Posts Tagged ‘Measuring instruments’

Engine RPM (Part 1)

Part 1, 2, 3, 4, 5 The measurement of an internal combustion engine speed is expressed in  Rounds Per Minute, so as to say, the number of revolutions of the crankshaft per minute. The RPM can be used for various applications such as with checking/calibrating the RPM dial (if any installed), adding a warning light for […]

PlainDSP (Part 4)

Part 1, 2, 3, 4 Here is the autonomous version of the sound meter which principle is described in PlainDSP (Part 3). The picture below shows the full schematics of the device   And here is the code of MicroSNDMTR_LCD, which includes the auto-ranging algorithm /* MicroSNDMTR_LCD: Micro sound meter connected to LCD 2×16 display Exemple of use of the […]

PlainDSP (Part 3)

Part 1, 2, 3, 4 —————————————————————————— Important notice: The huge popularity of PlainDSP (merge of PlainFFT and PlainADC libraries) and the numerous requests for help drove me to think about a convenient solution for all designers, artists, students, professors, R&D people, prototypists who need to understand, experiment, create systems which feature advanced Digital Signal Processing on Arduino. The result […]

PlainDSP (Part 2)

Part 1, 2, 3, 4 The next lines of code illustrate how PlainDSP simplifies the combination of data acquisition and data analysis. You no longer need to worry about the vectors of data. PlainDSP creates dynamically  and transparently the required vectors. On the other hand you must keep in mind that they exist and take 8 times the number […]

PlainDSP (Part 1)

Part 1, 2, 3, 4 Among the most popular subjects covered in this blog, FFT is far ahead any other subject (22%!), followed by data acquisition functions. I got many, many requests for PlainFFT and PlainADC libraries and thanks to your explicit messages, I have a quite good understanding of who is using them and for which type of […]

SHTx Temperature and Humidity Sensor (Part 1)

Part 1, 2, 3 I introduced the temperature and humidity sensors from SENSRION a couple a months ago [link to this post], and I recently decided to use one of them for building a sensor which would aggregate multiple physical measurements. For the sake of saving time, I ordered the PARALAX module which is handy and has a […]

Extremely Low Frequency Electro Magnetic Field Sensing (Part 4)

Part 1, 2, 3, 4, 5 FFT posts are the far most visited pages from Arduinoos, and MicroELFEMF is one of the simplest and cheapest example of implementing this complex function. I got many requests and questions related to this subject, which drove me to publish some more explanations. Understanding frequency bins is not trivial and I encourage you […]

RIGOL 1052E DSO (Part 1)

Part 1, 2, 3 RIGOL 1052E DSO review In the 80s, I have been using the top most fancy oscilloscopes from HP. Unfortunaltely, they were heavy, mine was an analog one, without memory, and they were expensive for private use. In the 90s and Y2Ks, I have been using a basic ITT analog scope: forget it. And then […]

I/O LED (Part 4)

Part 1, 2, 3, 4, 5, 6 Here is a new version of the sensing LED. The sensing LED is turned on almost all the time, with very short periods of time during which it is biased as a photo LED. The measuring time is so short that it is almost impossible to observe the flickering effect. Approaching a source of […]

I/O LED (Part 3)

Part 1, 2, 3, 4, 5, 6 Additional works on I/O LED brought me to publish the next coming posts. Firstly, I observed that amongst the various LEDs tested from my stock, some were simply not suitable for I/O operation, while the high brightness red LEDs where performing optimally. Here is an illustration of the simplistic hardware that you may use […]