Mostly because I wanted to verify that it really worked:
The Arduino Nano runs the default Blink program that all the knockoff manufacturers use as their final QC test.
The MP1584 specs say the Enable input can accept a logic signal up to 6 V, the Nano runs at 5 V regulated down from the 6.3 V from the bench supply, and the 1 W red LED now flashes 1 s ON / 1 s OFF.
The current feedback works as it did before, too, which is comforting.
The Nano adds 20 mA to the bench supply, so the whole affair runs at 220 mA = 1.4 W. Of course, it’s now at a 50% duty cycle, so that helps.
I doubt hand-hewing an astable multivibrator is the right way to add blinkiness, but it’d definitely be playing on hard mode.
The Smell of Molten Projects in the Morning 
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2 responses to “MP1584 Current Regulator: Arduino Blinkiness”
[…] semi-scaled doodle laying out an Arduino Nano and the MP1584 regulator board suggested they might fit behind the heatsink with the 1 W […]
[…] The Arduino and regulator draw power from the Bafang motor controller’s 6.3 V headlight circuit. The 2.2 Ω resistor sets the LED current to 360 mA = 900 mW. The blue wire connects the Arduino’s default LED output pin (D13) to the regulator’s Enable input (pin 2) to allow programmatic blinkiness. […]