Thursday, June 30, 2016
Tuesday, June 21, 2016
Power a Raspberry Pi with PoE (various DIY solutions)
Pop a hat on your Raspberry Pi to power it over Ethernet (May. 27, 2015):
Discount code: E5OFF
POE Splitter kit (with long cables) for Raspberry Pi:
TP-LINK 8-Port Gigabit Ethernet PoE Desktop Switch with 4 PoE Ports (TL-SG1008P):
TP-LINK 8-Port Fast Ethernet PoE Desktop Switch with 4 PoE Ports (TL-SF1008P):
TRENDnet TPE-TG50g 5-Port Gigabit PoE+ Switch:
4 port POE power over ethernet injector for IP Camera, Access Points:
"Can't beat the price. This little gem works great to supply Power Over Ethernet to my Escam Brick QD300 IP cameras.
I powered it with 48VDC and used an iCreatin Active 12V PoE power over Ethernet Splitter Adapter on the device end.
This allowed me to provide 48VDC over the Ethernet cable and then regulate it down to 12VDC at the device... This allows for much longer cable runs due to less voltage drop. The 4 Port POE injector has a jack that was just the right size for the 48VDC CISCO power supply I had laying around. Power can also be supplied using the screw terminals or you could use these terminals to "daisy chain" to another injector module."
WS-POE-8-48v60w Passive 10/100 Power over Ethernet PoE Injector for 8 IP Cameras, VOIP Phones or Access Points, 48 volts, 60 Watts Total Power:
• power 8 Cameras, WiFi AP's or IP Phones with 60 watts total power
• power any 802.3af device - any 12v,PoE device (see video for info)
• Wall mount version
• 8 data in, 8 data + PoE out
• this is not a switch - you use it to add PoE to any switch or router
• extend power to 328 ft or 100 meters
• power is on all the time. 2.1mm DC connector
Power Supply Included
• 48 volts DC, 1.25 amps, 60 watts
• 110 to 220 volt AC operation
"802.3af and 802.3at PoE devices have internal voltage regulators. They may require 12v when using a DC power adapter. But, if they're powered using a PoE switch or mid-span PoE injector, they receive a higher voltage (usually 48v) on the Category cable, then step the voltage down internally to whatever is needed. 802.3xx PoE technology allows each device manufacturer to design their equipment as they need, simply taking the "bus" voltage then dropping it using an internal voltage regulator. The supply side of the circuit sends a constant voltage, independent of the component or its needs."
"This device is the 10/100 version - since two pairs are used for data, and 2 pairs for power. There are Gigabit versions "WS-GPOE" that use transformers to share power and data - so all 4 pairs are active and gigabit rates are supported "
PiPoE - powering a Raspberry Pi over Ethernet:
The project uses these components:
A DC power supply - any voltage between 12V and 24V, regulated or unregulated, will do. In my tests, powering a Raspberry Pi used under 200mA at 15V, so make sure the supply is rated at least 250mA (at 15V) or 300mA (at 12V) for each Pi you will be powering.
A passive PoE injector box. The one in the pictures was £7 on Amazon for a 4-port one - many other types are available.
A short length of CAT5 cable with a RJ45 plug attached. (I cut the end off a short Ethernet patch lead where the plug on the other end had broken).
A DC-DC step down converter module. (Search for 'LM2596' on Amazon or eBay - the one shown in the pictures was about £2).
A PCB-mounting RJ45 socket.
A two-pin 0.1" pitch socket (for a Raspberry Pi), or DC jack plug (for Beaglebone)
A small piece of prototyping pad board. (Note this has to be pad board not strip board).
Wire, cable ties
A DIY PoE solution:
Spare wires Power over Ethernet (POE) Injector and Splitter adaptors:
How do I modify my Raspberry Pi to be powered over PoE?
DC Power Over Ethernet (Injector Adapter) For: Router, AP, Switch, Hub:
Monday, June 20, 2016
Sunday, June 12, 2016
Wednesday, June 8, 2016
Monday, June 6, 2016
Friday, June 3, 2016
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