STEP/DIR SIGNAL TO CW/CWW SIGNAL CONVERTER FOR CNC & MOTION CONTROL SYSTEMS

Rajkumar Sharma
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medium
Tested

Simple Circuit converts Step/Dir. signal into to double drive CW/CWW Pulse, Mach3 and few Hobby CNC software’s provides Step/Direction pulse output to drive stepper motor drivers.

Various AC servo works with double CW/CCW pulse. This circuit is solution to interface such AC CW/CCW pulse based driver with Mach3 or other CNC software’s. Circuit designed around 7408 and 7404 IC, board support 5V or 24V supply. Open Collector output can be interface with 24V system by changing output resistors.

Features

Supply 7V 24V DC
On Board Power LED
Inputs and Outputs Header Connector
On Board ERTH (Earth) Signal provided for chassis ground to avoid any noise

Note : Output Transistor can drive Stepper Drive or Servo driver Opto-couplers directly , choose appropriate collector resistor value for 5V or 24V

R3,R5,R9 470 Ohms for 5V DC Open Collector Output
R3,R5,R9 2K2 Ohms for 24V DC Open Collector Output

Inputs:

Step Pulse ( TTL 5V)
Direction Pulse ( TTL 5V)
Enable Signal ( TTL 5V )

Outputs:

CW (5V Or 24V Open Collector)
CWW ( 5V Or 24V Open Collector )
Enable ( 5V Or 24V Open Collector )

Schematic

Parts List

Signal Diagram

PCB

Downloads

STEP-DIR-SIGNAL-TO-CW-CWW-SIGNAL-CONVERTER.pdf

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9 Comments

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adsd

3 years ago

Thanks , great info and share , realy heplfull .

Lelo

3 years ago

Thanks a lot !! but i have a question, What is the value of the resistors R21 and R22 in the bottom side ? I do not found on list.

Lelo

Reply to Lelo

3 years ago

I get it, in truth they are the resistors 1 and 2. thanks !

Manu

2 years ago

Hi,
Where we can buy this board?

mechatronicer

8 months ago

I simply used a second arduino to convert dir/step signals to cw/ccw. Could not be simpler. Tried it with GRBL controlling a VEXTA 5-phase driver. Works!

Here’s the code:

int IN_GRBL_DIR = 3;
int IN_GRBL_STEP = 4;
int OUT_VEXTA_CW = 5;
int OUT_VEXTA_CCW = 6;
int ledPin = 13; // to test light led when cw is on

void setup() {
pinMode(IN_GRBL_DIR,INPUT);
pinMode(IN_GRBL_STEP,INPUT);
pinMode(OUT_VEXTA_CW,OUTPUT);
pinMode(OUT_VEXTA_CCW,OUTPUT);
pinMode(ledPin,OUTPUT);
}

void loop() {
int step;
int cw;
int ccw;

step = digitalRead(IN_GRBL_STEP);
if (digitalRead(IN_GRBL_DIR)==LOW) {
cw = step;
ccw = 0;
digitalWrite(ledPin,HIGH);
} else {
cw = 0;
ccw = step;
digitalWrite(ledPin,LOW);
}
digitalWrite(OUT_VEXTA_CW,cw);
digitalWrite(OUT_VEXTA_CCW,ccw);
}