Summary

Jason Sachs walks through the practical basics of using a microcontroller to switch an electromagnet. The blog explains both the electrical design (switching devices, protection, and power concerns) and the firmware/logic considerations needed to drive an inductive load reliably.

Key Takeaways

• Choose an appropriate switching device (BJT, MOSFET, or driver IC) based on current, voltage, and Rds(on)/SOA requirements.
• Calculate and implement proper flyback protection and snubber networks to protect the switch and MCU from inductive transients.
• Implement PWM and timing in firmware to control coil energization while respecting thermal and current limits.
• Protect the system with proper decoupling, transient suppression, and current-limiting strategies on the PCB.
• Test and validate the driver stage under realistic load and edge-case conditions to ensure reliability.

Who Should Read This

Early-career embedded hardware and firmware engineers, students, or interview candidates who want hands-on guidance for safely switching inductive loads with a microcontroller.

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