Guess I'd be surprised if the LED string could receive data without being powered on. Maybe that's not what you're saying.
Hi, you say the LED strip is custom made, can you show us a diagram of the circuitry in the strip so we can see what we are working with.
There must be some digital circuitry, do you have control of individual LEDs when you control it. If you can control individual LEDs then there must be more than just drivers on the strip.
By the way have you tried bypassing the supply pins of the LED strip by putting say 10uF electrolytic capacitor between positive and negative at the LED strip connector.
Again can I ask you to measure the voltage at pins 3 and 4 of the relay and see if the drop really is the relays fault.
Also, do you have access to an oscilloscope, look at the supply voltage going into the strip and see if there is any noise when using the relay.[/qoute]Nope.Quote from: TomGeorge on Aug 03, 2013, 01:51 pmYou have used this strip before, what did you use then to switch supply, why change?An on/off switch that powered them from a computer PSU. However this is a different design running of off a battery. Because of the amount of amps the LEDs will be pulling, I would need a rather large switch for which I do not have the physical space for. So using a relay or MOSFET to switch the higher current side of the unit is the only solution here: I'll use a small ON-OFF-ON switch to power the unit in different configurations. First ON turns the MCU on so I can work with it while connected to a computer without needing the LEDs on as well. Second ON will have both the MCU as well as the LEDs on. Ideally I would have used an OFF-ON-ON, however I have not been successful in finding one that will work for this project.
You have used this strip before, what did you use then to switch supply, why change?
Quick question, how can I reverse the attached schematic so that I'm cutting off VCC, and not GND. I don't want the connector (which goes to an LED string) to have live VCC on it as that could potentially cause problems.
It will put the full battery power onto the strips which have a ground plane on one side and VCC plane on the other side.
So how would I do that?