In this project, I provide detailed information about the Magicbit board, the Magicblock platform, and the methodology employed for its execution. Mainly, 3 tasks are accomplished within this project: feeding food at specified times we define, playing the owner’s voice during feeding, and sending an automatic WhatsApp notification when the food basket is empty.
This is what my DIY project looks like. I used PVC pipes to create the structure and a plastic basket (dustbin). The Magicbit is the main controlling device.
Topic list (click to jump)
- What are Magicbit and Magic blocks (click)
- Components list(click)
- Making structure (click)
- Main task methodology (click)
- Final design (click)
- Final code for magicbit (click)
What are Magicbit and Magic blocks
Magicbit is an innovative microcontroller platform designed for kids and researchers, with a focus on STEM education. The board is powered by ESP32, and it comes equipped with a variety of built-in sensors. Additionally, users have the flexibility to integrate third-party sensors. Magicbit offers firmware support, and its Magicblock platform provides straightforward methods for programming the Magicbit board.
(Note: In this project, tasks involving the server motor and ultrasonic sensor are developed using the MagicBlock platform. However, in more advanced tasks such as SPI communication and API connection, it proved to be a bit challenging. Consequently, I transitioned to the Arduino platform.)
Components list
| Components | No of components | Image |
| Magicbit | 1 |  |
| Servo Motor (MG996R) | 1 |  |
| Ultrasonic sensor (HC-SR04 4Pin ) | 1 |  |
| SD card reader | 1 |  |
| Battery pack | 1 |  |
| Speaker (Utilize your arrangement) | 1 | – |
| PVC 1.5″ | 4m |  |
| PVC L socket 1.5″ | 10 |  |
| PVC T socket 1.5″ | 6 |  |
| PVC L socket 4″ | 1 |  |
| Jumper wires | 12 (Depend on your sensors and actuators) |  |
| Nuts and Bolts | (3-8) |  |
| Super glue | – |  |
| L bracket for Servo Motor | 1 |  |
(Note: You can customize these components according to your available resources and your requirements)
Making the structure
You need to cut all the pieces of PVC before attaching, and then your basket should be properly attached.
You can create your structure, and the ultrasonic sensor (measuring the emptiness of the food basket) and servo motor (opening and closing the food incoming gate) should be placed properly.
These constitute the primary components of the structure.
Main task methodology
The primary challenge in the methodology was the requirement for a specific timeframe to execute the tasks. There are two solutions to this issue. One involves utilizing external hardware clocks (Rtc_Pcf8563, DS3231, DS1307…), while the other entails utilizing servers such as NTP servers (pool.ntp.org, asia.pool.ntp.org, europe.pool.ntp.org, north-america.pool.ntp.org).
In this project, the chosen approach involved utilizing the pool.ntp.org NTP server connecting my Magicbit board to the internet using Wi-Fi, and then establishing a connection to an NTP server.
After obtaining the exact time, the server motor should operate according to the predefined schedule. I want to feed my dog at 8:30 a.m., 12:30 p.m., and 7:30 p.m.
Server motor
The server motor is the principal component that controls the incoming food. I want to open the gate at a specific time and keep it open until a specific amount comes out, then the gate should close. When opening the gate, the motor rotates 90 degrees, and when closing, it returns to 0 degrees.
