Python Library Spire.Doc Shows How to Convert Markdown Files to PDF

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A DEV Community tutorial explains how Markdown, widely used for technical documentation, can be turned into fixed-layout PDFs for printing, archiving, or delivery. It demonstrates two approaches using the Spire.Doc for Python library, installed via pip. The basic method loads a Markdown file and saves it directly as a PDF, with the library parsing the document structure so headings, lists, and emphasis are formatted rather than shown as raw text. The article also covers customizing paper size, page orientation, and margins before conversion, since Markdown itself does not specify those settings. A sample script is provided that creates an output folder and writes the resulting file.

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LiDAR Sensors Face Power-Line Noise That Can Degrade Perception Performance

The article explains that LiDAR units combine precision analog sensing, high-speed digital processing, laser pulse generation, and timing circuits in one compact housing, making them sensitive to electromagnetic interference. Power-supply noise can alter receiver thresholds, timing references, and clock stability, so electrical faults may appear as perception errors. The author argues the LiDAR power input should be treated as an EMC interface, since switching ripple, transients, and ground shifts from robot components like motor inverters and relays can reach the sensor. Conducted noise travels through both differential and common-mode paths, and pulsed laser current draw can also feed noise back into the robot's power network. Because source impedance and cable routing strongly influence these effects, filtering and layout decisions must be based on measured disturbances across the installed power path.

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ProgrammingDEV Community ·

100BASE-T1 Ethernet EMI: Keeping Differential Symmetry to Limit Common-Mode Noise

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ProgrammingDEV Community ·

AiTM phishing hijacks login sessions to enable business email fraud

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ProgrammingDEV Community ·

Motor Driver EMI: How PWM Switching Creates Electromagnetic Noise

Pulse-width modulation is widely used in motor drives because it efficiently controls voltage, current, torque, and speed. However, the fast switching transitions that give PWM its high efficiency also generate a broad electromagnetic noise spectrum. As a result, a motor inverter acts as a repetitive high-frequency excitation source that couples energy through power cables, motor windings, and chassis structures. The spectrum's envelope depends strongly on rise and fall times, as well as on the switching devices, duty cycle, and modulation scheme. Differential-mode noise arises from rapidly changing currents in power loops, while common-mode noise couples through parasitic capacitance to the chassis and surrounding structures.

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