NA v1.1.4

Node Assassin :: NA v1.1.4

This version of the Node Assassin hardware implements an independent sense circuit which is to be fed from the nodes power LED line. This is used to verify when a node truly has died. This brings Node Assassin to fully support all of the fence daemon's recommended features.

Part List

• 1x Arduino: Duemilanova
• 1x Network Shield: Assembled
• 1x Protoboard: Lab-Easy PADS-4 (or equivalent)
• 3x Optoisolators: LTV-846 (4 circuits/chip)
• 1x Inverter: 74HC540 (8-channel high-power; drives 8x 10mA LED)
• 1x Buffer: 74HC541 (8-channel high-power; drives 8x 10mA LED)
• 1x OR-Gate: 74HC32 (Quad OR Gate)
• 8x Diode: 1N4148 (Diode)

Either:

• 4x Green LEDs (max 10mA)
• 4x Red LEDs (max 10mA)

OR (harder to find)

• 4x Bicolour LEDs: 350-1839-ND (Bicolour Red/Green, 2x1 stack, common cathode, max 10mA/colour)

Diagrams

Circuit

Circuit diagram for the four-port Node Assassin v1.1.4.

PADS-4 Layout

This is an "in progress" view of the board. Final layout and wiring are still needed.

Board Layout preview using the PADS-4 prototyping board. Wiring and final layout still to come.

 

Input, advice, complaints and meanderings all welcome!
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