Technical articles on engineering, scientific Python, embedded systems, and power systems.https://alpisto.eu/en-ushttps://alpisto.eu/blog/deep-learning-for-n-1-security/https://alpisto.eu/blog/deep-learning-for-n-1-security/Neural networks can screen contingencies 300× faster than full AC power flow — at 98%+ accuracy. A survey of CNN, GNN, and DCNN approaches, the data problem, and where the field still struggles.Sun, 24 May 2026 00:00:00 GMTpower-systemsmldeep-learningn-1contingency-analysishttps://alpisto.eu/blog/ml-thermal-soaring/https://alpisto.eu/blog/ml-thermal-soaring/A survey of deep learning and reinforcement learning for autonomous thermal soaring — LSTM/GRU/TCN/Transformer architectures, POMDP and PPO/TD3 formulations, Kalman + ML hybrid filtering, and a concrete five-stage plan for an on-board AI co-pilot for paragliders.Mon, 23 Feb 2026 00:00:00 GMTflybeepermachine-learningreinforcement-learningthermal-soaringparaglidinglstmtransformertcnkalman-filterliterature-reviewhttps://alpisto.eu/blog/flybeeper-sun-vario/https://alpisto.eu/blog/flybeeper-sun-vario/A solar-powered BLE variometer that weighs under 8 g and never needs a battery change. Supercapacitor energy buffer, USB-C emergency charge in 60 seconds, 500,000 cycles, operating range -15 °C to +70 °C — designed as a primary vario for hike-and-fly paragliding.Tue, 20 Aug 2024 00:00:00 GMTflybeepersun-variovariometerbluetooth-lesolarsupercapacitorparaglidinghardwarehttps://alpisto.eu/blog/flybeeper-fanet/https://alpisto.eu/blog/flybeeper-fanet/An always-on BLE bridge to the 868 MHz FANET data network. No on-board GPS — the smartphone provides position, the device just radiates. Solar-powered, years of standby, full radio configuration over GATT so apps can transmit FANET, ADS-L or anything else on the same radio.Wed, 08 May 2024 00:00:00 GMTflybeeperfanetlorabluetooth-lenrf52paraglidinghardwarehttps://alpisto.eu/blog/flybeeper-tas/https://alpisto.eu/blog/flybeeper-tas/A purpose-built BLE true-airspeed sensor for paragliders and hang gliders up to 103 km/h IAS. Custom CFD-designed pitot tube with a 4% correction coefficient versus 50% for hobby tubes, four PCB revisions ending in USB-C supercap charging, and standards-compliant BLE GATT services.Sat, 30 Dec 2023 00:00:00 GMTflybeepertasairspeedpitot-tubebluetooth-lenrf52paraglidinghardwarehttps://alpisto.eu/blog/flybeeper-pressure-sensor/https://alpisto.eu/blog/flybeeper-pressure-sensor/An external BLE pressure sensor for paragliding flight apps like xcTrack and SeeYou Navigator. Always on, pair once and forget — wakes the moment the app subscribes to ESS pressure notifications. ±2 cm/s vertical-speed resolution from an SPL06, 5-year standby on a single CR2032.Sun, 24 Dec 2023 00:00:00 GMTflybeeperps1pressure-sensorbarometerbluetooth-lenrf52paraglidinghardwarehttps://alpisto.eu/blog/flybeeper-remote-control-4/https://alpisto.eu/blog/flybeeper-remote-control-4/An always-on four-button BLE remote for paragliding flight apps. No power switch, deep-sleep when idle, automatic wake when an app connects — battery life measured in years from a single CR2032. Built on Nordic nRF52, exposes the standard Automation IO Service.Fri, 22 Dec 2023 00:00:00 GMTflybeeperrc4remote-controlbluetooth-lenrf52paraglidinghardwarehttps://alpisto.eu/blog/flybeeper-mini-bt/https://alpisto.eu/blog/flybeeper-mini-bt/A dwarf-sized BLE 5 variometer on nRF52 + Zephyr RTOS, exposing pressure, temperature, altitude, four-button remote and OTA updates through standards-compliant GATT services. The entire stack — GPIO, SPI, PWM, ADC, FLASH, OTA, DFU, BLE, GATT, plus the OS — fits in 200 kB.Wed, 09 Aug 2023 00:00:00 GMTflybeepermini-btvariometerbluetooth-lenrf52zephyr-rtosparaglidinghardwarehttps://alpisto.eu/blog/canflybot-soaring-forecast/https://alpisto.eu/blog/canflybot-soaring-forecast/A Telegram bot that wraps the Paraglidable AI forecast and Meteoblue thermal soundings for paragliding pilots. Tracks 10,000+ take-off and landing spots, pings you when probabilities exceed your thresholds, and serves detailed thermal diagrams on demand.Sat, 25 Feb 2023 00:00:00 GMTflybeepercanflybottelegram-botweatherparaglidablemeteobluethermal-forecasthttps://alpisto.eu/blog/flybeeper-f1-test-report/https://alpisto.eu/blog/flybeeper-f1-test-report/Five hours, three F1 units, two GPS antennas, one RF interference incident over Cividale. Notes on GPS lock quality, vario behaviour, BLE companion app, and a Tagliamento-crossing flight across the Julian Alps.Mon, 16 May 2022 00:00:00 GMTflybeeperf1test-flightparaglidingfield-testgnsshttps://alpisto.eu/blog/flybeeper-f1/https://alpisto.eu/blog/flybeeper-f1/A pocket-sized paragliding flight instrument with GNSS, barometer, 868 MHz LoRa FANET, BLE 5.0 and on-board logging. Built as both a FANET tracker and the main vario, with a long development log covering hardware, firmware, FAI-recognised IGC validation and a Web BLE configurator.Thu, 21 Apr 2022 00:00:00 GMTflybeeperf1fanetparaglidinggnssblehardwarehttps://alpisto.eu/blog/flybeeper-horn/https://alpisto.eu/blog/flybeeper-horn/The smallest variometer in the FlyBeeper line, doubling as an emergency whistle and acoustic distress beacon. A demanding miniature project that combines tight PCB design, a composite CR2032 holder, and a 3D-printed enclosure that has to actually whistle.Mon, 07 Mar 2022 00:00:00 GMTflybeeperhornvariometerparaglidinghardware3d-printing