Relay driver question

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hey had made own relay board. relays, need use 74hc595 along uln2803. hav taken 3 pins arduino 74hc595 n taking output uln have vcc-12v . uln output, relay pins connected. relay board common vcc. when give power supply , relays trip in program hav low registers. please me figure out. n need overview on programming.

hi
welcome forum.

can please post copy of circuit, in cad or picture of hand drawn circuit in jpg, png?

can please post copy of sketch, using code tags?
they made  </> icon in reply menu.
see section 7 http://forum.arduino.cc/index.php/topic,148850.0.html

have got gnd connections joined together?

tom... :)


Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Relay driver question


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