Ultrasonic Car Parking Assist

[carp3]

Hi,
I want to build a parking assist for my car.
which way do you recommend ?
i have 2 Ultrasonic transducer (40khz)

1. Sensor->Analog switch->Amp->Band Pass Filter->Envelope detector->Voltage Comparator(eg LM324)-> uC EXT INT line.

or

2. Sensor->Analog Switch->Amp->ADC(@2msps)-> uC@72MHz(CortexM3)->FFT/FIR ...



My Sensor:
https://cosson.en.alibaba.com/product/575318050-211877940/Ultrasonic_Sensor_parking_sensor.html

uC:
STM32F103CBT6

 

[bhav]

First approach looks practical

 

[carp3]

Any reason why?

 

[bhav]

the first approach is mostly hardware implementation so would be a bit difficult to implement while adjusting the parameters

In second approach processing is done within controller through software codes

So it depends on your expertise and implementation strategy for which to choose

 

[newtonoid]

I've been playing around with some Arduinos I got over the christmas break and threw together a backup assistant. The prototype in this video uses just one sensor, but I plan to put a few of them in parallel to widen the vision angle.

Here's how I was thinking I'd power the sensor:



The receiver would be powered with a simple cigarette lighter, regulated to nine volts, and the vibration motor(s) would be installed in my car seat. I'm speaking in the second conditional here, because I may end up ripping these apart and using the arduinos for something else. They're so fun!