1 Embedded System Using ESP32 Instructor : Mr Mahdzir Bin Jamiaan Fasilitator : Madam Munirah Mujid Training Kit and Material Hardware : ● Iot Learning Kit/Developement Board ● Sensor : ware : ● Arduino IDE ● MQTTbox Windows App ● Nodejs ● Node-Red ● Bluestack - for non android users Mobile App : Android Platform ● IoT MQTT Panel - https://play.google.com/store/apps/details?id=snr.lab.iotmqttpanel.prod&hl=en&gl=US ● MQTT dashboard - https://play.google.com/store/apps/details?id=com.lapetov.mqtt&hl=en&gl=US ● MQTT Dash - https://play.google.com/store/apps/details?id=net.routix.mqttdash&hl=en&gl=US ● Iphone IoS Platform ● IoT onoff - https://www.iot-onoff.com/ https://www.bluestacks.com/ms/index.html
2 TENTATIVE PROGRAM ONLINE SESSION - IoT Software and Data Monitoring Concept Time Topic Notes 8.30 - 9.15 Session 1 - Introduction to IoT 9.15 - 10.15 Session 2 - Introduction IoT Protokol and Data communication Using MQTT Download Arduino IDE 10.30 - 12.30 Session 3 - Online Hands On Application using MQTT Client Server Tools 2.30 - 4.00 Session 4 - Data display and control from Android Mobile Dashboard Application F2F SESSION - Interfacing Hardware devices and Data Monitoring Time Topic Notes Session 1 - Introduction IoT Hardware and Devices Session 2 - Introduction to ESP32 microcontroller ➔ IoT Evakits ESP-32 Learning Board ➔ Installing Arduino IDE for ESP32 Board Download Arduino IDE Session 3 - Exloring ESP32 GPIO Pins ➔ Digital Input and Output ◆ Output to LED, Buzzer ◆ Input fron SWITCH , Touch Sensor ◆ ESP32 PWM Session 4 - Exloring ESP32 GPIO Pins ➔ Analog Input ◆ Read from Analog Potentiometer as a a sensor ◆ Read from LDR sensor Serial Monitor Session 5 - Introduction to MQTT ➔ IOT Protocols, IOT Platforms ➔ Why MQTT ➔ MQTT - Pub/Sub, Topic and Broker ➔ Apply Mqtt in Mobile/PC Application ● Download MQTT IoT panel - Android ● Download MQTTbox - pc Session 6 - Review previous session Session 7 - Publish data and Monitoring ➔ Read 1st Sensor - analog VR and publish a topic to mosquito server ➔ Read 2nd Sensor - analog LDR and publish a topic to mosquito server Read data convert to string before publish to server
3 Session 8 - Subscribe data for Control Actuators ➔ Send a data from MQTT App to ON and OFF a LED. ➔ Send a data from MQTT App to ON and OFF another LEDs and Buzzer. Simple Application Project using MQTT and Android App. Closing Session.
