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notebooks/swarna/espNow_dispenser_recieve_data.ino

+/*********
+  Rui Santos
+  Complete project details at https://RandomNerdTutorials.com/esp-now-one-to-many-esp32-esp8266/
+  
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files.
+  
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+*********/
+
+#include <esp_now.h>
+#include <WiFi.h>
+#include <Stepper.h>
+#include <math.h>
+
+// Motor Driver Pins
+#define t1 8
+#define t2 9
+#define t3 10
+#define t4 11
+
+#define a1 12
+#define a2 13
+#define a3 14
+#define a4 15
+
+#define b1 8
+#define b2 9
+#define b3 10
+#define b4 11
+
+const int stepsPerRevolution = 100;
+
+//Structure example to receive data
+//Must match the sender structure
+typedef struct test_struct {
+  float ph;
+  float tds;
+  float temp;
+} test_struct;
+
+//Create a struct_message called myData
+test_struct myData;
+float tds;
+float ph = 7;
+float temp;
+int tds_flag = 0;
+
+//callback function that will be executed when data is received
+void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
+  memcpy(&myData, incomingData, sizeof(myData));
+  Serial.print("Bytes received: ");
+  Serial.println(len);
+  Serial.print("ph: ");
+  Serial.println(myData.ph);
+  Serial.print("  TDS: ");
+  Serial.println(myData.tds);
+  Serial.print("  Temp: ");
+  Serial.println(myData.temp);
+  Serial.println();
+
+  /// ASSIGN VARIABLES HERE
+  ph = myData.ph;
+  tds = myData.tds;
+  temp = myData.temp;
+
+}
+
+// initialize the stepper library
+Stepper chlor_stepper(stepsPerRevolution, t1, t2, t3, t4);
+Stepper acid_stepper(stepsPerRevolution, a1, a2, a3, a4);
+Stepper basic_stepper(stepsPerRevolution, b1, b2, b3, b4);
+ 
+void setup() {
+  //Initialize Serial Monitor
+  Serial.begin(115200);
+  
+  // Set device as a Wi-Fi Station
+  WiFi.mode(WIFI_STA);
+
+  // Init ESP-NOW
+  if (esp_now_init() != ESP_OK) {
+    Serial.println("Error initializing ESP-NOW");
+    return;
+  }
+
+  //stepper motors init
+    chlor_stepper.setSpeed(150);
+    acid_stepper.setSpeed(150);
+    basic_stepper.setSpeed(150);
+  
+  // Once ESPNow is successfully Init, we will register for recv CB to
+  // get recv packer info
+  esp_now_register_recv_cb(OnDataRecv);
+}
+ 
+int loop_num;
+void loop() {
+  // tds = 11500;
+  delay(4000);
+  ph = 7.1;
+  if (ph < 7.2) {
+    loop_num = ceil((7.6 - ph)/0.1);          // one rotation for every 0.1 ph lower than normal --> change 0.1 to actual value
+    // Serial.print(loop_num);
+    chlor_stepper.step(stepsPerRevolution*9*loop_num);
+    // Serial.print("  One round  ");
+  }
+  
+  if (ph > 7.8) {
+    loop_num = floor((7.4 - ph)/0.1);         // change 0.1 to how much increases
+    acid_stepper.step(stepsPerRevolution);
+  }
+
+  // if (tds_flag == 1) {
+  //   if (old_tds > tdsValue+25) {
+  //     tds_flag = 0;
+  //     Serial.println("Chlorine helped lower TDS value.");
+  //   } else {
+  //     Serial.println("Chlorine did not change TDS value. Please filter your water.");
+  //     tds_flag = 0;
+  //   }
+  if (tds > 1000) {
+    loop_num = (tds - 1000)/12;         // how much it actually lowers (normally 1/10000 lbs/gal for 12ppm increase)
+    chlor_stepper.step(stepsPerRevolution);
+  }
+
+  //TDS output
+  // Serial.print("  TDS Value:");
+  // Serial.print(tds,0);
+  // Serial.println("ppm");
+
+  //pH output
+  // Serial.print("  pH Value:");
+  // Serial.print(ph);
+
+  // if (temp < 26 || temp > 28) {
+  //   Serial.print("Temperature is out of range.");
+  // } else {
+  //   Serial.print("Temperature is within the proper range.");
+  // }
+
+  // ph = 7.5;
+  delay(4000); // one minute
+
+}
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