Control your printer's ATX PSU through a RAMPS board using OctoPrint · foosel/OctoPrint Wiki Introduction Step by step instructions References and notes Introduction The idea Basically, if you are using the ubiquitous Arduino Mega 2560 + RAMPS 1.4 combo to interface with your printer hardware, and powering your setup with an ATX power supply, there is a simple way to switch on/off your printer with OctoPrint, without the need for any extra relays or electronic circuits. The theory One of the motherboard connector pins of the ATX power supply is a power-on input (PS_ON#, green wire) which must be driven low to switch on (soft-start) the power supply. The RAMPS 1.4 board provides a PS-ON pin which is controlled by one of the Arduino Mega 2560 pins. In this HOWTO, I'll provide the instructions to properly connect the ATX power supply to the RAMPS 1.4 board and configure the Arduino firmware and OctoPrint so that it's easy (and safe) to switch on/off your printer with OctoPrint. Step by step instructions Before you start What you want to check here: ATX PSU to RAMPS 1.4 wiring
L’AltroWeb - Web e tanto altro... | di Salvatore Noschese Thingiverse - Digital Designs for Physical Objects MySQL - Repetier Software Driving 28BYJ-48 step motor with Pololu A4988 drivers | ElectronicsMayhem I have always liked the 28BYJ-48 motor because of its power and price, it also supposed to very reliable since it is used in different types of air conditioners. Some information about the motor: This motor is very small but has enough power for most of the projects because it has a built-in 1/64 reduction gear. The result is a very small step of the motor which is 0,087890625 degrees per step. The reduction gear of course has its downiside which is the speed – you can typically drive this motor with maximum frequency of 100Hz which result in 100 steps per second which is 8,7890625 degrees per second. That is 41 seconds per revolution – Not very speedy but for the price of under 2$ it still is a very good motor. The main issue about driving this motor with a pololu a4988 driver is that this is an unipolar motor and the pololu driver is designed to work with bipolar motors. Ok, so straight to the point. This is however not that simple. Congratulations!
How to Hack Wi-Fi: Creating an Evil Twin Wireless Access Point to Eavesdrop on Data « Null Byte How to Hack Wi-Fi: Creating an Evil Twin Wireless Access Point to Eavesdrop on Data Welcome back, my greenhorn hackers! Now that we're familiar with the technologies, terminology, and the aircrack-ng suite, we can finally start hacking Wi-Fi. Our first task will be to creating an evil twin access point. Many new hackers are anxious to crack Wi-Fi passwords to gain some free bandwidth (don't worry, we'll get to that), but there are so many other Wi-Fi hacks that are far more powerful and put so much more at risk than a bit of bandwidth. What's an Evil Twin AP? The evil twin AP is an access point that looks and acts just like a legitimate AP and entices the end-user to connect to our access point. What We'll Be Doing In this scenario, we are a private investigator. Step 1Start Airmon-Ng First , we need to check whether our wireless card is operational. bt > iwconfig As we can see, our wireless card is operational and has been assigned wlan0. bt >airmon-ng start wlan0 Step 2Start Airdump-Ng iwconfig
Montar una impresora 3D en clase, una gran propuesta para Secundaria y Bachillerato Las impresoras 3D están de moda. En el mundo profesional ya hay comida ‘impresa’ que la NASA está investigando, muchas empresas interesadas en estos cacharritos y muchas nuevas empresas fundadas alrededor del nuevo mundo de la impresión 3D. ¿Y en el aula? Al igual que con el mundo de la robótica, en el aula las impresoras 3D son muy deseadas y muchos anhelan incluir una en sus aulas. Un producto caro, sí, pero que puede dar mucho juego en la clase empezando por… que sea la propia clase la que monte la impresora. Tú mismo puedes montar una impresora 3D Puedes comprarla fabricada y terminada, sacarla de la caja, enchufarla… y casi funcionará. Podemos hacerlo gracias a la ayuda de múltiples kits, que incluyen todas las piezas para construir nuestra propia impresora 3D de una forma cómoda y sin grandes quebraderos de cabeza. ¿Ejemplos? La impresora 3d ‘desde cero’. Pero no sólo podemos hacernos una impresora 3D con kits. Y aquí es cuestón de buscar. ¿Por que montar una impresora 3d?
Free scale model plans Scale models are a representation or copy of various objects that can be larger or smaller than the actual size of the object that they represent. Some of the most impressive examples of scale models are the ships in bottles, old sailboats, model railroads... Scale model maintain the relative proportions (the scale factor) regarding the dimensions of an actual object. Scale models are mostly build out of wood, althought they can be build out of various materials, such as plastic, metal, acrylic glass, paper, and in many cases the manufacture of scale models requires a combination of various different materials. There are models made by professional model makers for various purposes in science and industry, as well as in many other professions. Another type of scale models are hobby scale models or amateur scale models made by various enthusiasts and amateur model makers. Model maker should have two basic characteristics: patience and meticulousness.