototyping shield on top of an Ethernet shield!
Combining Ethernet with other SPI devices can be really tricky because the Wiznet chip doesn't relinquish the bus properly when it's deselected. To fix that problem we slaved the Wiznet's SEN (SPI Enable) line to the CS (Chip Select) line, which means that whenever your sketch deselects the Ethernet connection in order to talk to another SPI device it will work exactly the way it should.
No more messing around with cutting tracks and other nasty hacks you may have seen mentioned on the forums.
1. We've also slaved the Ethernet Shield's reset line to the Arduino reset line, so if your Arduino is reset the Ethernet Shield will automatically reset as well.
1. Shield Reset Pad- If you look near the top left of the shield (to the right of the Wiznet chip) you'll see a pad labelled "WIZ RST". You can connect a digital pin to that using a jumper so you can forcibly reset the Wiznet chip. The good thing is that we used a diode to couple the Arduino reset and the Wiznet reset, which means you don't even need to [bend out the reset pin]. You can assert Wiznet reset using that pad without also resetting the Arduino.
[bend out the reset pin]: http://community.pachube.com/arduino/ethernet/watchdog
Power Filtering Fixes
Ethernet connections are very susceptible to electrical noise, so the Wiznet chip has multiple ground pins on two separate buses and they need to be individually decoupled and the buses linked by an inductor. We took care of that by implementing proper decoupling on the power and ground rails, ensuring you get maximum reliability even in electrically noisy environments.
The Freetronics EthernetShield Is Stacked With Features.
But that's not all. Other features of the Freetronics Ethernet Shield include:
- Auto-sensing 10/100base-T connection.
- Gold plated PCB.
- Connection overlay on both the top and the bottom so it's easy to see what you're connecting.
- All Arduino headers brought out beside the prototyping area for maximum convenience.
- LED status indicators for TX, RX, collision, duplex, 10/100, and link.
- Stackable headers so you can put another shield on top.
- Sexy rounded corners.