PWM Motor Control with ESP
0:31
Below is a summary of the recommended schematic changes for driving two motors with your two Q1 transistors and protecting the circuit:
For Each Motor Drive (using Q1 and Q2):
-
Gate Resistors:
- Add a series resistor (around 100Ω – 220Ω) between a PWM-capable pin of the U1 and the gate of each transistor ([Q1] for Motor 1 and [Q2] for Motor 2).
- These resistors help limit the gate charging current and prevent oscillations.
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Motor Components:
- Include a generic DC motor symbol for each motor (e.g., DC Motor) – label them as [M1] and [M2].
- Connect the positive terminal of each motor to your motor supply voltage and the other terminal to the drain of the corresponding transistor.
-
Flyback Diodes:
- Add a flyback diode across each motor to protect the transistor from voltage spikes when the motor is switched off.
- Use a diode such as 1N4007 and connect it such that the cathode is tied to the motor supply (positive side) and the anode is tied to the transistor’s drain (motor side).
- Label these diodes as [D1] for Motor 1 and [D2] for Motor 2.
-
Common Ground:
- Ensure that the sources of both transistors and the ESP32’s ground are connected to a common Ground.
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