Magic block test
Here are the magic block nodes
[{"id":"4c450fff.e432c","type":"tab","label":"Flow 2","disabled":false,"info":""},{"id":"6bf38739.36de28","type":"Servo","z":"4c450fff.e432c","name":"","epId":"id4240-1702186067376","pin":"26","x":930,"y":200,"wires":[]},{"id":"11fb8f2f.0f86e1","type":"inject","z":"4c450fff.e432c","name":"","topic":"LUNCH","payload":"true","payloadType":"bool","repeat":"","crontab":"17 15 * * *","once":false,"onceDelay":0.1,"x":160,"y":120,"wires":[["2f31391e.9212f6","d6c3a4d6.7330c8"]]},{"id":"2e34e8a9.4b8688","type":"inject","z":"4c450fff.e432c","name":"","topic":"early dinner","payload":"true","payloadType":"bool","repeat":"","crontab":"00 16 * * *","once":false,"onceDelay":0.1,"x":150,"y":160,"wires":[["2f31391e.9212f6","d6c3a4d6.7330c8"]]},{"id":"8fe52360.c4d0f","type":"inject","z":"4c450fff.e432c","name":"","topic":"","payload":"true","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":170,"y":80,"wires":[["2f31391e.9212f6","d6c3a4d6.7330c8"]]},{"id":"2f31391e.9212f6","type":"DO","z":"4c450fff.e432c","name":"","epId":"id4240-1702186067376","pin":"16","x":590,"y":180,"wires":[]},{"id":"3ad2d334.d25f7c","type":"inject","z":"4c450fff.e432c","name":"","topic":"LUNCH","payload":"false","payloadType":"bool","repeat":"","crontab":"45 12 * * *","once":false,"onceDelay":0.1,"x":160,"y":280,"wires":[["2f31391e.9212f6","a69a3af6.2f5fc8"]]},{"id":"7a6f425.8282ebc","type":"inject","z":"4c450fff.e432c","name":"","topic":"early dinner","payload":"false","payloadType":"bool","repeat":"","crontab":"15 16 * * *","once":false,"onceDelay":0.1,"x":150,"y":320,"wires":[["2f31391e.9212f6","a69a3af6.2f5fc8"]]},{"id":"29f24029.e300c","type":"inject","z":"4c450fff.e432c","name":"","topic":"","payload":"false","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":170,"y":240,"wires":[["2f31391e.9212f6","a69a3af6.2f5fc8"]]},{"id":"b7540d32.4a082","type":"inject","z":"4c450fff.e432c","name":"","topic":"breakfast","payload":"true","payloadType":"bool","repeat":"","crontab":"30 08 * * *","once":false,"onceDelay":0.1,"x":160,"y":200,"wires":[["2f31391e.9212f6","d6c3a4d6.7330c8"]]},{"id":"ab30d29.1f6b83","type":"inject","z":"4c450fff.e432c","name":"","topic":"breakfast","payload":"false","payloadType":"bool","repeat":"","crontab":"45 08 * * *","once":false,"onceDelay":0.1,"x":140,"y":360,"wires":[["2f31391e.9212f6","a69a3af6.2f5fc8"]]},{"id":"d6c3a4d6.7330c8","type":"switch","z":"4c450fff.e432c","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":630,"y":280,"wires":[["8cc06ff9.a6d34"]]},{"id":"a69a3af6.2f5fc8","type":"switch","z":"4c450fff.e432c","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"0","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":630,"y":320,"wires":[["8cc06ff9.a6d34"]]},{"id":"8cc06ff9.a6d34","type":"function","z":"4c450fff.e432c","name":"","func":"// Function Node Code\n\n// Check the value of the boolean input\nif (msg.payload === true) {\n // Bool value is true (1), send number 90 as output\n msg.payload = 90;\n} else {\n // Bool value is false (0), send number 0 as output\n msg.payload = 0;\n}\n\nreturn msg;\n","outputs":1,"noerr":0,"x":800,"y":260,"wires":[["6bf38739.36de28","e6a3b99a.0d4f78"]]},{"id":"e6a3b99a.0d4f78","type":"debug","z":"4c450fff.e432c","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":930,"y":300,"wires":[]}]copy this code and past your flow
After designing your magic block, proceed to deploy your model.
Arduino test
In this code, my server motor rotates 90 degrees and returns to 0 degrees at a specific time.
#include <WiFi.h>
#include "time.h"
#include <ESP32Servo.h>
const char* ssid = "<enter your ssid>";
const char* password = "<enter password>";
const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 5 * 3600 + 30 * 60; // Adjust according to your timezone
const int daylightOffset_sec = 0;
// Servo control variables
Servo MagicServo;
void setup() {
Serial.begin(115200);
// Connect to Wi-Fi
Serial.printf("Connecting to %s ", ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println(" CONNECTED");
// Initialize and get the time
configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
// Attach the servo motor to GPIO 26 on ESP32
MagicServo.attach(26);
}
void moveServo(int degrees) {
MagicServo.write(degrees);
delay(2000); // Adjust the delay as needed
}
void loop() {
// Get current time
struct tm timeinfo;
if (!getLocalTime(&timeinfo)) {
Serial.println("Failed to obtain time");
return;
}
// Check if it's 8:30 AM
if (timeinfo.tm_hour == 8 && timeinfo.tm_min == 30) {
// Move the servo motor to the 90-degree position
moveServo(90);
Serial.println("servo works");
delay(500);
// Move the servo motor to the 0-degree position
moveServo(0);
delay(60000);
}
delay(1000); // Wait for 1 second before checking the time again
}Ultrasonic sensor
Measuring whether the food basket is empty or not is the main task of this ultrasonic sensor. It depends on the height of your basket.
