Difference between revisions of "Microduino-Module Stepper"

Microduino-A4982

Microduino-Stepper is a DMOS micro-step drive with a converter and the function of overcurrent protection. It can be used to operate bipolar stepper motors in full, half,1/4,1/8 and 1/16 stepping modes.

Feature

• Easy to control；
• Four optional stepping modes：full, 1/2,1/4 and 1/16
• Perfect protection mechanism:
  • Overheating shutdown circuit, undervoltage lockout, overcurrent protection;
  • Grounding protection, load short-circuit protection;
• Adopt potentiometer to adjust the current;
• Automatic current decay mode detection / selection;
• Compliant with smoke-free fire (NSNF) specification (ET package);
• Unique set-in method,saving space.

Specifications

• Support the bipolar stepper motor;
• Just input a pulse for the "STEP", it will drives the motor to produce micro-step without the need for phase sequence tables, high frequency control lines, or complex interface programming;
• The maximum output current can be adjusted via potentiometer, resulting in a higher step rate;
• Four optional stepping modes：
  • full,1/2,1/4 and 1/16；

Electrical Specifications

• VCC voltage：
  • 3.3~5V
• VMOT voltage：
  • 6~25V
• Maximum operating current：
  • 1.4A
• Under the Low current sleep mode, the current is less than 10uA；
• Automatic current decay mode detection/selection;
• Overheating shutdown circuit, undervoltage lockout and overcurrent protection;
• Grounding and load short-circuit protection;

Pin Description

Microduino-A4982-Pinout

Document

Eagle PCB File:Microduino-A4982.zip

Main component

• Drive chip：A4982 File:A4980-Datasheet.pdf

• Drive principle of the stepper motor： File:Working principle of the stepper motor.pdf

Development

Arduino library and support package

• Microduino_Stepper_AccelStepper：https://github.com/Microduino/Microduino_Tutorials/tree/master/Microduino_Libraries/_04_Microduino_Stepper_AccelStepper
• Stepper motor wiring： File:Stepper motor wiring.pdf

Stepper motor wiring

• Stepper motor connects with Microduino Stepper：
  • Four-wire two-phase stepper motor has two sets of coils a, b, the coil resistance is very small, only several ohms. a and b are totally insulated from the group, not communicating. Measured with a multimeter, connectivity is a set;
  • After measured out, a set of coils connect to OUT1A, OUT1B, another coil connects to OUT2A, OUT2B.
• By changing the MS1 & MS2 to change the stepping mode (Microduino Stepper default is 1/16 step mode);

Application

Program download

Testing Program：File:Program Test A4982.zip

Stepper Simple Application

• Connect the Micorduino core module,Microduino A4982 and the stepper motor.
• Prepared hardware：Microduino FT232R、Microduino Core、Microduino A4982、Four-wire two-phase stepper motor、9V~12V power；
• Prepared software：Microduino provides testing program（Arduino part）、Arduino IDE（1.0 release upper）、AccelStepper library，
• Put the downloaded library to the libraries folder of the Arduino IDE installation folder;
• Strat Ardino IDE, open the testing program, card type chooses “Microduino Core (Atmega328P@16M,5V)”, download directly;
• Use the pegboard setting up the circuit: (blue line at the bottom),as following picture:

Pegboard wiring diagram

• Microduino Stepper drives a stepper motor：[ Test_A4982]
  • External 9V or 12V power supply, the motor does not rotate in initialization state;
  • Press the button, the stepper motor begins to rotate as setting speed, and LED indicator lights, reverse rotation after a few laps, the cycle repeated;
  • Press the button again to close the drive, LED indicator lights off. Key detection through an interrupt, turn the switch driver.

FAQ

• Does this module can drive DB motor?
  • No.

Pictures

Microduino A4982 Front

Microduino A4982 Back

Microduino A4982 Erection