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circuitrocks1h ago · 2 min read

Powered by Raspberry Pi: Photo Booths, Audio DSP and Tablets

A party in France wraps up, two people fold a 35 kg photo booth flat, and a print slides out in under 30 seconds with a Raspberry Pi 5 running the whole show. That scene comes from the latest "Powered

circuitrocks.hashnode.dev

circuitrocks5d ago · 2 min read

Doom Runs on a $30 Clamp Meter With Just 32 KB of RAM

Every few months someone ports Doom to a device that never asked for it: calculators, cameras, printers. The latest target is a $30 FNIRSI DMC-100 clamp meter with only 32 KB of RAM, and the Hackster

circuitrocks.hashnode.dev

Jietion6d ago · 9 min read

GPS Tracker Reporting Intervals and Keep-Alive Timers: How Firmware Settings Drive Monthly Usage

Definition: For GPS trackers, an IoT SIM carries position reports, alarms and configuration traffic, so the tracker’s reporting interval and keep-alive timers decide how many megabytes each SIM uses p

liotsim.hashnode.dev

Sergey SizovOct 22 · 4 min read

I Built an AI OS That Evolves on Demand

I built S1-ADV, an AI OS for the M5Stack Cardputer ADV, around a simple idea: the next feature starts with a request. An idea can move through AI-assisted development, a build, review and an approved

s1z0v.hashnode.dev

DisplayEngineerOct 22 · 7 min read

Why your ST7701S screen goes black after a reboot in ESPHome

The bug report that sent me into ESPHome's reset code keeps showing up in slightly different forms. Someone flashes a Waveshare ESP32-S3-Touch-LCD-4 over USB and the 480×480 ST7701S panel comes up fin

displayengineer.hashnode.dev

iMLite GolfOct 20 · 10 min read

Golf Course Data, Compressed: What Fits Inside 100KB Per Hole

A golf course dataset is not road network data. Road networks answer "how do I get from A to B"; a course dataset answers "what will this shot pass over, and where will it land". Get the underlying mo

1 imlitegolf.hashnode.dev

DisplayEngineerOct 19 · 10 min read

ESPHome Drops ili9xxx, st7789v and st7735 in 2027.5.0: Migrating SPI TFTs to mipi_spi

ESPHome has now put a date on the end of its legacy SPI display drivers. Four pull requests merged on 14 October 2026 (#20687 ili9xxx, #20688 st7735, #20689 st7789v, #20690 qspi_dbi) change the deprec

displayengineer.hashnode.dev

Yunus Emre VurgunOct 18 · 13 min read

Your 256-byte Q-table is lying to you: rounding, not memory, is what breaks RL on microcontrollers

Disclosure: this article was written for Yunus Emre Vurgun, who wrote Fringe Learning: Resource-Efficient RL for Edge ML, a short practical guide linked at the end. The experiment below is small, runs

yunusemrevurgun.hashnode.dev

JietionOct 10 · 11 min read

Battery-Powered IoT Sensors: Power Budgets, LPWAN Choice and SIM Settings for Underground and Remote Sites

Definition: For a battery-powered sensor, the IoT SIM decides which network the device may join, which power-saving timers the network grants, and therefore how many years a fixed battery can carry th

2 liotsim.hashnode.dev

JietionOct 5 · 10 min read

IoT SIM for Power Distribution Area Monitoring: Remote Terminal Management, Anomaly Detection and Field Operations

Definition: In distribution-area monitoring, IoT SIMs connect transformer, switchgear, cable and feeder sensing terminals and their edge gateways to the utility’s master station, so equipment conditio