Overvoltage incident (again)

What happened

I was testing servo movement via the Wemos D1 Mini when the second buck converter went down mid-test. The output voltage wasn’t checked after initial setup — a mistake I’d already made once before.

The converter shipped miscalibrated, sitting above 7V on a line rated for 5V. The moment the servo drew current, it was already too late.

The code at the time

// servo_test.go
func main() {
	// sweep servo 0 -> 180 -> 0
	for angle := 0; angle <= 180; angle += 10 {
		servo.SetAngle(angle)
		time.Sleep(50 * time.Millisecond)
	}
}