Weight-Based Coffee Grander with Blynk App

1//#define BLYNK_PRINT Serial
2#include <ESP8266WiFi.h>
3#include <BlynkSimpleEsp8266.h>
4#include  "HX711.h"
5BlynkTimer timer;
6int relayPin = D5;  // Change to suit your board.
7
8//  HX711 circuit wiring
9const int LOADCELL_DOUT_PIN = D2; // Change to suit your  board.
10const int LOADCELL_SCK_PIN = D1; // Change to suit your board.
11
12HX711  scale;
13//Blynk project auth.
14char auth[] = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
15//  Your WiFi credentials.
16// Set password to "" for open networks.
17char ssid[]  = "YOUR-SSID";
18char pass[] = "YOURPASS";
19
20BLYNK_WRITE(V0) { scale.tare();  // Strain sensor tare
21}
22BLYNK_WRITE(V2){
23  if (param.asInt()) {
24    digitalWrite(relayPin,  HIGH);  // Relay ON.
25  } else {
26    digitalWrite(relayPin, LOW);   // Relay  OFF.
27  }
28}
29BLYNK_WRITE(V3) {
30  Blynk.virtualWrite(V2, 0);
31  digitalWrite  (relayPin, LOW);   // Grinder interupt (Emergecy stop), Relay OFF.
32}
33int slider;
34BLYNK_WRITE(V11)
35{
36slider  = param.asInt(); // Assigning incoming value from pin V11 (Slider value) to a global  variable.
37}
38
39void setup() {
40
41  Serial.begin(57600);
42  Blynk.begin(auth,  ssid, pass, "192.168.254.110", 8080);
43  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
44  scale.set_scale(1040.f);
45  timer.setInterval(500L, HX711data);  // .5 sek delay  to unstress the server and stabalize readout on numeric widget @ V1.
46  timer.setInterval(60L,  HX711relay);  // 60ms delay ono to keep fast stop grinder response and not overshoot  grinding to much.
47  digitalWrite(relayPin, LOW); // To make sure grinder doesn't  start running during boot.
48  pinMode(relayPin, OUTPUT);
49  BLYNK_CONNECTED();
50  Blynk.syncAll();
51}
52void HX711data()
53{
54  Blynk.virtualWrite(V1, scale.get_units(20));  // sending calibrated strain sensor value to Blynk value widget.
55}
56void  HX711relay()
57{
58  if (scale.get_units(20) >= (slider-0)) {
59  Blynk.virtualWrite(V2,  0);
60  digitalWrite(relayPin, LOW); //Relay OFF change the (slider-0.0) number  in seconds with one decimal to compensate if grinder overshoot "Grinder calibration".
61}
62}
63void  loop()
64{
65  Blynk.run();
66  timer.run(); 
67}
68

1//#define BLYNK_PRINT Serial
2#include <ESP8266WiFi.h>
3#include <BlynkSimpleEsp8266.h>
4#include   "HX711.h"
5BlynkTimer timer;
6int relayPin = D5;  // Change to suit your board.
7
8//   HX711 circuit wiring
9const int LOADCELL_DOUT_PIN = D2; // Change to suit your   board.
10const int LOADCELL_SCK_PIN = D1; // Change to suit your board.
11
12HX711   scale;
13//Blynk project auth.
14char auth[] = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
15//   Your WiFi credentials.
16// Set password to "" for open networks.
17char ssid[]   = "YOUR-SSID";
18char pass[] = "YOURPASS";
19
20BLYNK_WRITE(V0) { scale.tare();   // Strain sensor tare
21}
22BLYNK_WRITE(V2){
23  if (param.asInt()) {
24    digitalWrite(relayPin,   HIGH);  // Relay ON.
25  } else {
26    digitalWrite(relayPin, LOW);   // Relay   OFF.
27  }
28}
29BLYNK_WRITE(V3) {
30  Blynk.virtualWrite(V2, 0);
31  digitalWrite   (relayPin, LOW);   // Grinder interupt (Emergecy stop), Relay OFF.
32}
33int slider;
34BLYNK_WRITE(V11)
35{
36slider   = param.asInt(); // Assigning incoming value from pin V11 (Slider value) to a global   variable.
37}
38
39void setup() {
40
41  Serial.begin(57600);
42  Blynk.begin(auth,   ssid, pass, "192.168.254.110", 8080);
43  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
44   scale.set_scale(1040.f);
45  timer.setInterval(500L, HX711data);  // .5 sek delay   to unstress the server and stabalize readout on numeric widget @ V1.
46  timer.setInterval(60L,   HX711relay);  // 60ms delay ono to keep fast stop grinder response and not overshoot   grinding to much.
47  digitalWrite(relayPin, LOW); // To make sure grinder doesn't   start running during boot.
48  pinMode(relayPin, OUTPUT);
49  BLYNK_CONNECTED();
50   Blynk.syncAll();
51}
52void HX711data()
53{
54  Blynk.virtualWrite(V1, scale.get_units(20));   // sending calibrated strain sensor value to Blynk value widget.
55}
56void   HX711relay()
57{
58  if (scale.get_units(20) >= (slider-0)) {
59  Blynk.virtualWrite(V2,   0);
60  digitalWrite(relayPin, LOW); //Relay OFF change the (slider-0.0) number   in seconds with one decimal to compensate if grinder overshoot "Grinder calibration".
61}
62}
63void   loop()
64{
65  Blynk.run();
66  timer.run(); 
67}
68