Most examples that we provided so far to interact with Yoctopuce USB sensors use sequential function calls. This is called the procedural approach, using polling. We recommend this technique as a starting point, because it is generally more intuitive and less risky. There is, however, an alternative approach, sometimes more convenient: the event-based technique, using callbacks. This is the new API feature that we present today.
One of our customers recently noticed that the description page of our temperature, light, humidity, and pressure sensors mentions the capability of recording data to a flash memory. The documentation however does not cover this topic, and there is nothing about it in the programming library either. It is now time to fix that...
Do you recall the USB/laser mail box? It is working well, thank you. But the signaling part has a big WAF issue. Indeed, a Yocto-Color device directly glued on the wall might look at bit ugly to some sensitive people. This article will explain how to use Plexiglas® refraction/reflexion properties to make a luminous picture frame with a changing color feature.
This week, we are happy to announce the availability in our on-line shop of two new USB sensors: the Yocto-Meteo, that superseeds the Yocto-Humidity, and the Yocto-Light, that was used in last week project. Let's take this chance to tell you more about them.
Do you remember the Yoctopuce mailbox we customized to detect the postman? Well, the system was working reasonably well, but it had some flaws. We had to use insanely long and expensive USB cables, the ball-switch wires were too fragile to be put on an articulated part, and the system could only detect letters, not parcels (our mail box has two sections, one for letters the other for parcels).
So we decided to improve the concept using a Yocto-Light and a laser.
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