Hi everyone!
So i have a bit of a problem with controlling my stepper motor via blynk. I have a Wemos d1 mini as my esp8266 module which is hooked up to my wifi. I currently have it hooked up to websocket from where i can control the stepper motor using a slider. But i would like to be able to control it using Blynk instead.
I have managed to connect it to blynk but do not now how i can control it using a slider or button. The idea is to have it connected to two buttons in the blink app one to spin one way and one to spin the other way.
The project is for automated Blinds.
The motor takes an input from 0 - 100 and 1 is spinning one way and -1 one is spinning the other way and 0 is stop.
I have read around on other topics on this problem and tried a couple but non of them seemed to work.
If anyone have any inputs or help they can provide it would be highly appreciated 
Thanks ahead
Here is the code used:
#include <Stepper_28BYJ_48.h>
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <PubSubClient.h>
#include <WiFiUdp.h>
#include <WiFiManager.h>
#include <ArduinoJson.h>
#include "FS.h"
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <WebSocketsServer.h>
#include <ArduinoOTA.h>
#include "NidayandHelper.h"
#include "index_html.h"
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
//--------------- CHANGE PARAMETERS ------------------
//Configure Default Settings for Access Point logon
String APid = "BlindsConnectAP"; //Name of access point
String APpw = "nidayand"; //Hardcoded password for access point
//----------------------------------------------------
// Version number for checking if there are new code releases and notifying the user
String version = "1.3.1";
NidayandHelper helper = NidayandHelper();
//Fixed settings for WIFI
WiFiClient espClient;
PubSubClient psclient(espClient); //MQTT client
char mqtt_server[40]; //WIFI config: MQTT server config (optional)
char mqtt_port[6] = "1883"; //WIFI config: MQTT port config (optional)
char mqtt_uid[40]; //WIFI config: MQTT server username (optional)
char mqtt_pwd[40]; //WIFI config: MQTT server password (optional)
String outputTopic; //MQTT topic for sending messages
String inputTopic; //MQTT topic for listening
boolean mqttActive = true;
char config_name[40]; //WIFI config: Bonjour name of device
char config_rotation[40] = "false"; //WIFI config: Detault rotation is CCW
String action; //Action manual/auto
int path = 0; //Direction of blind (1 = down, 0 = stop, -1 = up)
int setPos = 0; //The set position 0-100% by the client
long currentPosition = 0; //Current position of the blind
long maxPosition = 2000000; //Max position of the blind. Initial value
boolean loadDataSuccess = false;
boolean saveItNow = false; //If true will store positions to SPIFFS
bool shouldSaveConfig = false; //Used for WIFI Manager callback to save parameters
boolean initLoop = true; //To enable actions first time the loop is run
boolean ccw = true; //Turns counter clockwise to lower the curtain
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "**************************";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Podian123";
char pass[] = "**********";
Stepper_28BYJ_48 small_stepper(D1, D3, D2, D4); //Initiate stepper driver
ESP8266WebServer server(80); // TCP server at port 80 will respond to HTTP requests
WebSocketsServer webSocket = WebSocketsServer(81); // WebSockets will respond on port 81
bool loadConfig() {
if (!helper.loadconfig()){
return false;
}
JsonVariant json = helper.getconfig();
//Store variables locally
currentPosition = long(json["currentPosition"]);
maxPosition = long(json["maxPosition"]);
strcpy(config_name, json["config_name"]);
strcpy(mqtt_server, json["mqtt_server"]);
strcpy(mqtt_port, json["mqtt_port"]);
strcpy(mqtt_uid, json["mqtt_uid"]);
strcpy(mqtt_pwd, json["mqtt_pwd"]);
strcpy(config_rotation, json["config_rotation"]);
return true;
}
/**
Save configuration data to a JSON file
on SPIFFS
*/
bool saveConfig() {
StaticJsonBuffer<200> jsonBuffer;
JsonObject& json = jsonBuffer.createObject();
json["currentPosition"] = currentPosition;
json["maxPosition"] = maxPosition;
json["config_name"] = config_name;
json["mqtt_server"] = mqtt_server;
json["mqtt_port"] = mqtt_port;
json["mqtt_uid"] = mqtt_uid;
json["mqtt_pwd"] = mqtt_pwd;
json["config_rotation"] = config_rotation;
return helper.saveconfig(json);
}
/*
Connect to MQTT server and publish a message on the bus.
