Lesson 11: Motor Control

Lesson 11 - Motor Control With DRV8833 Pupil Notes

Today We Are Learning

Today we will make a motor spin safely using the DRV8833 motor driver.

What You Will Be Able To Do

• Name the important DRV8833 pins.
• Make a motor go forward and backward.
• Change motor speed with a slider/PWM value.
• Explain brake and coast in simple words.

Why We Need DRV8833

A Bluepill pin is like a small helper. A motor needs a stronger helper. DRV8833 takes commands from Bluepill and sends enough power to the motor.

DRV8833 Pins To Remember

• Control pins: IN1, IN2, IN3, IN4
• Motor outputs: OUT1, OUT2, OUT3, OUT4
• Power and support pins: GND, VCC, EEP, ULT

Channel mapping:

• IN1 + IN2 control OUT1 + OUT2
• IN3 + IN4 control OUT3 + OUT4

Easy Direction Rules (Motor A)

• Forward: IN1=1, IN2=0
• Backward: IN1=0, IN2=1
• Coast (slow down naturally): IN1=0, IN2=0
• Brake (stop quickly): IN1=1, IN2=1

Speed Rule

Use PWM on the channel drive control (IN control in this setup):

• 0 means stop
• Bigger number means faster
• Start low, then increase

Build Checklist

• Bluepill GND connected to DRV8833 GND
• Motor power connected to DRV8833 power input
• Motor wires connected to output terminals
• IN1, IN2 connected to Bluepill for first motor channel control

Try This

1. Set low speed.
2. Run forward.
3. Stop.
4. Run backward.
5. Test coast and brake.

Think And Explain

• Which pin controls speed?
• Which pins control direction?
• What is the difference between coast and brake?

Challenge

Make a mini routine:

• forward 2 seconds
• stop 1 second
• reverse 2 seconds

Success Check

You pass if:

• Motor changes direction when commanded.
• Speed changes when PWM changes.
• You can explain what IN1..IN4, OUT1..OUT4, EEP, and ULT are for.