It can be controlled through logic levels to set the speed and the direction of the rotation of CC brushed motors and stepper motors; outputs have LEDs indicating the rotation direction. The circuit board we are presenting this time is based on the dual-bridge driver L298N, in a traditionally mounted version in a…
It allows us to detect the presence and passage of an object thanks to the combination of a laser diode which emits a light ray and a phototransistor which detects reflected light. Robotics applications and industrial control systems normally make use of optical systems in order to detect proximity and passing of objects,…
It measures solar radiation and visualizes the corresponding value on the integrated display of a miniaturized Arduino, in order to tell us when to expose ourselves to the sun… Summer is just around the corner and whether you choose the seaside or the mountains for your holidays, there is no doubt that most of…
Let’s call back an electronic version of one of the most famous casino games: no tricks and no cheats… The “roulette” is without a doubt one of the most famous and practiced casino games in the word, and it is surely one of the most widely employed, along with poker, in famous movies from…
A control unit for the garden sprinkler that can be controlled via web and smartphone thanks to Arduino Yún. With summer approaching, our plants and our gardens need some regular watering in order to stay lush and green as we like them. It’s not easy to always remember to water plants and gardens…
Let’s test out the capabilities of the DFR0299 audio player module, an ideal choice for Arduino but also for many stand-alone applications. In this article, we decided to design and propose a demoboard for the DFR0299 module we already used in the ‘Presepino’ project; this module will function as a development platform for…
Let’s discover the potential of the instant messaging app, Telegram, by creating a remote control, based on a smartphone and a WiFi powered demoboard. We may say that, when we have our smartphone in our hands, we have a door opened to the world. This is not just because of the global connectivity (mobile…
Designed to be coupled to an irrigation controller, a weather station or motorized curtains and rolling shutters, it shuts down a relay when rain is detected. One major issue when dealing with sprinkler controllers is rain starting to pour during sequences execution, because in this case it is useless – if not damaging…
Let’s create a new evolution for our 3Drag printer, with a dual extruder for the printing of chocolate items of two types or colours. The 3Drag printer has been our answer to the growing need – on the part of the general public (a need that was already shown towards the RepRap project) –…
It allows to change the revolutions per minute in any brushed motor that is powered by 12 to 35 Vcc, thanks to a handful of electric components and to the popular 555 timer. In different applications, such as for example electric drills and screwdrivers (and fans as well), it becomes necessary to adjust –…
A compact stereo amplifier that may be used at home as well as in the car, and also to substitute broken audio power amplifiers or to create bench power amps for the analysis of audio devices. When repairing audio devices, it is always useful to have a BF amplifier on your workbench; all the…
Makes Raspberry Pi suitable to be used in “professional” environments, sports a power source, an UPS, a RTC clock, a watchdog function, RS232 and RS485 converter and a buzzer. All in one. In the previous posts in which we presented different solutions – and above all in the professional daily work – we…
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