Finally, close down the connection and radio
*/
void sendmsg(String topic, String payload) {
if (!mqttActive)
return;
helper.mqtt_publish(psclient, topic, payload);
}
/****************************************************************************************
*/
void processMsg(String res, uint8_t clientnum){
/*
Check if calibration is running and if stop is received. Store the location
*/
if (action == "set" && res == "(0)") {
maxPosition = currentPosition;
saveItNow = true;
}
/*
Below are actions based on inbound MQTT payload
*/
if (res == "(start)") {
/*
Store the current position as the start position
*/
currentPosition = 0;
path = 0;
saveItNow = true;
action = "manual";
} else if (res == "(max)") {
/*
Store the max position of a closed blind
*/
maxPosition = currentPosition;
path = 0;
saveItNow = true;
action = "manual";
} else if (res == "(0)") {
/*
Stop
*/
path = 0;
saveItNow = true;
action = "manual";
} else if (res == "(1)") {
/*
Move down without limit to max position
*/
path = 1;
action = "manual";
} else if (res == "(-1)") {
/*
Move up without limit to top position
*/
path = -1;
action = "manual";
} else if (res == "(update)") {
//Send position details to client
int set = (setPos * 100)/maxPosition;
int pos = (currentPosition * 100)/maxPosition;
sendmsg(outputTopic, "{ \"set\":"+String(set)+", \"position\":"+String(pos)+" }");
webSocket.sendTXT(clientnum, "{ \"set\":"+String(set)+", \"position\":"+String(pos)+" }");
} else if (res == "(ping)") {
//Do nothing
} else {
/*
Any other message will take the blind to a position
Incoming value = 0-100
path is now the position
*/
path = maxPosition * res.toInt() / 100;
setPos = path; //Copy path for responding to updates
action = "auto";
int set = (setPos * 100)/maxPosition;
int pos = (currentPosition * 100)/maxPosition;
//Send the instruction to all connected devices
sendmsg(outputTopic, "{ \"set\":"+String(set)+", \"position\":"+String(pos)+" }");
webSocket.broadcastTXT("{ \"set\":"+String(set)+", \"position\":"+String(pos)+" }");
}
}
void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length) {
switch(type) {
case WStype_TEXT:
Serial.printf("[%u] get Text: %s\n", num, payload);
String res = (char*)payload;
//Send to common MQTT and websocket function
processMsg(res, num);
break;
}
}
void mqttCallback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
String res = "";
for (int i = 0; i < length; i++) {
res += String((char) payload[i]);
}
processMsg(res, NULL);
}
/**
Turn of power to coils whenever the blind
is not moving
*/
void stopPowerToCoils() {
digitalWrite(D1, LOW);
digitalWrite(D2, LOW);
digitalWrite(D3, LOW);
digitalWrite(D4, LOW);
}
/*
Callback from WIFI Manager for saving configuration
*/
void saveConfigCallback () {
shouldSaveConfig = true;
}
void handleRoot() {
server.send(200, "text/html", INDEX_HTML);
}
void handleNotFound(){
String message = "File Not Found\n\n";
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_GET)?"GET":"POST";
message += "\nArguments: ";
message += server.args();
message += "\n";
for (uint8_t i=0; i<server.args(); i++){
message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
}
server.send(404, "text/plain", message);
}
void setup(void)
{
Serial.begin(115200);
delay(100);
Serial.print("Starting now\n");
Blynk.begin(auth, ssid, pass);
//Reset the action
action = "";
//Set MQTT properties
outputTopic = helper.mqtt_gettopic("out");
inputTopic = helper.mqtt_gettopic("in");
//Set the WIFI hostname
WiFi.hostname(config_name);
//Define customer parameters for WIFI Manager
WiFiManagerParameter custom_config_name("Name", "Bonjour name", config_name, 40);
WiFiManagerParameter custom_rotation("Rotation", "Clockwise rotation", config_rotation, 40);
WiFiManagerParameter custom_text("<p><b>Optional MQTT server parameters:</b></p>");
WiFiManagerParameter custom_mqtt_server("server", "MQTT server", mqtt_server, 40);
WiFiManagerParameter custom_mqtt_port("port", "MQTT port", mqtt_port, 6);
WiFiManagerParameter custom_mqtt_uid("uid", "MQTT username", mqtt_uid, 40);
WiFiManagerParameter custom_mqtt_pwd("pwd", "MQTT password", mqtt_pwd, 40);
WiFiManagerParameter custom_text2("<script>t = document.createElement('div');t2 = document.createElement('input');t2.setAttribute('type', 'checkbox');t2.setAttribute('id', 'tmpcheck');t2.setAttribute('style', 'width:10%');t2.setAttribute('onclick', \"if(document.getElementById('Rotation').value == 'false'){document.getElementById('Rotation').value = 'true'} else {document.getElementById('Rotation').value = 'false'}\");t3 = document.createElement('label');tn = document.createTextNode('Clockwise rotation');t3.appendChild(t2);t3.appendChild(tn);t.appendChild(t3);document.getElementById('Rotation').style.display='none';document.getElementById(\"Rotation\").parentNode.insertBefore(t, document.getElementById(\"Rotation\"));</script>");
//Setup WIFI Manager
WiFiManager wifiManager;
//reset settings - for testing
//clean FS, for testing
//helper.resetsettings(wifiManager);
wifiManager.setSaveConfigCallback(saveConfigCallback);
//add all your parameters here
wifiManager.addParameter(&custom_config_name);
wifiManager.addParameter(&custom_rotation);
wifiManager.addParameter(&custom_text);
wifiManager.addParameter(&custom_mqtt_server);
wifiManager.addParameter(&custom_mqtt_port);
wifiManager.addParameter(&custom_mqtt_uid);
wifiManager.addParameter(&custom_mqtt_pwd);
wifiManager.addParameter(&custom_text2);
wifiManager.autoConnect(APid.c_str(), APpw.c_str());
//Load config upon start
if (!SPIFFS.begin()) {
Serial.println("Failed to mount file system");
return;
}
/* Save the config back from WIFI Manager.