4 Table of Contents Participant List 1 T r ainin g Kit a n d M a t e rial 2 H a r d w a r e : 2 S o ft w a r e : 2 M o bile A n d r oid A p p 2 T E N TAT I V E R O G R A M 2 Ta b l e o f C o n t e n t s 4 S e s s i o n 1 : 5 I n t r o d u c t i o n t o R o b o t i c 5 S e s s i o n 2 : 6 I n t r o d u c t i o n t o E S P 3 2 m i c r o c o n t r o l l e r 6
5 Session 1: Session 1 - Introduction IoT Hardware and Devices Sistem IoT Pembangunan Sistem IoT ini terbahagi kepada 3 bahagian utama iaitu ● End Node ● Gateway Server ● User Client Seksyen 1 : Pengenalan Kepada Endnode - Embedded System Hardware - Mikropengawal
6 Jadual Ringkasan Pin (30 PIN ESP 32 DoiT) Pin I O Nota PIN I O Nota EN 23 ok ok MOSI (VSPI) 36 ok x ADC1_CH0, RTC_GPIO0 Input Only 22 ok ok SCL 39 ok x ADC1_CH3, RTC_GPIO3 Input Only 1 Tx ok debug output at boot 34 ok x ADC1_CH4, RTC_GPIO4 Input Only 3 ok Rx HIGH at boot 35 ok x ADC1_CH7, RTC_GPIO5 Input Only 21 ok ok SDA 32 ok ok ADC1_CH4, RTC_GPIO9 19 ok ok MISO (VSPI) 33 ok ok ADC1_CH5, RTC_GPIO8 18 ok ok CLK(VSPI) 25 ok ok ADC2_CH8, RTC_GPIO6 5 ok ok PWM CS (VSPI) 26 ok ok ADC2_CH9, RTC_GPIO7 17 ok ok Tx 27 ok ok ADC2_CH7, RTC_GPIO17 16 ok ok Rx
7 14 ok ok ADC2_CH0,PWM, RTC_GPIO16 CLK(HSPI) 4 ok ok ADC2_CH0, RTC_GPIO10 12 ok ok ADC2_CH5, boot fail if pulled high, RTC_GPIO15 MISO (HSPI) 2 ok ok ADC2_CH2, connected to on-board LED, RTC_GPIO12 13 ok ADC2_CH4, RTC_GPIO14 MOSI (HSPI) 15 ok ok PWM, RTC_GPIO13 CS (HSPI) GND x x power GND x x power VIN x x power 3v3 x x power Jadual Ringkasan Pin (baki pin selain dari jadual di atas) Pin I O Nota PIN I O Nota 0 pull up ok ADC2_CH1, RTC_GPIO11 outputs PWM signal at boot 20 6 x x connected to the integrated SPI flash 9 x x connected to the integrated SPI flash 7 x x connected to the integrated SPI flash 10 x x connected to the integrated SPI flash 8 x x connected to the integrated SPI flash 11 x x connected to the integrated SPI flash 28 29 30 31 37 ADC1_CH1 38 ADC1_CH2 24 Note: ● ADC2 pins cannot be used when Wi-Fi is used. ● All pins that can act as outputs can be used as PWM pins (GPIOs 34 to 39 can’t generate PWM). ● All GPIOs can be configured as interrupts. https://randomnerdtutorials.com/esp32-pinout-reference-gpios/
8 Installing the ESP32 Board in Arduino IDE in windows OS https://www.arduino.cc/en/Main/OldSoftwareReleases#previous Installing ESP 32 Board manager https://randomnerdtutorials.com/installing-the-esp32-board-in-arduino-ide-windows-instructio ns/ https://dl.espressif.com/dl/package_esp32_index.json, http://arduino.esp8266.com/stable/package_esp8266com_index. json
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10 After installation
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12 Check port yang digunakan untuk sambung dengan ESP32 Testing board
13 Arduino Cheat Sheet http://www.cheat-sheets.org/saved-copy/Arduino-cheat-sheet-v02c.pdf Task 1: LED void setup() { pinMode(23,OUTPUT); // configure GPIO 5 as OUTPUT // Run once in coding } void loop() { digitalWrite(23,HIGH); // 3.3V output to GPIO 5 delay(1000); // delay 1s digitalWrite(23,LOW); delay(1000); }
14 Task 2: Add another LED to run running light Task 3: Analog Input int varRes=33; void setup() { Serial.begin(9600); } void loop() { int bacaanVR = analogRead(varRes); Serial.println(bacaanVR); float voltan = bacaanVR * 0.0008; Serial.print(voltan); Serial.println( " volts"); delay(500); } I2C LCD https://playground.arduino.cc/Main/I2cScanner/ Find I2C Scanner
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16 Install library of I2C < tools> < Manage libraries> Run Simple coding to test Your LCD Hands On Intall library for DS18B20
