Description
The video above is the actual function test process and test after each piece, we will do.
Brief introduction: http://v.youku.com/v_show/id_XNjExNTMwMjA4.html Ramp1.4.
Product Name: A4988 stepper motor driver board Reprap 3D printer StepStick compatible with Arduino
Special note: green board Rs for 0.1 euro, the maximum current 2A; red board Rs for 0.2 euro, the maximum current 1A.
The advantages of:
1, upgrade the quality does not increase, a large quantity favorably, welcome consultation.
2, the latest batch of chips.
3, PCB copper technology upgrade to 2oz (copper thickness is 70UM, average is 35um), the copper content is higher, better heat dissipation performance of course.
4, as the heat sink and double-sided silicone, please paste.
5, welded pin pin, gold-plated, excellent quality.
Parameter:
Size: 1.5mmX2mm (for RAMPS, ultimaker or other compatible board);
Can drive current: 2A (the best installation radiator, heat sink will be included, need to install)
Subdivision: 1, 1/2, 1/4, 1/8, 1/16
Manufacturing process: SMT machine manufacturing, non manual welding, the yield is higher, more stable performance
Suits the object:
To drive the stepper motor.
Is to build a 3D printer, CNC, engraving machine and other essential module.
Support 3D printer Prusa Mendel, ultimaker, printbot, makerbot etc..
You can refer to the back of the Arduino code, the direct drive motor
Shipping list:
1, the A4988 module (with needle)
2, as the heat sink and double-sided silicone, please paste
Technical support and guarantee:
The official Wiki product line and! PCB link to the source file: http://reprap.org/wiki/Stepstick.
Do the power test before delivery, which can be used to ship.
If you have any questions, welcome to put forward in the Baidu Post Bar: http://tieba.baidu.com/makerbase we will reply as soon as possible
Note: http://flyway97.blog.163.com/blog/static/2220320412013111910433463/
Welcome all friends to join the discussion group: 156492164.
Welcome to my blog: http://flyway97.blog.163.com
The core chip A4988:
A4988 is a DMOS converter and micro drive and overcurrent protection, the products can be in full, half, 1/4, 1/8 and 1/16 step mode of operation of bipolar stepper motor driver, the output performance of up to 35 V and + 2, A4988 includes a fixed off time current regulator, the regulator can work in the slow or mixed decay mode. A4988 converter is the key to the easy implementation. As long as the input of a pulse in the “step” in the input can be driven motor, microstep. There are no phase sequence tables, high frequency control interface programming or complex. The application of A4988 interface is very suitable for complex microprocessor is not available or overload.
A4988 has the following characteristics:
1, suitable for 8V~35V under 2A drive stepper motor;
2, only a simple step and direction control interface;
3, five different step mode: full, half, 1/4, 1/8 and 1/16;
4, adjustable potentiometer can be adjusted so as to obtain the maximum output current, high stepping rate;
5, automatic current decay mode detection / choice;
6, overheating closed circuit, undervoltage lockout, and crossover current protection;
7, short circuit protection and load short-circuit protection
As a 3D printer, the circuit module supporting the need:
Arduino 2560 CPU core board
Ultimaker v1.5.7 main control board
A4988 driver board, stepper motor drive module (single 4, double 5)
LCD LCD controller LCD LCD control, SD card offline printing (optional)
Use Arduino to control the motor directly:
The connection is as follows, UNO control STEP and DIR can brake A4988.
Between VDD and GND in the device logic voltage power supply +5V power supply is connected to the Arduino terminal of the US, and between the motor power supply VMOT and GND we need to connect the 8-15V (DC); and on the three mode MS1, MS2, MS3 at the end of all of our earth is full step mode (turn to the 200 step in value or a step of 1.8 degrees), if the requirements of higher precision, we can choose other modes, for example, if we choose 1/4 stepper motor model, then we turn to send the 800 step can be completed.
The relationship between MS1, MS2, and MS3
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);
}
电流调节方法：
a4988的驱动电流算法：itripmax = vref / ( 8 x rs)，电位器有三个引脚，用万用表测试面向4988方向的引脚的电压为Vref
可通过电位器调节电流，顺时针拧是增大电流，逆时针是减小电流。
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