This is only called after configuration
when in AP mode
*/
if (shouldSaveConfig) {
//read updated parameters
strcpy(config_name, custom_config_name.getValue());
strcpy(mqtt_server, custom_mqtt_server.getValue());
strcpy(mqtt_port, custom_mqtt_port.getValue());
strcpy(mqtt_uid, custom_mqtt_uid.getValue());
strcpy(mqtt_pwd, custom_mqtt_pwd.getValue());
strcpy(config_rotation, custom_rotation.getValue());
//Save the data
saveConfig();
}
/*
Try to load FS data configuration every time when
booting up. If loading does not work, set the default
positions
*/
loadDataSuccess = loadConfig();
if (!loadDataSuccess) {
currentPosition = 0;
maxPosition = 2000000;
}
/*
Setup multi DNS (Bonjour)
*/
if (MDNS.begin(config_name)) {
Serial.println("MDNS responder started");
MDNS.addService("http", "tcp", 80);
MDNS.addService("ws", "tcp", 81);
} else {
Serial.println("Error setting up MDNS responder!");
while(1) {
delay(1000);
}
}
Serial.print("Connect to http://"+String(config_name)+".local or http://");
Serial.println(WiFi.localIP());
//Start HTTP server
server.on("/", handleRoot);
server.onNotFound(handleNotFound);
server.begin();
//Start websocket
webSocket.begin();
webSocket.onEvent(webSocketEvent);
/* Setup connection for MQTT and for subscribed
messages IF a server address has been entered
*/
if (String(mqtt_server) != ""){
Serial.println("Registering MQTT server");
psclient.setServer(mqtt_server, String(mqtt_port).toInt());
psclient.setCallback(mqttCallback);
} else {
mqttActive = false;
Serial.println("NOTE: No MQTT server address has been registered. Only using websockets");
}
/* Set rotation direction of the blinds */
if (String(config_rotation) == "false"){
ccw = true;
} else {
ccw = false;
}
//Update webpage
INDEX_HTML.replace("{VERSION}","V"+version);
INDEX_HTML.replace("{NAME}",String(config_name));
//Setup OTA
//helper.ota_setup(config_name);
{
// Authentication to avoid unauthorized updates
//ArduinoOTA.setPassword(OTA_PWD);
ArduinoOTA.setHostname(config_name);
ArduinoOTA.onStart([]() {
Serial.println("Start");
});
ArduinoOTA.onEnd([]() {
Serial.println("\nEnd");
});
ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
});
ArduinoOTA.onError([](ota_error_t error) {
Serial.printf("Error[%u]: ", error);
if (error == OTA_AUTH_ERROR) Serial.println("Auth Failed");
else if (error == OTA_BEGIN_ERROR) Serial.println("Begin Failed");
else if (error == OTA_CONNECT_ERROR) Serial.println("Connect Failed");
else if (error == OTA_RECEIVE_ERROR) Serial.println("Receive Failed");
else if (error == OTA_END_ERROR) Serial.println("End Failed");
});
ArduinoOTA.begin();
}
}
void loop(void)
{
//OTA client code
ArduinoOTA.handle();
Blynk.run();
//Websocket listner
webSocket.loop();
/**
Serving the webpage
*/
server.handleClient();
//MQTT client
if (mqttActive){
helper.mqtt_reconnect(psclient, mqtt_uid, mqtt_pwd, { inputTopic.c_str() });
}
/**
Storing positioning data and turns off the power to the coils
*/
if (saveItNow) {
saveConfig();
saveItNow = false;
/*
If no action is required by the motor make sure to
turn off all coils to avoid overheating and less energy
consumption
*/
stopPowerToCoils();
}
/**
Manage actions. Steering of the blind
*/
if (action == "auto") {
/*
Automatically open or close blind
*/
if (currentPosition > path){
small_stepper.step(ccw ? -1: 1);
currentPosition = currentPosition - 1;
} else if (currentPosition < path){
small_stepper.step(ccw ? 1 : -1);
currentPosition = currentPosition + 1;
} else {
path = 0;
action = "";
int set = (setPos * 100)/maxPosition;
int pos = (currentPosition * 100)/maxPosition;
webSocket.broadcastTXT("{ \"set\":"+String(set)+", \"position\":"+String(pos)+" }");
sendmsg(outputTopic, "{ \"set\":"+String(set)+", \"position\":"+String(pos)+" }");
Serial.println("Stopped. Reached wanted position");
saveItNow = true;
}
} else if (action == "manual" && path != 0) {
/*
Manually running the blind
*/
small_stepper.step(ccw ? path : -path);
currentPosition = currentPosition + path;
}
/*
After running setup() the motor might still have
power on some of the coils. This is making sure that
power is off the first time loop() has been executed
to avoid heating the stepper motor draining
unnecessary current
*/
if (initLoop) {
initLoop = false;
stopPowerToCoils();
}
}
