Archive for the ‘Hardware’ Category


Part 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 First serious failure…After exactly 4 years of regular use, I experienced the first failure which is due to an aged component. Although Peek is a very strong material, it did not sustain any longer the thermal strength which it endured for years. This critical part is responsible for guiding the “cold” […]

100 !

This picture illustrates my production of facial masks frames of the Easter week-end!I never produced that many parts of the same sort using my brave old Vertex printer. So far, I experienced only 2 failures:– 1 part was poorly printed showing gaps and lacks of filament. This problem did occur any more after a careful […]

By all means

By all means let’s stop the covid-19! The heroes are those who stay home, in small flats, with nervous kids, noisy neighbors, low stocks of toilet paper and plenty kindness through the networks. The action men and women keep the ball rolling, feed us, power our phones and care about us. They deserve as much […]

Light sensor (Part 2)

Part 1, 2 In the previous part of this publication, I covered the subject of sensitivity. As for many sensor, the range is very broad and a simple configuration cannot help covering the whole range of light intensities. As in the dated controllers, we might want to use a hand operated sensitivity selector. Although this […]

3D prints: Stevenson screen

Building a basic weather station today is simple and cheap thanks to specialized integrated circuits featuring temperature, humidity and pressure sensing. Up to now my favorite is the Bosh bme280; you may easily find it ready for use on small PCBs, easy to connect on any prototyping platform. Adafruit industries is selling a very convenient […]

3D Printing (Part 14)

Part 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 The heating plate is made of two symmetric printed conductive layers ~1.5 Ohm each. As printed on the heating plate you may wire them for use with 12 V or 24 V power supplies. As we need to add an extra power supply the choice for a 24 V power supply […]

3D Printing (Part 13)

Part 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 Many PLA rolls were fused in my Welleman k8400. So far, it has been a good servant in spite of few breakdowns, mainly due to clogged nozzle or improper adjustments. Careful cleaning and fine tuning solved all  these problems except one which is my fault. As I was taking apart the […]

TASCAM Sound Recorder (Part 1)

Part 1, 2, 3, 4, 5 The followers of arduinoos know that I have a constant and strong interest in sound recording and analysis. As I get more and more requests for specific sound analysis, I decided to get a semi-professional sound recorder to capture sound events in various environments. Thus the wish list that […]

Retour vers le futur

Allez, zou, pour une fois voici une publication en français ! Cà fait un moment que çà me grattouillait le clavier de composer dans ma langue maternelle, et je vois au moins deux bonnes raisons de faire une entorse à ma politique de publication. Soyons réalistes, l’anglais est une langue universellement comprise par les technophiles, […]

Shortage of Multilayer Ceramic Chip Capacitors (MLCC)

How come this tiny ultra familiar component is running out of stock ? The information raised by constructors and vendors states that the unexpected growth of demand lead to a recurent shortage of products as explained here, there and here again. These papers also give advises for those who did not contract the supply of […]