Magic block test
If you are employing Magicboard’s ultrasonic sensor, it will be more straightforward for you. However, in this project, I utilized third-party sensors and attempted to process data using magic blocks.
Here are the magic block nodes. (usual way)
[{"id":"14574eb7.8f3631","type":"US","z":"42a93cc6.1a7014","name":"","epId":"id4240-1702186067376","x":520,"y":280,"wires":[["7f2704ce.40845c"]]}]
(Little bit complicated way)
[{"id":"4e047f06.2da72","type":"tab","label":"Flow 4","disabled":false,"info":""},{"id":"ab4b3a29.21f1d8","type":"inject","z":"4e047f06.2da72","name":"","topic":"","payload":"1","payloadType":"num","repeat":"1","crontab":"","once":false,"onceDelay":"10","x":150,"y":180,"wires":[["9db492d7.8ab21","1f707715.605f69"]]},{"id":"2725b385.ade28c","type":"DI","z":"4e047f06.2da72","name":"echo","epId":"id4240-1702186067376","pin":"32","method":"0","x":610,"y":240,"wires":[["7f8047e8.5d9098","d9f95702.df24f8","831b53ef.8ad51"]]},{"id":"7f8047e8.5d9098","type":"function","z":"4e047f06.2da72","name":"distance","func":"\n// Get the pulse duration from the message payload\nvar duration = msg.payload;\n\n// Calculate the distance in centimeters\n// Speed of sound is approximately 343 meters/second\n// Distance = (Duration of pulse * Speed of sound) / 2\nvar distance = (duration * 343) / 20000;\n\n// Create a new message with the calculated distance\nmsg.payload = distance.toFixed(2); // Round to 2 decimal places\nmsg.topic = \"Distance\"; // Optionally set a topic for the message\n\n// Return the modified message\nreturn msg;\n","outputs":1,"noerr":0,"x":780,"y":280,"wires":[["fd7124bd.367ea8"]]},{"id":"d9f95702.df24f8","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":770,"y":220,"wires":[]},{"id":"7a11d5b9.571acc","type":"DO","z":"4e047f06.2da72","name":"trigger","epId":"id4240-1702186067376","pin":"13","x":870,"y":160,"wires":[]},{"id":"fd7124bd.367ea8","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":870,"y":360,"wires":[]},{"id":"857d51f.66774b","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":670,"y":100,"wires":[]},{"id":"40f0ed6c.6bdbc4","type":"function","z":"4e047f06.2da72","name":"echo activating","func":"// Check if the input is the string \"3\"\nif (msg.payload === \"3\") {\n // If the input is \"3\", send a message with payload \"1\"\n var outputMsg = {\n payload: \"1\"\n };\n\n // Return the message to be sent\n return outputMsg;\n} else {\n // If the input is not \"3\", send a message with payload \"0\"\n var outputMsg = {\n payload: \"0\"\n };\n\n // Return the message to be sent\n return outputMsg;\n}\n","outputs":1,"noerr":0,"x":380,"y":220,"wires":[["88ac660b.4a4cf8","fc31f7a4.a1e928"]]},{"id":"adb5cdca.77ee2","type":"function","z":"4e047f06.2da72","name":"1to1 0,3to0","func":"// Check if the input is 1\nif (msg.payload === 1) {\n // If the input is 1, send a message with payload \"1\"\n return { payload: \"1\" };\n} else {\n // If the input is not 1, send a message with payload \"0\"\n return { payload: \"0\" };\n}\n","outputs":1,"noerr":0,"x":550,"y":160,"wires":[["857d51f.66774b","2b17d754.7bd008"]]},{"id":"fedb9227.3eac8","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":590,"y":360,"wires":[]},{"id":"8fb48b8.2182578","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":430,"y":100,"wires":[]},{"id":"9db492d7.8ab21","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":170,"y":240,"wires":[]},{"id":"1f707715.605f69","type":"function","z":"4e047f06.2da72","name":"013 function","func":"// Initialize a flag to control the loop\nvar runFunction = true;\n\n// Check if the input is 1 and the flag is true\nif (msg.payload === 1 && runFunction) {\n // Set the flag to false to prevent rechecking\n runFunction = false;\n\n // Function to be run continuously until 0 is received\n function runContinuously() {\n // Create a message with payload \"0\" for 2 milliseconds\n var msg1 = {\n payload: \"0\",\n delay: 2\n };\n\n // Create a message with payload \"1\" for 10 milliseconds\n var msg2 = {\n payload: \"1\",\n delay: 10\n };\n\n // Output \"0\"\n node.send(msg1);\n\n // Wait for 10 milliseconds and then output \"1\"\n setTimeout(function () {\n node.send(msg2);\n }, 10);\n\n // Wait for 500 milliseconds and then output \"3\"\n setTimeout(function () {\n var msg3 = {\n payload: \"3\"\n };\n node.send(msg3);\n }, 500);\n\n // Check if the flag is still true, then run the function again\n if (runFunction) {\n setTimeout(runContinuously, 512); // Adjust the delay as needed\n }\n }\n\n // Start the function\n runContinuously();\n} else if (msg.payload === 0) {\n // If the input is 0, set the flag to false to stop the function\n runFunction = false;\n}\n\n// Pass through the input message unchanged\nreturn msg;\n","outputs":1,"noerr":0,"x":330,"y":180,"wires":[["8fb48b8.2182578","adb5cdca.77ee2","40f0ed6c.6bdbc4"]]},{"id":"2b17d754.7bd008","type":"function","z":"4e047f06.2da72","name":"string to num","func":"\n// Check if the input is a string containing \"1\"\nif (msg.payload === \"1\") {\n // If the input is \"1,\" send a message with payload 1 (as a number)\n return { payload: 1 };\n} else {\n // If the input is not \"1,\" you can handle other cases or pass through the input unchanged\n return msg;\n}\n","outputs":1,"noerr":0,"x":710,"y":160,"wires":[["7a11d5b9.571acc","a6d28b25.c39028"]]},{"id":"a6d28b25.c39028","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":870,"y":100,"wires":[]},{"id":"88ac660b.4a4cf8","type":"function","z":"4e047f06.2da72","name":"string to number","func":"// Input value\nvar input = msg.payload;\n\n// Convert string to number\nvar output = Number(input);\n\n// Set the output\nmsg.payload = output;\n\nreturn msg;\n","outputs":1,"noerr":0,"x":400,"y":280,"wires":[["2725b385.ade28c","fedb9227.3eac8"]]},{"id":"fc31f7a4.a1e928","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":550,"y":200,"wires":[]},{"id":"831b53ef.8ad51","type":"function","z":"4e047f06.2da72","name":"time period","func":"var startTime;\n\n// Check if the input is a logical high (assumed to be a boolean)\nif (msg.payload === true) {\n // If the input becomes high, record the start time\n startTime = process.hrtime();\n context.set('startTime', startTime);\n} else if (msg.payload === false) {\n // If the input becomes low, calculate the duration and output it\n startTime = context.get('startTime');\n if (startTime !== undefined) {\n var endTime = process.hrtime(startTime);\n var durationMicroseconds = (endTime[0] * 1e6) + (endTime[1] / 1e3);\n\n // Set the duration as the output\n msg.payload = durationMicroseconds;\n\n // Reset the start time for the next high period\n context.set('startTime', undefined);\n }\n}\n\nreturn msg;\n","outputs":1,"noerr":0,"x":630,"y":440,"wires":[["aeba3ba3.728678"]]},{"id":"aeba3ba3.728678","type":"debug","z":"4e047f06.2da72","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","x":790,"y":440,"wires":[]}]Arduino test
In Arduino implementation, I aim to send a WhatsApp message when the sensor values exceed 50 cm using Magicbit. I have employed a third-party WhatsApp bot and API to facilitate notifications. In this project, I aim to receive notifications before the owner leaves home. I inspect the food basket every day at 6:30 A.M. and subsequently send a WhatsApp notification before departure.
