Hi Isaac,
Connect an RF transmitter (PIC + 10mW TX module) to the brake lights of
the trailer so when the brakes are activated the data is sent to
the receiver located inside the cab. (PIC + RX module).
Example RF modules:
http://www.crownhill.co.uk/product.php?prod=435
http://www.rentron.com/PicBasic/RemoteControl.htm
Best regards,
Luciano
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