Bluetooth Joystick control for RC Car

thingiverse

This is a Bluetooth remote control for RC Car, perfect for when you can't or don't want to use your phone to control it. The word "Chamuscado" on top of the cover is my car's name, which means scorched in Spanish - I like keeping things simple. NO PRINTED COMPONENTS: In order to build this, I used the following components inside the printed control: - Bluetooth HC-05 (configured as Master) - Arduino Nano - Arduino Joystick - Battery holder for 4 AA batteries, each 1.5V - A small switch to turn On/Off - 4 screws with a diameter of 3mm - Wires with a diameter of 1mm - Dupont terminals CONNECTION SCHEME: Attached as an image to this project. BLUETOOTH CONFIGURATION: To establish communication between the car and joystick, Bluetooth must be configured as master for the joystick and slave for the car. Here's how you can do it: First, prepare a circuit like the one attached in the image to connect a Bluetooth and modify its configuration. Next, upload the BTConfig.ino code to the Arduino to start modifications (remember to upload without connecting the Bluetooth yet to avoid an error). Then, connect the Bluetooth to the circuit and open "Monitor Serie" while pressing the Bluetooth button to force it into configuration mode. After that, set "Both NL & CR" in the dropdown menu and choose the accurate baudrate, usually 9600 or 38400. For the Slave Bluetooth, type the following commands: * AT - returns Ok, so you know the Bluetooth is connected * AT+NAME = <Name> - sets a new name for your Bluetooth (optional) * AT+PSWD=<Password> - sets a new password for your Bluetooth (optional) * AT+UART=9600,0,0 - sets communication speed * AT+ROLE=0 - sets the Bluetooth as Slave * AT+ADDR? - returns the MAC address of the Bluetooth. For example, 98d3:31:2052e6. Copy yours and keep it to configure the master one. * AT+RESET For the Master Bluetooth, type: * AT - returns Ok, so you know the Bluetooth is connected * AT+NAME = <Name> - sets a new name for your Bluetooth (optional) * AT+PSWD=<Password> - sets a new password for your Bluetooth (optional). Must be the same as the slave Bluetooth. * AT+UART=9600,0,0 - sets communication speed * AT+ROLE=1 - sets the Bluetooth as Master * AT+CMODE=0 - makes the master Bluetooth connect only to a specific address. * AT+BIND=<Mac Address> - sets the address where to connect. Use the MAC address from the slave Bluetooth in the following format with commas: 98d3,31,2052e6. * AT+RESET If you need to restart configuration to start from scratch, use AT+ORGL. Once both Bluetooths are configured and powered on, they should blink twice every two seconds at the same time, indicating that they're connected. ARDUINO CODE TO BE UPLOADED - For the joystick: attached as Mando_rc_bluetooth.ino. - For the RC-Car: attached as car.ino. - Library to be added to project to compile car rc code as AFMotor.zip. (Don't upload the code with the Bluetooth connected to Arduino or you'll get an error).