Interesting homemade made by a student from Germany. This is a device that writes text on various surfaces, a road, a wall, in principle, even grass. In general, a master, an activist in the fight against climate change, and this device was made for an international climate strike, which was supposed to be, or was already in 2019.
Well, the master has his own goals, and we can use such a device for other purposes.
So, to make such a street printer, the master used the following
Tools and materials:
-Skateboard;
- Limit switch EATON LS-S11S-P;
-Arduino Uno;
16-channel PWM / Servo Shield Adafruit;
- TowerPro SG90 Servo Servomotor -8 pcs;
-Switch;
-Battery 9V;
-The wire;
-USB cable - 2 pcs;
- Poverbank 8000 mAh;
- Terminals;
-Springs;
-Boards;
-Aerosol containers with paint;
-Hammer;
-Nails;
Step One: Frame
The first step is to build a frame. The master measures the diameter of the aerosol can, in this case its size is 70 mm. Multiplies 70 X 8 = 560. That is, frame size 560 by 70 mm. The master knocks a box and nails the bottom rail so that the cylinders do not fall out. Spray guns must be removed from the cylinders. From a skateboard you need to cut a little board to a metal platform. Further, the frame is fixed on a skateboard. It all works like that. Servo drives are mounted. From them to the cylinders installed with the nozzle down, cables with rings on the end fit. The rings are put on the nozzles, the servo rotates, pulls the cable, the nozzles are recessed and paint is sprayed.
Step Two: electronics
The master installs servos, arduino. Connects.
Two pins are mounted on one of the rollers and, next to the trailer. The roller spins, the pin pushes the limit switch, and the program understands the distance the device has moved.
Step Three: Code
It remains to download the code. It can be downloaded below.
AZ_streetwriter_V1.ino
Step Four: Trouble
Not everything worked out right away. In the photo, the wizard shows some typical problems.
No spaces between characters were specified here.
Problems with the mechanics, cables, fastening of cylinders, etc.
Eating problems.
As a result, everything worked out and the printer worked as it should.
