"The photons hits the photographic film, which captures the scenery taking place before it." The man explained.
Keith thought : 'Yeah, I already knew that, but how do we produce a photographic surface in the first place?'
Since several minutes, he was browsing through videos explaining the concept behind capturing images with a camera. However, he had only found explanations about the physics taking place when the image was captured. He had seen those so many times, yet he still did not know how to make a photosentitive film.
'Well, in case of doubt, always check the number one informative site.'
After searching for a bit, Keith had finally found out that silver halide was being used in old cameras.
However, he was more interested in photodiodes which could translate light radiation into electrical signal. For this kind of component, Keith needed materials like gallium or silicon but he knew he got the necessary inside his vault.
Moreover, he had already done basic diodes in the past and several other electrical components for his computer, thus he was feeling confident in his ability to make a digital camera. He logged into the game and immediately started working.
The next day, he had finished designing a photoreceptive captor and was on his way to make several of them. He needed a lot in order to create a functionnal camera, even thought it did not need to capture a large area.
The following weeks, Keith finished the product and improved a lot on it so it could be more sensitive to colors. Afterwards, he connected the camera to the system of a splitting conveyor belt so it could tell the later where to send the resources. To finish off the whole contraption, he started working on the filter's artificial intelligence.
It did not take that much time, as he already had a rough idea on how to make a program differentiate colors. Basically, the photodiodes would send more or less electrical power depending on the light's wave length. As every object reflected a different wave length thanks to its color, Keith simply change the conveyor's behaviour based on the electrical power output of the captors. For now, this way of handling things would suffice.
Thus, after nearly two months of development and production, Keith was finally ready to inaugurate his electricity-producing factory.
He was anticipating a lot : 'What if the camera explodes? Would I need to go for another week or so? And what if the power output is too low, would this mean I lost my time?'
Thankfully, he had already tested the conveyors and both of the coal generators so he knew those would not break instantly. With expectant eyes, Keith connected the factory to the electrical poles that made their way to his home in order to provide it with electricity.
At first, nothing seemed out of the ordinary. He entered the building and checked whether the conveyor belts were functioning or not. For a while, Keith witnessed the resources being tracted up the moving platforms and being accommodated to his storage area.
After a while, some coal pieces proceeded under the filter and got sent towards the generators.
With a sigh of relieve, Keith gloated : 'It works!'
However, after an hour of operation, the electrical poles started buzzing and sparks flew everywhere.
'The power is too high! Abort!'
Keith deactivated the whole factory before something went wrong and took some time to think about what just happened.
It seemed like the electicity production was a lot higher than the need of his machines, leading to an overvoltage of the electric line. Thanks to the ground wires he place here and there, nothing blew off as most of the surplus got evacuated.
Keith was shocked by the production of the facility, but he had to restrain it as long as he did not need that much electricity.
'Well, looks like I won't have to worry about power shortage for a while.'
With that done, Keith return home with his trusty buggy and started planning his next projects.
First of, he had thought of making a train connecting the factory to his base. This project would make the ride faster and easier as well as making it so that resources would be transported automatically to his base, supplying his automated crafting machines. In fact, he could be producing lots and lots of crafting materials while he was away with this solution.
Next on the list would be developing his base. He was feeling a little cramped here since he made so many machineries and because of his future project he would need a lot more space.
Finally, he was thinking of making an actual artificial intelligence that could take care of his base on its own. He could also use it to manage stocks while making it easier to make future designs and recipes, freeing some time in his schedule.
Of course, he knew this last project was a bit of a daydream because people started exploring this domain not so long ago. However, there were several checkpoints along the way that could prove useful to him, like a modern-day computer with a user interface that could help him manage stocks and recipes. Or even a simpler version of the artificial intelligence he wanted to accomplish.
Either way, Keith now had access to lots of energy and could finally resume working on innovations. As always, he was highly enthusiastic at this idea and with the sudden surge in motivation he started crafting the necessary materials for his next transportation method.
'I wonder how Midgard's citizens did develop since my last visit? I should watch the news from time to time. Maybe they did invent something good, who knows?'