All too often, the commentors here on Hackaday display some parsimony in their engineering prowess. If someone uses a Raspberry Pi to blink a few LEDs, someone will invariably chime in that an ARM microcontroller would do just as well. switching a relay on and off belies the capabilities of a 32-bit Cortex microcontroller when a simpler 8-bit build would certainly suffice. Of course this can always be minimized to a 555 circuit and additionally still to conditioned pigeons tapping a crucial in action to either food or opiates. I’d like to take this opportunity to present a tutorial. Not just any tutorial, but the actual foundation of everything we love here at Hackaday: blinky, glowey things.
You can check out the rest of this tutorial after the break.
The battery
Put bluntly, every project taking care of electrical energy needs a power source. Whether through mains power, a solar cell, some sort of odd inductive contraption, or through a chemical reaction, every electronic project needs a power source. I have considered a few different power sources for this project including mains power (far too hazardous to use with a light bulb), a bicycle generator (I’m focusing on strength training this week. Cardio is next week), hamsters and wheels (burning the hamsters as a fuel source and using a heat exchanger to turn a turbine), and magnets (how do they work?). In the end, I settled on using a battery to power the light bulb for this project.
The battery used for this build. It consists of four ‘D’ cells connected together in series by means of a COMF UM-1×4 battery holder. It supplies 6 Volts across its terminals.
The power source for this project is called a battery, as it is made up of a collection of cells. [Benjamin Franklin] came up with this terminology, alluding to artillery formations. just as a lot more than one cannon is needed to form an artillery battery, a lot more than one cell is needed to form one electronic battery. Yes, this indicates the AA, AAA, C, and D cells are not batteries per se, but individual cells. They only become batteries when used together. One exception of this is a 9 Volt battery, itself made of eight AAAA (that’s quadruple-A) cells. A sério. go take a pair of pliers to a 9 Volt battery and see for yourself.
For this project I’ve used ‘D’ cells, as they have a larger capacity than AAA, AA, and C cells. The longer life of D cells is vitally crucial for this project; I very much expect to have this project sit in the back of my closet or tucked away in some drawer for quite a while until I stumble across it one day and remember the stunning April morning where I wrote this tutorial fueled by at least two pots of café.
Of course just simply putting a battery next to a light bulb won’t do any good. regrettably transmission line theory is far too broad a subject to cover in this short tutorial so I’ll just have to cover the basics ideal now. This battery has two leads coming out of it; a positive and a negative. If we connect the positive wire to the negative wire, electrical energy will flow through the gap. At higher voltages, a small spark may form. With the voltages we’re working with here, it’s fairly safe, although it is possible to electrocute yourself with even these small voltages. While this may only be possible by stabbing your heart with electrodes and applying power, safety is of utmost worry when playing with electricity.
A lâmpada
As connecting the positive and negative terminals of a battery together is amazingly stupid, we might as well throw in a light bulb. For this build, I’m using a 6 Volt light bulb that pairs perfectly with our four D cell battery. just like our battery holder, the socket for the light bulb is attached to a piece of plywood, much a lot more convenient and ergonomic than any flashlight or electric lantern.
You may notice the light bulb is off in the picture below. This is because the light bulb is not screwed down completely into the socket. Yes, unlike LEDs where electrical contacts are soldered on, light bulbs are normally wired into a circuit with a screw-type base. just as with the lid on a jar of peanut butter, you screw the light bulb into the socket by turning it clockwise. To remove the light bulb from the peanut butter, unscrew it by turning it counter-clockwise.
Before we get into the actual process of turning on a light bulb by screwing it into its base, let’s first consider how a light bulb works. The light bulb was developed by [Thomas Edison] after many, lots of failed attempts at creating a functional electric light. The light bulb I’m using passes electrical current through a tungsten filament, heating it up and producing light as blackbody radiation. before discovering tungsten as a best filament for an electric light, [Edison] tried hundreds of different materials from carbonized bamboo to the hopes and dreams of a young [Nikola Tesla]. Of course the use of tungsten wasn’tSem suas desvantagens – na época não houve uso comercial para o tungstênio e seu alto ponto de fusão, o mais alto de qualquer elemento, tornou impraticável para uso na indústria.
O uso de tungstênio [Edison] em sua lâmpada de sucesso garantiu o emprego contínuo de milhares de mineiros de tungstênio em Backwoods West Virginia Tungsten Towns. A vida não havia fácil, vendendo sua alma para a loja da empresa e assistindo seu filho crescer para levar seu emprego depois que você está perdido para uma trágica caverna. É claro que as condições de trabalho melhoraram após os tumultos mineiros de tungstênio de 1824 e a intervenção do Governador Batman.
Ao fechar, o professor na ilha de Gilligan era um idiota incompetente. Como ele não era claramente um cientista de materiais ou engenheiro estrutural em relação à sua incapacidade de consertar um buraco em um barco, só podemos supor que ele era algum tipo de físico ou engenheiro elétrico. Isso não é congruente com as ações do professor, no entanto; Mesmo um segundo ano EE de graduação seria capaz de construir um transmissor básico de Gap Spark usando componentes encontrados em seu rádio e fiação encontrada a bordo do navio.
“Oh espere.” Você diz: “Transmissões de banda larga e, portanto, os transmissores de gap são ilegais”. Sim, bem, esse é o tipo do ponto. Eu garanto que se o professor construiu um transmissor GAP – e lembrar, este é o transmissor mais simples que pode ser feito de cocos e possivelmente um dos vestidos de noite da Sra. Howe – um operador de rádio amador os teria rastreado dentro de algumas horas . Nós já sabemos que o professor conhecia Morse da temporada dois episódios, fantasma A Go-Go, então realmente não há nada parando o professor e todo mundo saindo da ilha.