Infrared reversing radar copy

The infrared reversing radar circuit consists of a multi-vibrator circuit, an infrared transmitting and receiving circuit, a signal amplification and voltage comparison circuit and

LED display circuit composition. The circuit is simple, low cost, stable, and widely used. Note when installing: Infrared emission

The long pin of the HJ tube of the HF tube and the infrared receiving tube is the positive pole, and cannot be plugged in incorrectly. The installation direction can be either upward or sideways. RP1

Adjust the reflection distance, and RP2 adjusts the sensitivity. It is recommended to realize that LED3 lights up at 30CM through adjustment: LED2 and LED3 both light up at 20CM: 10

During CM, all three LEDs are on. Brief circuit analysis: NE555 and peripheral components form a multivibrator circuit to generate driving infrared rays

The oscillating voltage of the transmitter tube drives the transmitter tube to emit infrared signals. After the infrared ray is reflected back by the object, the infrared ray

The receiving tube receives and sends it to the second pin of LM324 for amplification. The amplified signal is output through the first pin of U2, coupled by C3, D1 and C2

After rectification and filtering, it is sent to the inverting input terminals of the three comparators of U2, and is compared with the voltages of the non-inverting input terminals of the three comparators respectively.

When the voltage at the inverting input terminal is higher than the voltage at the non-inverting input terminal, the comparator outputs a low level, causing the light-emitting diode connected to it to

Light up. The distance is indicated by the number of light-emitting diodes that light up.