Fire Truck Special (2014)
I thought about an idea to build something with a water pump for a while. Since the water pump is quite expensive I decided to build my own one. So, I bought a child water pistol and removed the pump using a small hammer. Then, I updated its inner spring so it is easier to push it. The pump is controller using a continuous servo motor with a mechanism based on car’s wipers. The water pump gave me a lot of hard time as for construction. In the end I choose the mechanism with a string that pushes a lever pressing the piston with a spring.
Having the water pump build I thought about something to integrate it into. The choice was to build a fire truck. Searching the internet I found quite nice airport special fire truck that inspired me. I started the construction from the arm that is crucial for the truck. The first version of the arm was sturdy but rather heavy. Thus, I dismantle it and build a light-weighted version instead.
The construction continued with the truck itself. First, I created a rough base construction with wheels, drive and steering servo. Then, I constructed front and back of the car with lights. Finally, I created a cabin that sustains the entire arm mounting.
I decided to put the water pump to the truck’s chassis. All that remained was a water tank. There left only little space thanks to the peripherals. But I managed to come up with a refined solution. I took a tube from fuzzy tablets, than I made a hole in the bottom and glued an aquarium tube connector inside. I covered the entire tube using a black scotch tape so it fitted to the car design.
After I put all the peripherals inside the car I started to write a code for the microprocessor. Since I put a temperature and illumination level sensor to the truck’s arms, I forced myself to finish a part of my own transfer protocol for the universal remote controller. So, I finally implemented the part that can process and display message send from the end device. You can see it in the video bellow.
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