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Topic: Powering 4 Relays  (Read 59 times) previous topic - next topic

Hello guys, im working on a jet engine right now. Im building a system that will automatically start the engine. Yesterday i built the system, and the relay board, but realized.. The arduino can close one relay, but when the other 3 turn on, it kills the board because they are pulling so much current. Then i supposed i could use transistors to switch the outputs, i could possibly power the relays through the 5v pin, but i need transistors to switch the on off action of the digital outs. So the relays are 5v and more current than the output pins support, but the 5v pin could possibly work. I need pins 13-6, and higher current for my relays. Is there any other way to increase the amperage without switching out relays?

All relays act as a switch for the startup process.
Relay 1- oil pump on
Relay 2- fuel pump on
Relay 3- motor to spin the turbine on
Relay 4- igniter on.
After all turn on, it counts to 90 seconds
Now the motor and igniter turn off. And the oil pump and fuel pump resume normal operations. Is there another board i could possibly use?

cr0sh

http://en.wikipedia.org/wiki/ULN2003A
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

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