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Step 9Integrate
Now you can put the LEDs on the wall, connect the power supply and any control electronics and turn it on. Depending on your design this could take a second or hours. If you use the techniques described, your LEDs can be reconfigured along the piece (as in the case of the outdoor electro-graf) or LEDs can be replaced and colors changed (as in the case of the indoor electro-graf stencil).
In some cases you will need to add a resistor directly to the LED cahthode lead. This will help prevent the LED from drawing too much current and getting damage and reduce the voltage drop that occurs in a parallel circuit due to LEDs that are not current limited. To determine you resistor value use the following easy formula.
(SupplyVoltage - LEDForwardVoltage)/ NominalLEDCurrent = ResitorValue
In the case of the outdoor electro-graf we used the following values:
(12 VDC - 3VDC)/.020 mA = 450 Ohm resistor
The main design driver for the magnetic paint and magnet mod-ed electronics was ease of integration. This step should be relatively easy.
In some cases you will need to add a resistor directly to the LED cahthode lead. This will help prevent the LED from drawing too much current and getting damage and reduce the voltage drop that occurs in a parallel circuit due to LEDs that are not current limited. To determine you resistor value use the following easy formula.
(SupplyVoltage - LEDForwardVoltage)/ NominalLEDCurrent = ResitorValue
In the case of the outdoor electro-graf we used the following values:
(12 VDC - 3VDC)/.020 mA = 450 Ohm resistor
The main design driver for the magnetic paint and magnet mod-ed electronics was ease of integration. This step should be relatively easy.
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