#include <WiFi.h>
#include <HTTPClient.h>
#include "time.h"
const char* ssid = "<enter your ssid>"; // Add your WiFi ssid
const char* password = "<enter your password>"; // Add your WiFi password
String apiKey = "<get epi key>"; // Add your Token number that bot has sent you on WhatsApp messenger
String phone_number = "<your phone number>"; // Add your WhatsApp app registered phone number (same number that bot sent you in URL)
const int triggerPin = 21; // Ultrasonic sensor trigger pin
const int echoPin = 32; // Ultrasonic sensor echo pin
String url; // URL String will be used to store the final generated URL
void setup() {
Serial.begin(115200);
// Connect to Wi-Fi
WiFi.begin(ssid, password);
Serial.println("Connecting to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("Connected to the WiFi network");
// Initialize and get the time from NTP server
configTime(0, 0, "pool.ntp.org");
}
void loop() {
// Get current time
struct tm timeinfo;
if (!getLocalTime(&timeinfo)) {
Serial.println("Failed to obtain time");
return;
}
// Check if it's 6:30 AM
if (timeinfo.tm_hour == 6 && timeinfo.tm_min == 30) {
// Read Ultrasonic distance
float distance = getUltrasonicDistance();
Serial.printf("Ultrasonic Distance: %.2f cm\n", distance);
// Check if Ultrasonic distance is larger than 50 cm
if (distance > 50.0) {
Serial.println("Sending WhatsApp notification...");
messageToWhatsApp("Refill the food basket");
// Add a delay to prevent sending multiple notifications in a short time
delay(30000); // 30 seconds delay
}
}
// Add a delay to check the conditions periodically
delay(60000); // Check every 1 minute
}
void messageToWhatsApp(String message) {
// Adding all number, your API key, your message into one complete URL
url = "https://api.callmebot.com/whatsapp.php?phone=" + phone_number + "&apikey=" + apiKey + "&text=" + urlencode(message);
postData(); // Calling postData to run the above-generated URL once so that you will receive a message.
}
void postData() {
int httpCode; // Variable used to get the response HTTP code after calling API
HTTPClient http; // Declare object of class HTTPClient
http.begin(url); // Begin the HTTPClient object with the generated URL
httpCode = http.POST(url); // Finally, Post the URL with this function, and it will store the HTTP code
if (httpCode == 200) { // Check if the response HTTP code is 200
Serial.println("Sent WhatsApp notification.");
} else { // If the response HTTP code is not 200, there is some error
Serial.println("Error sending WhatsApp notification.");
}
http.end(); // After calling API end the HTTP client object.
}
String urlencode(String str) {
String encodedString = "";
char c;
char code0;
char code1;
char code2;
for (int i = 0; i < str.length(); i++) {
c = str.charAt(i);
if (c == ' ') {
encodedString += '+';
} else if (isalnum(c)) {
encodedString += c;
} else {
code1 = (c & 0xf) + '0';
if ((c & 0xf) > 9) {
code1 = (c & 0xf) - 10 + 'A';
}
c = (c >> 4) & 0xf;
code0 = c + '0';
if (c > 9) {
code0 = c - 10 + 'A';
}
code2 = '\0';
encodedString += '%';
encodedString += code0;
encodedString += code1;
}
yield();
}
return encodedString;
}
float getUltrasonicDistance() {
digitalWrite(triggerPin, LOW);
delayMicroseconds(2);
digitalWrite(triggerPin, HIGH);
delayMicroseconds(10);
digitalWrite(triggerPin, LOW);
float duration = pulseIn(echoPin, HIGH);
return (duration * 0.0343) / 2; // Calculate distance in cm
}
Note: You need to obtain the API to create that WhatsApp bot. Follow this tutorial for guidance on creating your WhatsApp bot.
Here, you must consistently connect your Magicbit board to the internet.
SD card reader
Here, you cannot upload your voice record to your Magicbit board. The Magicbit’s processors have 520 KiB, and typically, all microcontrollers utilize external storage devices to save files, such as sound files.
Here, I employ an external sound system, while you can opt for a single speaker with an amplification circuit, such as the PAM8403. Alternatively, you can utilize the MP3 DFplayer module independently.
I employed a separate Arduino Uno board for sound playback.
(Note: Disconnect RX & TX before uploading the code.)
On the Magicbit code side, you only need to send the “up” test to the serial. This implies that when you want to play your voice recording, you have to input this command.
