Velleman projects K3502 Assembly instructions - Manual (Page 12)

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Connect the receiver to the base print.
Connect the terminal GND of the base print to the - of the car (chassis)
Connect the terminal ‘+’ of the base print to the ‘+’ of the reverse light.
5. DEFINITIVE CONNECTION
Connection & use
The circuit is activated as soon as the gear is shifted in reverse (this is marked by a 'bip' tone) and will detect
any obstacle within the range of the sensors, the detection distance (i.e. the sensitivity) being adjusted by
means of the trimmer RV1. A distance of approx. 25 to 30cm from the backside of the car seems to be a
value of practical use. First of all make some tests with the help of a second person who can survey the
distance from the outside (in order to avoid damaging the coach-work).
In case the buzzer cannot be heard clear enough, you can bring it closer to the driver by means of a 2
conductor extension cord.
REMARK : Be carefully when washing the car that no water is getting into the receiver (eventually you
should cover the sensors by means of adhesive tape).
6. USE