Hey guys i made a shematic how i will wire up arduino, 8 Chanell Relay.... now i want to ask is possible to wire positive and negative on same reay and switch for up and down ?
Thanks
The easy way is to use a double-pole double-throw (DPDT) relay to reverse the power connections (select direction) and another relay to turn the power on and off.
Your relay board is likely to have only single-pole relays.
The DPDT relay boards I found on eBay are "signal" relays. Their contacts are only good for 1 or 2 Amps.
I think your best bet is to use one of your SPST relays to switch power to a DPDT power relay.
Hey guys i made a shematic how i will wire up arduino, 8 Chanell Relay.... now i want to ask is possible to wire positive and negative on same reay and switch for up and down ?
You should be able to use two of the relays on your board like below to operate a single motor.
Automotive window regulator motors will require a significant amount of current to run the window up or down. The amount of current will increase GREATLY when the window reaches top or bottom and the motor stalls. You might want to consider that. - Scotty
Yes i want to experiment with
Arduino Mega
16 Chanell Relays
2 Car window motors
So how then i must connect from 16 Chanell relays to window motors for up and down with SPDT relays on ? Can anyone plaese made shematic like i do ? And yes when window will be fully closed then voltage will be incresed then i will made the code when voltae is bigger then 12v then arduino stop relay 
THANKS...
bizjak:
So how then i must connect from 16 Chanell relays to window motors for up and down with SPDT relays on ?
See reply #2
And yes when window will be fully closed then voltage will be incresed then i will made the code when voltae is bigger then 12v then arduino stop relay
The current, not the voltage will increase. - Scotty