Serial.println("up");This is Arduino side code
#include "SD.h"
#define SD_ChipSelectPin 4
#include "TMRpcm.h"
#include "SPI.h"
TMRpcm tmrpcm;
void setup() {
tmrpcm.speakerPin = 9;
Serial.begin(115200);
if (!SD.begin(SD_ChipSelectPin)) {
Serial.println("SD fail");
return;
}
tmrpcm.setVolume(5);
//tmrpcm.play("Teddy_me.wav");
}
void loop() {
if (Serial.available() > 0) {
String input = Serial.readStringUntil('\n');
input.trim();
if (input == "up") {
Serial.println("Playing sound...");
tmrpcm.play("Teddy_me.wav");
delay(500); // Adjust delay as needed
}
}
}Before uploading your voice to the SD card, you need to format your SD card. Additionally, ensure that your sound file is converted to 8-bit and that the format is changed to WAV type. use this site.
Final design
Before reaching this stage, you need to inspect all the components, and connections with Magicbit boards considering their durability. Additionally, consider food safety.
final code for magicbit.
#include <WiFi.h>
#include <HTTPClient.h>
#include "time.h"
#include <ESP32Servo.h>
const char* ssid = "<enter your ssid>";
const char* password = "<enter your password>";
const char* ntpServer = "pool.ntp.org";
const long gmtOffset_sec = 5 * 3600 + 30 * 60; // Adjust according to your timezone
const int daylightOffset_sec = 0;
// Servo control variables
Servo MagicServo;
// Flag to track if "up" has been sent
bool upSent = false;
const int triggerPin = 21; // Ultrasonic sensor trigger pin
const int echoPin = 32; // Ultrasonic sensor echo pin
String apiKey = "<get epi key>"; // Add your Token number that bot has sent you on WhatsApp messenger
String phone_number = "<your phone number>"; // Add your WhatsApp app registered phone number (same number that bot sent you in URL)
String url; // URL String will be used to store the final generated URL
float getUltrasonicDistance();
void messageToWhatsApp(String message);
void setup() {
Serial.begin(115200);
// Connect to Wi-Fi
WiFi.begin(ssid, password);
Serial.println("Connecting to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("Connected to the WiFi network");
// Initialize and get the time from NTP server
configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
// Attach the servo motor to GPIO 26 on ESP32
MagicServo.attach(26);
}
void moveServo(int degrees) {
MagicServo.write(degrees);
delay(500); // Adjust the delay as needed
}
void loop() {
// Get current time
struct tm timeinfo;
if (!getLocalTime(&timeinfo)) {
Serial.println("Failed to obtain time");
return;
}
// Check if it's 6:30 AM
if (timeinfo.tm_hour == 6 && timeinfo.tm_min == 30) {
// Read Ultrasonic distance
float distance1 = getUltrasonicDistance();
delay(1000); // Delay between samples
float distance2 = getUltrasonicDistance();
delay(1000); // Delay between samples
float distance3 = getUltrasonicDistance();
// Calculate the median value
float medianDistance = calculateMedian(distance1, distance2, distance3);
Serial.printf("Ultrasonic Median Distance: %.2f cm\n", medianDistance);
// Check if Ultrasonic distance is larger than 50 cm
if (medianDistance > 50.0) {
Serial.println("Sending WhatsApp notification...");
messageToWhatsApp("Refill the food basket");
// Add a delay to prevent sending multiple notifications in a short time
delay(30000); // 30 seconds delay
}
}
// Check if it's 8:30 AM, 12:30 PM, or 7:30 PM
if ((timeinfo.tm_hour == 8 && timeinfo.tm_min == 30) ||
(timeinfo.tm_hour == 12 && timeinfo.tm_min == 30) ||
(timeinfo.tm_hour == 19 && timeinfo.tm_min == 30)) {
// Move the servo motor to the 90-degree position
moveServo(90);
Serial.println("servo works");
Serial.println("up");
delay(500); // Wait for 500 ms
// Move the servo motor to the 0-degree position
moveServo(0);
}
// Add a delay to check the conditions periodically
delay(60000); // Check every 1 minute
}
// ... (rest of the existing functions)
float calculateMedian(float a, float b, float c) {
if ((a >= b && a <= c) || (a <= b && a >= c))
return a;
else if ((b >= a && b <= c) || (b <= a && b >= c))
return b;
else
return c;
}
use the same Arduino code to play sounds
This marks the completion of the final project, allowing you to feed your dog even when you are away from home. For further development, you can monitor your dog using a camera module and implement the ESP32 CAM module with the Magicbit board. MicroPython serves as an alternative platform, and you can refer to the following links on the official Magicbit site for guidance.
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