What’s round, has what looks like a vacuum tube in the center, and was made in the 1950s by HP? We don’t know either, but [The Signal Path] restored one and shows us this mystery instrument in a recent video that you can see below. We aren’t going to spoil the surprise over what the device is, […]
MYSTERY HP GEAR TEARDOWN Continue Reading
Something like 99% of the people on the road at any given moment will consider themselves an above-average driver, something that’s as statistically impossible as it is easily disproven by casual observation. Drivers make all kinds of mistakes, but perhaps none as annoying and avoidable as failure to use their turn signal. This turn signal
ANNOY YOURSELF INTO BETTER DRIVING WITH THIS TURN SIGNAL MONITOR Continue Reading
Multiplexing is a very old technology in which control signals are intermixed for the sake of being able to control more devices than there are control signals. For [mihai.cuciuc], the problems started when he multiplexed some very efficient LEDs. The problem? In two banks of six LEDs each, both LEDs connected to a single Arduino pin would light,
(GETTING RID OF) THE GHOST IN THE LED Continue Reading
Notice: no vintage Hewlett Packard test equipment was harmed in the making of this overly complicated Nixie clock. In fact, if anything, the HP 5245L electronic counter came out better off than it went into the project. We mention the fate of this instrument mainly because we’ve seen our fair share of cool-looking-old-thing-gutted-and-filled-with-Arduinos projects before, and
A NIXIE CLOCK, THE HARD WAY Continue Reading
Hygrometers are used to determine the moisture content of the environment. They find application in farms, food storage, museums, and other places where moisture needs to be monitored to ensure damage is not done to goods and other things stored in that space. For today’s tutorial, we are going to build a Hygrometer using the
ARDUINO OLED HYGROMETER AND THERMOMETER USING DHT11 Continue Reading
This sketch is used by Exercise: Sensor Fade. Full Source Code The full code is all in one file SensorFade.ino. // SensorFade – read a photosensor and control several LEDs at different brightnesses // // Copyright (c) 2016, Garth Zeglin. All rights reserved. Licensed under the // terms of the BSD 3-clause license as included in LICENSE.
Arduino Sketch Sensor Fade Continue Reading
The MAXREFDES1048 synchronous step-down dc-dc converter reference design from Maxim Integrated Products is based on the MAX17504, a high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs can operate over a 4.5V to 60V input. The MAXREFDES1048 reference design operates over an input voltage range of 18- to 36-Vdc and delivers an output of 3A. The MAX17504 can deliver up to
3.3V/3A, WIDE-INPUT, SYNCHRONOUS, STEP-DOWN DC-DC REFERENCE DESIGN Continue Reading
Since the launch of the ESP-01, the ESP series of WiFi modules and WiFi-enabled microcontrollers have endeared themselves to the heart of both hobbyist and electronics design professionals. They have been used for all sorts of projects and while users are still praising the impressive features built into its most recent version, the ESP-32, Espressif systems have announced details
ESP32-S2 PROCESSOR DATASHEET RELEASED, DEVELOPMENT BOARDS UNVEILED Continue Reading
N.B. this is new and still being tested. This sketch demonstrates several examples of single-channel filters for processing sensor data. The filter functions are purely numeric operations and not dependent on any Arduino-specific features. This supports offline testing, as they can be compiled for debugging and evaluation on a normal desktop computer. The code is
Arduino Sketch FilterDemos Continue Reading
N.B. this is new and still being tested. This sketch demonstrates an example of ultrasonic range sensor data processing using a combination of signal filters and a classification tree. The classifier code was generated using the Python script classify_gen.py on recorded and labeled training data. The underlying classification tree was automatically generated using the Python scikit-learn library. For more
Arduino Sketch Classifier Demo Continue Reading