17 Combine Serial monitor and i2c LCD Task 5:
18 Task 6 ESP 32 and MQTT
19 ESP INPUT and Output Digital output with onboard LED Digital output with onboard Buzzer Digital input with onboard Switch --- https://www.ipson.nl/how-to-connect/ If you are using a normally open (N.O.) push-button switch, when the switch is pressed, it will send a low level (0V) to the terminal (thus the term “active low”). Working with LCD Analog input with onboard potentiometer Analog input with onboard LDR Read temperature using DS18B20
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22 DAY 2 - IoT Project - Tajuk : Automatic Monitoring and control IoT System for chemical storage room. Jadual Sambungan Input/Output dan Perantaramuka Micro Pengawal ESS32 Input/Outp ut ESP32 Pin # PinMode Nama Pin Nama Pembolehubah Nota 1 LED1 GPIO 25 OUTPUT relay01 - Mengawal lampu 2 LED2 GPIO 26 OUTPUT relay02 - Menawal Kipas 3 DHT11 GPIO 34 INPUT pinDHT dataDHT Membaca suhu 6 buzzer GPIO 02 OUTPUT buzz - Alarm 3 DS18B20 GPIO 4 onewire senSuhu dataSuhu Membaca suhu air kolam 9 LCD GPIO22 GPIO21 Module I2C I2c LCD - Paparan skrin Sda = GPIO22 Scl = GPIO21
23 Task 1: Test LCD (i2c) Setup wi-FI Setup wi-fi
2 4 I n c l u d e W i - f i f u n c t i o n v oid s e t u p _wifi( ) { d ela y ( 1 0 ); Serial.prin tln ( ); Serial.print("Co n n e c tin g t o " ); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CO N N E C T E D ) { d ela y ( 5 0 0 ); Serial.print( "." ); }Serial.println(""); Serial.println("WiFi c o n n e c t e d " ); Serial.println("IP address: "); Serial.println(WiFi.localIP()); delay(3000); }
25 Read LDR Insert/setting PubSub library
26 #include <PubSubClient.h> //-------MQTT------------------------------------- const char* mqtt_server = "broker.hivemq.com"; WiFiClient espClient; //mqtt PubSubClient client(espClient); //MQTT client.setServer(mqtt_server, 1883); //mqtt client.setCallback(callback); //mqtt Call back and reconnect void callback(char* topic, byte* message, unsigned int length) { Serial.print("Message arrived on topic: "); Serial.print(topic); Serial.print(". Message: "); String messageTemp; for (int i = 0; i < length; i++) { Serial.print((char)message[i]); messageTemp += (char)message[i]; } Serial.println(); // add more if statements to control more GPIOs with MQTT // If a message is received on the topic esp32/output, you check if the message is either "on" or "off". if (String(topic) == "home/suis1") {
27 Serial.print("Changing output to "); if(messageTemp == "on"){ Serial.println("on"); // digitalWrite(Relay01,HIGH); client.publish("home/relay1/status", "RELAY 1 ON"); } else if(messageTemp == "off"){ Serial.println("off"); // digitalWrite(Relay01,LOW); client.publish("home/relay1/status", "RELAY 1 OFF"); } } if (String(topic) == "home/suis2") { Serial.print("Changing output to "); if(messageTemp == "on"){ Serial.println("on"); // digitalWrite(Relay02,HIGH); client.publish("home/relay2/status", "RELAY 2 ON"); } else if(messageTemp == "off"){ Serial.println("off"); // digitalWrite(Relay02,LOW); client.publish("home/relay2/status", "RELAY 2 OFF"); } } void reconnect() { //----client subscribe---------------------------------------------------------- // Loop until we're reconnected while (!client.connected()) { Serial.print("Attempting MQTT connection..."); // Attempt to connect if (client.connect("azapkm01")) { //client mesti unik dan berbeza---------- Serial.println("connected"); // Subscribe client.subscribe("home/suis1"); client.subscribe("home/suis2"); } else { Serial.print("failed, rc="); Serial.print(client.state()); Serial.println(" try again in 5 seconds"); // Wait 5 seconds before retrying delay(5000); } } }
