Engineering-first robotics, AI, maker hardware, STEM, and creator technology reporting
A hobby servo can pull several hundred milliamps while moving and more than 1 A under load, collapsing a shared 5 V rail even when the PWM timing is correct.
Servo Movement Resets the Controller? Debug the Power Path Before the PWM Read More
A USB-powered board can work through an A-to-C cable yet stay dead on a C-to-C supply when its receptacle lacks the required Rd pull-down on both CC1 and CC2.
USB-C Board Works With A-to-C but Not C-to-C? Check Both CC Pull-Downs Read More
A negative INA219 current reading can indicate real reverse flow or reversed shunt polarity. Check VIN+ and VIN−, shunt voltage sign, and calibration state in that order.
INA219 Shows Negative Current? Check VIN+ and VIN− Before Recalibrating Read More
A 10× probe can add capacitance and loop inductance that distort fast edges. Qualify compensation, grounding and bandwidth before diagnosing the board.
Oscilloscope Probe Loading: Fix the Measurement Before the Circuit Read More