Printer, engine, driver, module, radiator, 3D printing, A4988

product description:
Introduce video:http://v.youku.com/v_show/id_XNjExNTMwMjA4.html  
Technical support and guarantee:
   100% consistent with the official Wiki product!PCB source file http://reprap.org/wiki/Stepstick.
The power -on test will be performed before delivery to ensure that it can be formally used before shipping. 
Special Note:

   According to the strong reaction of the user, change Rs from 0.2 ohms to 0.1 ohms, so that the maximum driving current can support 2A.
        
Feature advantages:
 1. The PCB copper clad process has been upgraded to 2oz (copper skin thickness is 70um, ordinary one is 35um), with higher copper content and better heat dissipation performance.
 2. The needle is welded and the gold-plated needle is excellent in quality.
 3. Different batches of PCB have slightly different colors and excellent quality
    
Product parameters:

• Size: 1.5mmx2mm (for RAMPS, Ultimaker or other compatible boards);
• Weight: 3.7G 
• Driveable current: 2A (it is recommended to install the heat sink)
• Segmentation: 1, 1/2, 1/4, 1/8, 1/16
• Manufacturing process: SMT patch machine manufacturing, non -handmade welding, higher yield rate, more stable performance

Application scenario:

• You need to drive the step motor.
• It is a necessary module for building 3D printers, CNCs, engraving machines, etc.
• Supported 3D printers include Prusa Mendel, ultimaker, printbot, makerbot, etc.
• You can refer to the following UNO code to directly drive the motor

              
Core chip A4988 Introduction:
       A4988 is a DMOS micro -step drive with converter and overcurrent protection. This product can operate the dual -step motor in full, half, 1/4, 1/8, and 1/16 step mode, output drive performanceCan reach 35 V and±2. The A4988 includes a fixed -off time current voltage regulator, which can work in a slow or mixed attenuation mode.The converter is the key to the easy implementation of A4988.Just enter a pulse in the "step" input, you can drive the motor to generate microscopic steps.There is no need to perform phase sequence tables, high -frequency control rows or complex interface programming.The A4988 interface is very suitable for complex microprocessors that are not available or overloaded.
             
Features of A4988:
1. Step motor for driving 8V ~ 35V 2A;
2. There are only simple steps and direction control interfaces;
3. Five different step modes: full, half, 1/4, 1/8, and 1/16;
4. The adjustable potentiometer can adjust the maximum current output to obtain a higher step rate;
5, automatic current attenuation mode detection/selection;
6. Overheating shutdown circuit, under pressure lock, cross -current protection;
7. Short -circuit protection and loading short -circuit protection
            
Used as a 3D printer, a supporting circuit module:

• UNO 2560   
• CPU core board 
• Ramps1.4 main control board 
• A4988 Driven Board Step Motor Drive Module (4 single heads, 5 tablets) 
• LCD liquid crystal controller can be controlled by LCD LCD, SD card offline printing (optional) 

Use UNO to directly control the motor usage:

As follows, UNO controls STEP and DIR to brake A4988.

1A and 1B connect one group, 2A and 2B connect another group. Generally, 1a 2a is connected to the positive electrode, and 1b 2b is connected to the negative electrode, because the motors are different. It is best to try and see if the direction is correct after connecting. If it is not right, change the positive and negative.

Test code:

int dirPin = 8;

int stepperPin = 7;

 void setup()

{

pinMode(dirPin, OUTPUT);

pinMode(stepperPin, OUTPUT);

}

 void step(boolean dir,int steps)

{

digitalWrite(dirPin,dir);

delay(50);

for(int i=0;i<steps;i++){

digitalWrite(stepperPin, HIGH);

delayMicroseconds(800);

digitalWrite(stepperPin, LOW);

delayMicroseconds(800); }

}

 void loop()

{

step(true,1600);

delay(500);

step(false,1600*5);

delay(500);

}