// Example for M5Stack StepMotor Module (I2C verison)
// 2018/6/27 JimmyLai
#include 
#include 

void setup() {
  // put your setup code here, to run once:
  M5.begin();
  Wire.begin();
  Serial.begin(115200);
  m5.Lcd.setTextColor(WHITE, BLACK);
  m5.Lcd.setTextSize(2);
  m5.lcd.setBrightness(100);
  M5.Lcd.setCursor(4, 10);
  M5.Lcd.println("StepMotor Test: 0x70/0x71");
  M5.Lcd.setCursor(4, 30);
  M5.Lcd.println("Press A: 0x70");
  M5.Lcd.setCursor(4, 50);
  M5.Lcd.println("Press B: 0x71");
}

void SendByte(byte addr, byte b) {
  Wire.beginTransmission(addr);
  Wire.write(b);
  Wire.endTransmission();
}

void SendCommand(byte addr, char *c) {
  Wire.beginTransmission(addr);
  while ((*c) != 0) {
    Wire.write(*c);
    c++;
  }
  Wire.write(0x0d);
  Wire.write(0x0a);
  Wire.endTransmission();
}

void loop() {
  if (digitalRead(39) == LOW)  // A button
  {
    while (digitalRead(39) == LOW) delay(1);
    SendCommand(0x70, "G1 X0Y0Z200 F500");
    while (digitalRead(39) == HIGH) delay(1);
    SendCommand(0x70, "G1 X0Y0Z0 F0");
  

  }
  // Get Data from Module.
  Wire.requestFrom(0x70, 1);
  if (Wire.available() > 0) {
    int u = Wire.read();
    if (u != 0) Serial.write(u);
  }
  Wire.requestFrom(0x71, 1);
  if (Wire.available() > 0) {
    int u = Wire.read();
    if (u != 0) Serial.write(u);
  }
  delay(1);
  // Send Data to Module.
  while (Serial.available() > 0) {
    int inByte = Serial.read();
    SendByte(0x70, inByte);
    SendByte(0x71, inByte);
  }
}

• Possibility to use TMC2130 in SPI mode without wires. The SPI bus is already connected to the drivers on the PCB.
• 12-26V DC power supply;
• Number of installed drivers for form factor Pololu — 6;
• The total number of outputs for connection to the load via the MOSFET — 7;
• Outputs for connection of hotends— 3;
• Low-power outputs for connection of controlled fans – 2;
• Outputs for connection of Heated Bed or Chamber heater (powerful IRL1404 installed). When connecting 2 MK2b tables to one channel — cold) – you can connect large tables, two-zone table from Cheap3D, or several simultaneously;
• Inputs for connection of thermistors – 5;
• Outputs for servo connection – 2;
• Possibility to connect external 5V power supply for servos;
• A connector for connecting the wifi module ESP8266-01;
• Ability to connect external 3.3 V power for WiFi module ESP8266;
• EEPROM chip;
• The displays the RepRap Discount Controller series connect to board without the adapter;
  Separate connector for MKS TFT and Nextion displays;
• Optional amplifiers for connection of 2 K-type thermocouples are installed.

full.jpg

• Control the 12 stepper controllers have to run 1 water pomp (18W @150rpm) and max 6 small pumps (<10W @100RPM max), all whit 200 steps steppers.
• Connected to com 2 will be a serial display.
• To the analog pins will be connected two temp sensors, and two load cell's for pump calibration(1).
• To the digital pins will be connected some relays to control some valves and to control other electrical equipment.
• The relay is at the bottom is to cut power to the drivers.

• Is the design solid, as this is my verry first circuit board design, and properly could still use some improvements.
• Can i use a relay to cut main power to the drivers, as i read somewhere that cutting power could maybe destroy your Arduino, i want to do this because this is running 24/7, and i want to save power, as i don't need to keep power on the stepper to hold him in place, as i only need precise control when the pump is running, a couple of steps movement is irrelevant for my use, but maybe there is a other way to save power?
• I wane use TMCxxxx drivers, from what i read, i like the TMC2208 the best, but is this the best for my use?