Circuit Documentation

Summary

This circuit is designed to control multiple AC bulbs using an ESP32 microcontroller and an 8-channel relay module. The system also includes a Nextion Touch LCD for user interaction. The ESP32 is powered by a 3.3V battery, and the AC bulbs are powered by an AC source.

Component List

1. ESP32 (30 pin)

   • Description: A powerful microcontroller with built-in Wi-Fi and Bluetooth capabilities.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

2. 8 Channel Relay JD-VCC

   • Description: A relay module that allows control of high voltage devices.
   • Pins: JD-VCC, VCC, GND, In8, In7, In6, In5, In4, In3, In2, In1, In1_NC, IN1_COM, IN1_NO, IN2_NC, IN2_COM, IN2_NO, IN3_NC, IN3_COM, IN3_NO, IN4_NC, IN4_COM, IN4_NO, IN5_NC, IN5_COM, IN5_NO, IN6_NC, IN6_COM, IN6_NO, IN7_NC, IN7_COM, IN7_NO, IN8_NC, IN8_COM, IN8_NO

3. 3.3V Battery

   • Description: A battery providing 3.3V power supply.
   • Pins: +, -

4. AC Bulb

   • Description: Standard AC bulbs used for lighting.
   • Pins: P, N

5. Nextion Touch LCD 2.4"

   • Description: A touch-sensitive LCD display for user interaction.
   • Pins: VCC, GND, RX, TX

6. AC Source

   • Description: Provides AC power to the bulbs.
   • Pins: +, -

Wiring Details

ESP32 (30 pin)

• D32: Connected to In7 of the 8 Channel Relay JD-VCC
• D33: Connected to In8 of the 8 Channel Relay JD-VCC
• D25: Connected to In4 of the 8 Channel Relay JD-VCC
• D26: Connected to In5 of the 8 Channel Relay JD-VCC
• D27: Connected to In6 of the 8 Channel Relay JD-VCC
• D14: Connected to In3 of the 8 Channel Relay JD-VCC
• D12: Connected to In1 of the 8 Channel Relay JD-VCC
• D13: Connected to In2 of the 8 Channel Relay JD-VCC
• GND: Connected to GND of the Nextion Touch LCD 2.4" and GND of the 8 Channel Relay JD-VCC
• Vin: Connected to VCC of the Nextion Touch LCD 2.4" and VCC of the 8 Channel Relay JD-VCC
• TX2: Connected to TX of the Nextion Touch LCD 2.4"
• RX2: Connected to RX of the Nextion Touch LCD 2.4"
• GND: Connected to - of the 3.3V Battery
• 3V3: Connected to + of the 3.3V Battery

8 Channel Relay JD-VCC

• In7: Connected to D32 of the ESP32
• In8: Connected to D33 of the ESP32
• In4: Connected to D25 of the ESP32
• In5: Connected to D26 of the ESP32
• In6: Connected to D27 of the ESP32
• In3: Connected to D14 of the ESP32
• In1: Connected to D12 of the ESP32
• In2: Connected to D13 of the ESP32
• GND: Connected to GND of the ESP32
• VCC: Connected to Vin of the ESP32
• IN1_COM, IN2_COM, IN3_COM, IN4_COM, IN5_COM, IN6_COM, IN7_COM, IN8_COM: Connected to + of the AC Source
• IN1_NO: Connected to P of the AC Bulb
• IN2_NO: Connected to P of the AC Bulb
• IN3_NO: Connected to P of the AC Bulb
• IN4_NO: Connected to P of the AC Bulb
• IN5_NO: Connected to P of the AC Bulb
• IN6_NO: Connected to P of the AC Bulb
• IN7_NO: Connected to P of the AC Bulb
• IN8_NO: Connected to P of the AC Bulb

3.3V Battery

• -: Connected to GND of the ESP32
• +: Connected to 3V3 of the ESP32

AC Bulb

• P: Connected to IN1_NO of the 8 Channel Relay JD-VCC
• P: Connected to IN2_NO of the 8 Channel Relay JD-VCC
• P: Connected to IN3_NO of the 8 Channel Relay JD-VCC
• P: Connected to IN4_NO of the 8 Channel Relay JD-VCC
• P: Connected to IN5_NO of the 8 Channel Relay JD-VCC
• P: Connected to IN6_NO of the 8 Channel Relay JD-VCC
• P: Connected to IN7_NO of the 8 Channel Relay JD-VCC
• P: Connected to IN8_NO of the 8 Channel Relay JD-VCC
• N: Connected to N of the AC Source

Nextion Touch LCD 2.4"

• GND: Connected to GND of the ESP32
• VCC: Connected to Vin of the ESP32
• RX: Connected to RX2 of the ESP32
• TX: Connected to TX2 of the ESP32

AC Source

• +: Connected to IN1_COM, IN2_COM, IN3_COM, IN4_COM, IN5_COM, IN6_COM, IN7_COM, IN8_COM of the 8 Channel Relay JD-VCC
• -: Connected to N of all AC Bulbs

Code Documentation

#include <INextionBooleanValued.h>
#include <INextionCallback.h>
#include <INextionColourable.h>
#include <INextionFontStyleable.h>
#include <INextionNumericalValued.h>
#include <INextionStringValued.h>
#include <INextionTouchable.h>
#include <INextionWidget.h>
#include <Nextion.h>
#include <NextionButton.h>
#include <NextionCallbackFunctionHandler.h>
#include <NextionCheckbox.h>
#include <NextionCrop.h>
#include <NextionDualStateButton.h>
#include <NextionGauge.h>
#include <NextionHotspot.h>
#include <NextionNumber.h>
#include <NextionPage.h>
#include <NextionPicture.h>
#include <NextionProgressBar.h>
#include <NextionRadioButton.h>
#include <NextionSlider.h>
#include <NextionSlidingText.h>
#include <NextionText.h>
#include <NextionTimer.h>
#include <NextionTypes.h>
#include <NextionVariableNumeric.h>
#include <NextionVariableString.h>
#include <NextionWaveform.h>
#include <esp32_azureiotkit_sensors.h>

// Relay Pins
#define RELAY1 12
#define RELAY2 13
#define RELAY3 14
#define RELAY4 25
#define RELAY5 26
#define RELAY6 27
#define RELAY7 32
#define RELAY8 33

// Relay State
bool relayState[8] = {false, false, false, false, false, false, false, false};

// Nextion Display Setup
#define RX_PIN 16
#define TX_PIN 17
Nextion myNextion(RX_PIN, TX_PIN);

// Function to Update Relays
void updateRelay(int relay, bool state) {
  digitalWrite(relay, state ? LOW : HIGH);  // Active LOW
}

// Function to Sync with Nextion Display
void updateNextion(int button