28 Complete Coding #include <Wire.h> #include <LiquidCrystal_I2C.h> #include <WiFi.h> #include <PubSubClient.h> //-------MQTT------------------------------------- const char* mqtt_server = "broker.hivemq.com"; WiFiClient espClient; //mqtt PubSubClient client(espClient); //MQTT //-------WiFI------------------------------------- const char* ssid = "PMK- MYLINE"; // put wi-fi id const char* password = "polimelaka"; // wi-fi password //-------LCD------------------------------------- LiquidCrystal_I2C lcd(0x27,20,4); void setup_wifi() { delay(10); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); Serial.println("IP address: "); Serial.println(WiFi.localIP()); delay(3000); } void callback(char* topic, byte* message, unsigned int length) { Serial.print("Message arrived on topic: "); Serial.print(topic); Serial.print(". Message: "); String messageTemp; for (int i = 0; i < length; i++) { Serial.print((char)message[i]);
29 messageTemp += (char)message[i]; } Serial.println(); // add more if statements to control more GPIOs with MQTT // If a message is received on the topic esp32/output, you check if the message is either "on" or "off". if (String(topic) == "home/suis1") { Serial.print("Changing output to "); if(messageTemp == "on"){ Serial.println("on"); // digitalWrite(Relay01,HIGH); client.publish("home/relay1/status", "RELAY 1 ON"); } else if(messageTemp == "off"){ Serial.println("off"); // digitalWrite(Relay01,LOW); client.publish("home/relay1/status", "RELAY 1 OFF"); } } if (String(topic) == "home/suis2") { Serial.print("Changing output to "); if(messageTemp == "on"){ Serial.println("on"); // digitalWrite(Relay02,HIGH); client.publish("home/relay2/status", "RELAY 2 ON"); } else if(messageTemp == "off"){ Serial.println("off"); // digitalWrite(Relay02,LOW); client.publish("home/relay2/status", "RELAY 2 OFF"); } } } //----client subscribe---------------------------------------------------------- void reconnect() { // Loop until we're reconnected while (!client.connected()) { Serial.print("Attempting MQTT connection..."); // Attempt to connect if (client.connect("azapkm01")) { //client mesti unik dan berbeza---------- Serial.println("connected"); // Subscribe client.subscribe("home/suis1"); client.subscribe("home/suis2"); } else { Serial.print("failed, rc="); Serial.print(client.state()); Serial.println(" try again in 5 seconds");
3 0 // W ait 5 s e c o n d s b e fo r e r e t r yin g d ela y ( 5 0 0 0 ); } } } v oid s e t u p ( ) { S e rial.b e gin ( 1 1 5 2 0 0 ); lcd.init(); lcd.backlight(); lcd.setCursor(0,0); lcd.print("IOT PMK 20 2 1 " ); delay(1000); lcd.clear(); setup_wifi(); client.setServer(mqtt_serve r, 1 8 8 3 ); // m q t t clie n t.s e t C allb a c k ( c allb a c k ); // m q t t } in t s e n s o r L D R = 3 4; char varPotString[8 ]; long lastMsg = 0; char msg[50]; int value = 0; void loop() { if (!client.connected ( ) ) { r e c o n n e c t ( ); }client.loop(); long now = millis ( ); if (now - lastMsg > 2 0 0 0 ) { lastMsg = now; //--------------sensor LDR int nilaildr=analogRead(ld r ); Serial.println(nilaildr); delay(500); varPotString[8]; dtostrf(nilaildr, 1, 1, varPotS t rin g ); client.publish("", varPotString); //------end----------------------------
31 } } Sensor Monitoring Step 1 : LCD Step 2 : LDR Actutor control Day 3 : Node Red Installing Node Red 1st step a) Install node.js https://nodejs.org/en/download/
32 b) INstalling node-red on windows https://nodered.org/docs/getting-started/windows
33 Run on ip address Run on local host Installing node red dashboard
34 MQTT setup Run dashboard
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