Those masters who work with epoxy know how important it is to stir it correctly. On the one hand, you need to mix its components well, on the other hand, if you mix it incorrectly, the resin is saturated with air bubbles. In the future, products made from such resin are of poor quality, and additional operations must be carried out to remove air bubbles.
In this article, the master will tell us how he made an epoxy mixer. On the mixer, you can adjust the speed of revolutions and thus minimize the saturation of the resin with air.
Tools and materials: -Glue gun;
-Insulating tape; -Double-sided tape; -Epoxy resin; -Arduino UNO ; -Motor controller L298n; -Motor RS 550; -Jumpers; -Wires; -Plastic box; -Switch; -Potentiometer; -Potentiometer knob;
-LCD screen with i2c (16×2);
-Power supply 12 V, 2 A;
-PVC-cap 110 mm;
-PVC-caps 40 mm – 2 pcs;
-PVC pipe 40 mm, 3 cm long;
-Drill 4 mm;
-LED ceiling lamp;
Step one: housing
The master makes a housing for electronics from a plastic box. The box should be roomy enough to add an Arduino, an L298n motor controller, and an LCD screen inside. The master used a transparent plastic container for food. The master painted the case with black paint.
3 holes need to be drilled in the case:
1st hole – wires for power and motor
2nd hole – for potentiometer
3rd hole – for switch < br>The boards are fixed with double-sided tape, the potentiometer with a nut.
Step two: cover
After preparing the case, you need to make a cover. The master makes the cover from acrylic. First you need to cut it to size, then cut a hole for the screen. The screen is fixed with hot glue.
Step three: making motor housing
The master uses an RS 550 motor as a motor. To avoid contact of the epoxy resin with the motor, the master made the motor casing from PVC pipe.
We need two plugs with a diameter of 40 mm. Three holes must be drilled in one of the plugs: two for attaching to the motor, and one for the motor shaft. In the other plug, you need to make a hole for the wire.
The wire is pulled into the hole and its ends are soldered to the engine contact pads. Then both plugs are installed in place, and glue is applied to the docking part.
Step four: making nozzles
Next you need to make a nozzle that will mix the epoxy resin.
The master installs a coupling on the motor shaft. The drill is attached to the sleeve.
Then he takes apart the ceiling light. The luminaire has a comb-shaped radiator. This will be the nozzle. The master fixes it at the end of the drill using the propeller attachment piece used in aircraft modeling.
Step five: mixing container
The epoxy mixing container is made of PVC pipes and PVC plugs with a diameter of 110 mm.
You just need to cut the pipe to the desired length and then glue the plug to it on one side.
Step six: scheme connections
The connection diagram is as follows:
LCD screen & gt; & gt; Arduino
VCC & gt; & gt; 5V
GND & gt; & gt; GND
SCL & gt; & gt; A5
SDA & gt; & gt; A4
Potentiometer & gt; & gt; Arduino
Medium Pin & gt; & gt; A0
Remaining pins & gt; & gt; 5v and GND.
L298n Motor Controller & gt; & gt; Arduino
ENA & gt; & gt; 6
Pin1 & gt; & gt; 5
Pin 2 & gt; & gt; 4
GND & gt; & gt; GND
5B & gt; & gt; 5B
Power supply L298n & gt; & gt; Power supply 12 V, 2A
The motor is connected to the output terminals of L298n
Step seven: programming
You need to download the code on the Arduino. This is the code to control the speed of the motor. When the potentiometer value is changed, the motor speed also changes. The motor speed is displayed on the LCD screen as a percentage (0% to 100%). The code can be downloaded below.
#include #include LiquidCrystal_I2C lcd (0x27,20,4); int speed1 = 0; int speed2 = 0; int motorpin1 = 5; int motorpin2 = 4; int ENA = 9; void setup () & # 123; lcd.init (); lcd.init (); lcd.backlight (); pinMode (motorpin1, OUTPUT); pinMode (motorpin2, OUTPUT); pinMode (ENA, OUTPUT); lcd.setCursor (4.0); lcd.print (& # 34; Welcome! & # 34;); lcd.setCursor (0,1); lcd.print (& # 34; Epoxy Glue Mixer & # 34;); delay (3000); lcd.clear (); } void loop () & # 123; speed1 = map (analogRead (A0), 0.1024,0,100); speed2 = map (analogRead (A0), 0.1024,0,255); lcd.setCursor (0,0); lcd.print (& # 34; *** Speed = & # 34;); lcd.setCursor (10,0); lcd.print (speed1); lcd.setCursor (12,0); lcd.print (& # 34;% * & # 34;); lcd.setCursor (3,1); lcd.print (& # 34; Max-5Mins & # 34;); analogWrite (ENA, speed2); digitalWrite (motorpin1, HIGH); digitalWrite (motorpin2, LOW); }
The mixer is ready only to test it. The master loads a small amount of epoxy and hardener into the container. Then sets the potentiometer knob to zero position. Includes mixer. Using the potentiometer, sets the optimal number of revolutions.