With this project I want to show you the way on how to convert an RC car into an Auto Controlled car with Arduino Uno R3.
Step 1: Required Materials:
RC car (with separated back wheel motors)
Arduino Uno R3
Ultra Sonic sensor HC-SR04
Step 2: Connecting RC Car H-BRIDGE With Arduino
I opened the car and found the pcb which is controlling the two motors. I identified the points that are responsible for the four motor movements (Left motor front, Left motor back, Right motor front, Right motor back) and soldered four wires. Then I connected them at the pins 9, 10, 11, 12 of the Arduino board as shown in the picture.Last but not least, I connected the GND of the H-BRIDGE to the GND of the Arduino board.
Step 3: Connecting Ultra Sonic Sensor to Arduino
Then I connected the Ultra Sonic sensor with the Arduino board like this:
VCC pin to pin 5V of the Arduino board,
GND pin to GND pin of the Arduino board,
Trig pin to pin 8 of the Arduino board and
Echo pin to pin 7 of the Arduino board.
Step 4: Power Connections
To power the Arduino I joined it with a 9V battery to the dc jack and because I didn't want to waste the battery's power I cut the Volt wire and soldered an On/Off switch. Then to make it more stylish I made a hole at the car with the electric drill at the size of the switch and put it in there.
Step 5: Sketch
Now you can find the attached sketch that I made.