# Motor Rotation Based on Joystick Counting
This Python code demonstrates a joystick-controlled motor rotation system that enables a user to count joystick inputs and control the motor's rotations accordingly. The application uses a **USB-connected motor controller** to read joystick inputs and perform precise motor movements based on the input count. Below is a step-by-step explanation of the code.
**About Tools and Materials:**
[SMD Red](https://docs.acrome.net/electronics/smd-red) ([Purchase Here](https://www.robotshop.com/products/acrome-smd-red-smart-brushed-motor-driver-with-speed-position-and-current-control-modes))
[SMD USB Gateway](https://docs.acrome.net/electronics/gateway-modules/usb-gateway-module) ([Purchase Here](https://www.robotshop.com/products/acrome-usb-gateway-module-acrome-smd-products))
[Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module) ([Purchase Here](https://www.robotshop.com/products/acrome-joystick-2-axis-add-on-module-acrome-smd-products))
[BDC Motor](https://docs.acrome.net/electronics/electrical-motors/brushed-dc-motors-bdc) ([Purchase Here](https://www.robotshop.com/products/acrome-12v-brushed-dc-motor-with-built-in-encoder-100-rpm-speed))
## **Step 1: Hardware & Software Overview**
**Key Components:**
1. [ACROME SMD](https://docs.acrome.net/electronics/smd-red)\
The [ACROME SMD](https://docs.acrome.net/electronics/smd-red) acts as the communication hub between the [Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module) and the computer. It collects [Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module) data, processes user input, and translates it into mouse movements and clicks.
2. [Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module)\
The [Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module) serves as the main input device. The user can move the [Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module) to control the mouse pointer’s X and Y coordinates on the screen. Additionally, the [Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module) button can be used to trigger mouse clicks.
3. [BDC Motor](https://docs.acrome.net/electronics/electrical-motors/brushed-dc-motors-bdc) \
The motor is controlled using velocity commands, allowing for smooth acceleration and deceleration.
#### **Project Features:**
* **Button Press Detection**: Reads the joystick button state from the motor controller.
* **Entering Counting Mode**: Holding the button for 5 seconds activates counting mode.
* **Incrementing the Counter**: In counting mode, pressing and releasing the button increases the counter.
* **Triggering Motor Rotation**: Holding the button for another 5 seconds rotates the motor according to the counter value.
## **Step 2: Assemble**
**Getting Started**
1. **Hardware Setup**
* Connect the SMD to the PC or Arduino board using [USB Gateway Module](https://docs.acrome.net/electronics/gateway-modules/usb-gateway-module) .
* Connect the [BDC Motor](https://docs.acrome.net/electronics/electrical-motors/brushed-dc-motors-bdc) and the [Joystick Module](https://docs.acrome.net/electronics/add-on-modules/joystick-module) to the SMD using an RJ-45 cable.
* Make sure that the SMD is powered and all connections are correct
#### **Project Wiring Diagram**
## Step 3: Run & Test
#### Run the Script
• Execute the script to initiate the Motor Rotation Based on Joystick Counting project.
• The script will automatically detect the USB port and establish communication with the SMD Master Controller.
• Move the joystick to control the motor’s rotation and observe the response.
#### Experience Joystick-Based Motor Control
• Move the joystick forward to rotate the motor clockwise (CW).
• Move the joystick backward to rotate the motor counterclockwise (CCW).
• Return the joystick to the center position to stop the motor.
• Observe how the motor speed and direction change dynamically based on joystick movement.
## Codes
{% tabs %}
{% tab title="Python Code" %}
{% code lineNumbers="true" %}
```python
from smd.red import Master, Red
import time
from serial.tools.list_ports import comports
from platform import system
# Detect USB Port
def detect_usb_port():
ports = list(comports())
usb_names = {
"Windows": ["USB Serial Port"],
"Linux": ["/dev/ttyUSB"],
"Darwin": ["/dev/tty.usbserial", "/dev/tty.usbmodem", "/dev/cu.usbserial"]
}
os_name = system()
for port in ports:
if any(name in port.device or name in port.description for name in usb_names.get(os_name, [])):
return port.device
return None
# Initialize SMD Red Connection
serial_port = detect_usb_port()
if not serial_port:
print("No compatible USB port found.")
exit(1)
master = Master(serial_port)
motor_id = 0
joystick_id = 5 # Joystick module ID
master.attach(Red(motor_id))
master.set_operation_mode(motor_id, 0) # Set motor to PWM mode
master.enable_torque(motor_id, True)
# Control Motor with Joystick
def control_motor():
while True:
joystick_data = master.get_joystick(motor_id, joystick_id)
if joystick_data is None:
print("Joystick data could not be read.")
time.sleep(0.1)
continue
x_axis, y_axis = joystick_data[0], joystick_data[1]
# Convert joystick Y-axis input to PWM signal
speed = int(abs(y_axis) * 100 / 100)
if y_axis > 0:
master.set_duty_cycle(motor_id, speed) # Move forward
elif y_axis < 0:
master.set_duty_cycle(motor_id, -speed) # Move backward
else:
master.set_duty_cycle(motor_id, 0) # Stop
print(f"Joystick: X={x_axis}, Y={y_axis} | PWM: {speed}")
time.sleep(0.05)
# Start Motor Control
control_motor()
```
{% endcode %}
{% endtab %}
{% endtabs %}