Adding stepper motor to tasmota, to control blinds

[Kim Skatun]

Hi,

So i have 3dprinted some parts to electrify my ikea roller blinds. They uses a small 5-12v stepeprmotor driven by uln2003 stepper board, now I would like to expend the tasmota softaware to include this. Below is my attempt, but I do not know how to get the MQTT messages into my arduino sketch, any tips would be great:

#include <Stepper.h>

int STEPS_PER_MOTOR_REVOLUTION=200;

int MOTOR_SPEED = 20;

int PINA;

int PINB;

int PINC;

int PIND;

Stepper small_stepper;

// FROM WEBserver  Selection pinA,pinB,pinC,pinD

void init(int pinA,int pinB,int pinC,int pinD) {

  // Declare 'small_stepper' variable

  PINA=pinA;

  PINB=pinB;

  PINC=pinC;

  PIND=pinD;

  

  small_stepper(STEPS_PER_MOTOR_REVOLUTION, PINA, PINB, PINC, PIND);

}

// FROM MQTT STEPS_PER_MOTOR_REVOLUTION XXX

void setRev(int rev){

  STEPS_PER_MOTOR_REVOLUTION=rev;

  small_stepper = nothing;

  small_stepper(STEPS_PER_MOTOR_REVOLUTION, PINA, PINB, PINC, PIND);

}

// FROM MQTT SPEED XXX

void setSpeed(int speed){

  MOTOR_SPEED=speed;

  small_stepper.setSpeed(MOTOR_SPEED); 

}

// FROM MQTT SPEED 

int getSpeed(){

  return MOTOR_SPEED;

}

// FROM MQTT STEP XXX

void moveNumberOfSteps(int steps)

  small_stepper.step(steps);

}

// FROM MQTT STEP +

void moveForward()

  small_stepper.step(STEPS_PER_MOTOR_REVOLUTION);

}

// FROM MQTT STEP -

void moveBackward()

  small_stepper.step(-STEPS_PER_MOTOR_REVOLUTION);

}

[Phil]

Enter code here.../*

 Basic MQTT example

 This sketch demonstrates the basic capabilities of the library.

 It connects to an MQTT server then:

  - publishes "hello world" to the topic "outTopic"

  - subscribes to the topic "inTopic", printing out any messages

    it receives. NB - it assumes the received payloads are strings not binary

 It will reconnect to the server if the connection is lost using a blocking

 reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to

 achieve the same result without blocking the main loop.

 

*/

#include <SPI.h>

#include <Ethernet.h>

#include <PubSubClient.h>

// Update these with values suitable for your network.

byte mac[]    = {  0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };

IPAddress ip(172, 16, 0, 100);

IPAddress server(172, 16, 0, 2);

void callback(char* topic, byte* payload, unsigned int length) {

  Serial.print("Message arrived [");

  Serial.print(topic);

  Serial.print("] ");

  for (int i=0;i<length;i++) {

    Serial.print((char)payload[i]);

  }

  Serial.println();

}

EthernetClient ethClient;

PubSubClient client(ethClient);

void reconnect() {

  // Loop until we're reconnected

  while (!client.connected()) {

    Serial.print("Attempting MQTT connection...");

    // Attempt to connect

    if (client.connect("arduinoClient")) {

      Serial.println("connected");

      // Once connected, publish an announcement...

      client.publish("outTopic","hello world");

      // ... and resubscribe

      client.subscribe("inTopic");

    } else {

      Serial.print("failed, rc=");

      Serial.print(client.state());

      Serial.println(" try again in 5 seconds");

      // Wait 5 seconds before retrying

      delay(5000);

    }

  }

}

void setup()

{

  Serial.begin(57600);

  client.setServer(server, 1883);

  client.setCallback(callback);

  Ethernet.begin(mac, ip);

  // Allow the hardware to sort itself out

  delay(1500);

}

void loop()

{

  if (!client.connected()) {

    reconnect();

  }

  client.loop();

}

 

found in the pubsubclient arduino examples shows how to subscribe to a mqtt topic and receive the payload.. 

the tasmota payload is a json object  so check out the arduino json library examples for a roadmap on handling that.  

     

 

 

[Kim Skatun]

Thanks Phil,

however I would like to add it to the Tasmota server so that everyone can choose stepper motor as a sensor. The code you supplied were for standalone MQTT and not on how to integrate my sensor into tasmota. I will keep looking :)

 

 

[Philip Knowles]

You need to talk to Theo and add as a Pull Request in the Tasmota GitHub.

 

Regards

 

Phil K

 

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[Kim Skatun]

Well before I can do a pull request I need a working code, and I need some help as stated to figure out how to parse the MQTT messages, or rather how to structure a new sensor.

[Ken McMullan]

Did this project gain any ground? I found it as I now also have the objective of adding a stepper motor to TASMOTA, and am also struggling with the architecture.

[Phil]

I dont know if the pull request was even made? 

atm i think the quickest route to results would be lifting one of the many esp8266-mqtt-stepper motor projects already out there

https://www.google.com/search?q=esp8266+mqtt+stepper+motor&oq=esp8266+mqtt+stepper+motor&aqs=chrome..69i57.13291j0j7&sourceid=chrome&ie=UTF-8

and including the new device mqtt options within your tasmota system 

a probable obstacle to including in tasmota is the range of different driver options and control methods but i am theorising as my coding is limited to lift and superficial edit these days.