An italian company, Lemontech, kindly provided me a sample of their new Arduino shield, named BlueRelayShield: The yellow-colored shield has: [checklist] a Bluetooth HC-05 module two SRD-05VDC relays two 5mm 3 contacts screw terminals two status leds [/checklist] Using this shield you can switch on/off two loads (connected to the relays) sending commands via Bluetooth. HC-05 Module The included HC-05 module allows a Bluetooth device to talk with Arduino via…
In a previous post, I’ve already introduced the UIPEthernet library, that allows to reuse the sketches designed for the official ethernet shield also with the ENC28J60 chip. Some days ago Giorgio (official site), an Arduino maker from the Province of Turin, kindly sent me one of his sketches which uses that library to publish a webserver which let you change the status of…
In the last months, important improvements to the Ethercard library have been made and it’s now possible to send data divided in multiple TCP packets: let’s see how to do it…
With this small tutorial, I’m going to show you how to read the position of a 3-way switch using just one Arduino’s analog PIN. A 3-way switch (sometimes called ON-OFF-ON or SPTT) has 3 PINs: the common (on the center) and the two outputs. When the lever is up or down, the common PIN is connected to one of…
In some of the previous tutorials, you’re already learned how to program simple sketches to remotely control leds, relays… today I’m going to show you how to secure those projects with the addition of a password.
After having introduced you, in a previous post, the led strips and after having explained how to control a digital strip, today’s post is about a simple project I made after a request from a friend: make a strip led blink at a variable frequency.
In a post some days ago, Olimex announced they will move to KiCad for their new boards that follow the OSHW principles (OpenSource HardWare). As many designers and hobbists, at the moment Olimex uses Eagle as their preferred EDA tool. The post summarize the main limits in Eagles’s licensing policies and why they chose KiCad among the other available…
After some months without posts, I’m going to continue this tutorial with some new projects… but first today I’d like to talk about a different library…
All of you certainly had to configure an RTC chip with the current date and time… today’s project can help to perform that task!
Futura Group, published of the italian magazine Elettronica In, has just made available for free all the projects and articles printed on the magazine up to number 143. On the official website you can also read and download: the courses (programming with Android, Atmel microcontrollers, openPICUS…) the monographs (3d printers, DMX…)