Compact 2-layer handheld remote using an ESP32-C3 SuperMini sub-module, eight wake-capable buttons, a discrete high-side power latch, address straps, and 2×AAA battery power.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact 2-layer ESP32-C3 Super Mini carrier with USB-C charging and power path, 5 V boost, I2S audio, external microphone, touch, LED PWM, LDR input, and edge solder pads.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact sealed ESP32-S3 GPS and motion tracker for dog collars, with external GNSS antenna, BLE telemetry, flash logging, and pogo-pad charging/programming.
Compact 115/230 VAC digital PID temperature controller for a 300 W rotary hand sealer, with Type K thermocouple sensing, isolated low-voltage electronics, independent over-temperature cutoff, standby, and auto-shutdown.
Compact 9 V, through-hole FM voice transmitter based on the approachable two-transistor Instructables/Art Swan topology, with improved bias stability, separated audio/RF supply filtering, edge-accessible LC tuning, and capacitively coupled antenna output on a 2-layer PCB.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Production-intent minimal ESP32-S3-FN8 bare-chip development board with native USB-C, protected 5 V input, 3.3 V regulation, external u.FL RF connection, boot/reset controls, and compact GPIO breakout for a future 10–12 mm-wide four-layer PCB.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact 10 mm × 50 mm cardioid condenser microphone electronics for an externally polarized RK-47/K47-style capsule, with low-noise JFET front end, transformerless balanced XLR output, and a 55–60 V polarization supply powered from standard 48 V phantom.
Production-intent minimal ESP32-S3-FN8 bare-chip development board with native USB-C, protected 5 V input, 3.3 V regulation, external u.FL RF connection, boot/reset controls, and compact GPIO breakout for a future 10–12 mm-wide four-layer PCB.
Compact four-quadrant APD receiver with simultaneous slow pointing outputs, a local LTC6561 fast acquisition path, comparator detection, temperature sensing, and isolated external APD bias input.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact 2S–3S sensored three-phase BLDC ESC concept on an exact 25.4 × 50.8 mm four-layer PCB, with STM32 motor control, receiver UART, Hall inputs, wheel-speed sensing, and 5 V/3.3 V control rails.
Motion-activated cat deterrent sprayer controller: Ø34 mm round PCB using an ATtiny85, 3.3 V PIR/logic rail, 5 V USB power-bank pump rail, MOSFET pump drive, optional keep-alive load, and compact top-side SMT layout.
Motion-activated cat deterrent sprayer controller: Ø34 mm round PCB using an ATtiny85, 3.3 V PIR/logic rail, 5 V USB power-bank pump rail, MOSFET pump drive, optional keep-alive load, and compact top-side SMT layout.
Compact USB-powered desktop CO₂ air quality monitor using an NDIR CO₂ sensor, microcontroller, OLED display, and visual good/moderate/poor status indication.
Compact battery-powered active anterior rhinomanometer with USB-C charging and BLE streaming to Android and iOS, benchmarked against the GM Instruments NR6 and published rhinomanometry guidance.
