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5 Stories Published
Sensors & Data
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7m
Build a Precision Scale With a Load Cell and an HX711
Questions and answers on building a load-cell scale with an HX711: the Wheatstone bridge, calibration with a known mass, how much noise…
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7m
Build a Hall-Effect RPM Tachometer With an Arduino
A build guide for an Arduino tachometer using a Hall switch and a magnet: how the sensor responds, interrupt-based pulse timing, the…
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7m
Log Temperature, Humidity and Pressure With a BME280 and Python
Wire a BME280 to a Raspberry Pi, log readings to CSV with Python, and plot them with matplotlib, with the datasheet's accuracy…
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7m
PM2.5 Air-Quality Monitor With a PMS5003 and an ESP32
How a laser-scattering PM2.5 sensor counts particles, what the PMS5003 datasheet promises, how to parse its 32-byte frame on an ESP32, and…
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7m
Track Aircraft With an RTL-SDR Dongle and ADS-B at 1090 MHz
How ADS-B works on 1090 MHz, how to size a vertical antenna, and how to go from an RTL-SDR dongle to a…