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Radar Function using Ultrasonic
for addition object detection a simple function can be added using widely available SR04 Ultrasonic with PWM output to interrupt the vehicle at a set distance , this uses the SR04 Ultrasonic with ideal range of 2m and max 5m but because ultrasonic has a wider sensor arc its resolution is arbitrary at best and mainly use as low cost obstacle trigger detection.
![](http://synerflight.com/wp-content/uploads/2023/08/ultrasonic.jpg)
![](http://synerflight.com/wp-content/uploads/2022/01/image-2.png)
![](http://synerflight.com/wp-content/uploads/2023/08/variable-trigger-sonar-5m.png)
Setting up the Bluetooth telemetry
Bluetooth setup with the USB TTL and Arduino IDE
Arduino IDE>Tools>Serial Monitor (hold the Button while Plugging the USB) to go programming mode Set (Baud 38400) (Both NL & CR)
Hold Press when sending AT command (Version 5)
AT : check the connection
AT+VERSION : Check Version
HC-05 (Recommended)
AT+NAME=Change name (Synerduino)
AT+PSWD=1234 (Version 2)
AT+PSWD=“1234” (Version 3) (Possibly works on Version 5)
AT+UART=57600,1,0 (for synerduino Radar)
Download Ultrasonic Radar Application
Note: is available in EXE and PDE formats – to use PDE format download the Processing Application form Processing.org
Firmware Hex file and Hex uploader
supports 328P boards Nano and Promini
Arduino/Processing.org sketch notes
change this value to change distance trigger
/set Distance to trigger the PWM Aux Switch in cm/ eg: 100cm
int inputdistance = 100; // set Distance to trigger the PWM Aux Switch in cm (change this to adjust trigger distance)