LoRaWAN, Mini PCs, and Arduino
-
AI, computer vision meet LoRaWAN with SenseCAP K1100 sensor prototype kit - CNX Software
In the first part of SenseCAP K1100 review/tutorial we connected various sensors to the Wio Terminal board and transmitted the data wirelessly through the LoRa-E5 LoRaWAN module after setting the frequency band for Thailand (AS923). In the second part, we’ll connect the Grove Vision AI module part of the SenseCAP K1100 sensor prototype kit to the Wio Terminal in order to train models to capture faces and display the results from the camera on the computer. and evaluate the results of how accurate the Face detection Model is. Finally, we’ll send the data (e.g. confidence) using the LoRa-E5 module to a private LoRaWAN IoT Platform system.
-
Lilbits: Raspberry Pi Zero-like mini PCs compared, RP2040 microcontroller overclocked, and reducing the wait time for Purism’s Librem 5 Linux smartphones
The Raspberry Pi Zero and Raspberry Pi Zero 2 are incredibly small, cheap, and versatile single-board computers… but in a time of global supply chain shortages, they’re also kind of hard to get your hands on these days. But there are also a growing number of other tiny PCs competing in this space. And Bret Weber has managed to assemble a bunch of them and run a series of performance tests that may help you decide which best meets your needs.
[...]
In other Raspberry Pi-related news, there’s a new adapter that lets you use a Raspberry Pi Zero as if it were a Raspberry Pi Compute Module 3, and a Raspberry Pi intern wanted to find out what happened if you overclocked a RP2040. The results are both impressive and potentially destructive.
-
Building an electronic pantograph with Hall effect sensors | Arduino Blog
A pantograph is a machine that lets an artist copy an image by tracing the original. Traditional mechanical pantographs use a complex linkage system to move the output pen relative to the stylus. While 1:1 pantographs do serve a purpose, the real value comes from a pantograph’s ability to scale the output. It is possible to create an output drawing several times the size of the traced image and also to do the opposite, which is particularly useful for fine engraving work. Mechanical pantographs are now niche machines, but this tutorial will walk you through how to build an electronic pantograph using an Arduino and Hall effect sensors.
Hall effect sensors detect the presence of a magnetic field and engineers often use them as proximity sensors. For example, security systems use Hall effect sensors to detect when a door closes or opens. But Hall effect sensors also detect the magnitude of the magnetic field, which means they are useful for more than binary proximity detection. In this case, two 49E linear Hall effect sensors in the joints of the pantograph’s tracing arms monitor rotational angle. Those connect to an Arduino Nano board as analog inputs so the Arduino can monitor the magnitude of the magnetic fields and determine the angle of each joint.