At first, I saw a lot of professional projects could not be implemented due to their complexity. Then, I decided to see my product inspired by other projects, so I used Google Sketch Up 2017 Pro. Each part is designed to assemble each other in a particular order. Before assembled, I have to test parts and choose the right soldering iron, which is achieved by drawing a virtual finishing item as a guide. These figures show the actual intensive life size shape and the correct size of each part to select the correct soldering iron.
In the work, I have encountered some obstacles.
1. The arm is too heavy and cannot be held by a small stepper motor, and we secure it in the next version or laser cutting.
2. Since the model is made of plastic, the frictional force of the rotating base is very large, and the movement is not smooth. The first solution is to purchase a larger step motor capable of withstand weight and friction, then we redesigned the base to suit a larger stepper motor. In fact, the problem still exists, and the larger motor cannot solve the problem, because the friction between the two plastic surfaces next to us cannot adjust the potentiometer according to the percentage. The maximum rotational position is not the maximum current that the drive can provide. You must use the manufacturer's technique to measure the voltage while the rotating pan. Then, I completely changed the foundation design and installed a servo motor with a metal gear with a gear mechanism.
3. Voltage can be powered by the ARDUINO development board by DC power jack (7-12V), USB connector (5V) or development board. The voltage via 5V or 3.3V pin is bypassed the regulator, so we decided to purchase a special USB cable that supports the 5 volt voltage from the PC or any power supply. Therefore, stepper motors and other components can only work normally at 5 volts, and we fix the buck module in order to protect parts from any problem. The buck module is a buck converter (buck converter), is a DC-DC power converter that can reduce the voltage (simultaneous increasing current) from its input (power) to its output (load), and keep Stability or voltage.
After some modifications, we change the design of the model by minus the size of the arm and open a suitable hole on the servo motor gear as shown. During the test, the servo motor successfully rotated the weight 180 degrees, as it's high torque means that the mechanical device can withstand a larger load. The servo mechanism can output how many steering power depends on the design factor - the supply voltage, the axis speed, and the like. It is also very good to use I2C because it uses only two pins and you can place multiple I2C devices on the same two pins. Therefore, for example, you can place up to 8 LCD backpacks + LCD on both pins! Bad news is that you must use the Hardware I2C pin.
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The clamp is fixed by using a metal gear servo motor to withstand the weight of the soldering iron. Servo.attach (9,1000,2000); Servo.write (Constraint (Angle, 10, 160)); initially, we encountered an obstacle, that is, the motor's vibration and vibration, until we found a tricky code to constrain Angel. Because not all servers have a complete 180 degree rotation. Many people don't. Therefore, we have written a test to determine where the mechanical limit is. I prefer it to use Servo.write Microseconds instead of Servo.write because it allows you to use 1000-2000 as a basic range. Many servors will support values outside of the range of 600 to 2400. Therefore, we tried different values and view where to know that you have reached the limit. Then, only within these limits are kept writing. You can set these restrictions when using servo.attach (pin, min, max), find the true sport range, and ensure that the code will not try to push it to the end, constrain () Arduino function for this.
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