Patent ID: 7609149

Claim:
A reverse radar with vehicle approaching alarm comprising a main body and sensors mounted on a vehicle, in which the main body comprises a CPU circuit, an operational amplifier circuit, a switching circuit, a sensor interface circuit connected to the sensors, a detecting circuit wherein the detecting circuit is a brake pedal, reverse gear and power on detecting circuit, and a power source, and the input terminals of the CPU circuit are connected to the output terminals of the operational amplifier circuit, the detecting circuit and the power source, and the output terminal of the CPU circuit is connected to the input terminal of the switching circuit, and the input terminal of the operational amplifier circuit is connected to the output terminal of the switching circuit, and the switching circuit and the sensor interface circuit are interconnected, and the output terminals of the power source are connected to the input terminals of the switching circuit and the sensor interface circuit, characterized in that the main body further comprises an alarming source which gives a warning signal when at least one sensor detects another vehicle approaches and a controlling circuit which controls the alarming source responsive to the at least one sensor, and the controlling circuit is connected to the output terminal of the CPU circuit and the power source.