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Make an IOT LDR Alarm Circuit Using LDR Module and NodeMCU ESP8266-12E Wi-Fi Module compatible with Arduino Uno - KT571

Make an IOT LDR Alarm Circuit Using LDR Module and NodeMCU ESP8266-12E Wi-Fi Module compatible with Arduino Uno - KT571

KT571

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INTRODUCTION

In this project, we will design an IOT-based LDR alarm circuit using Node MCU ESP8266-12E Wi-Fi Board and LDR module. When the value exceeds the set value, the alarm will start ringing.

HARDWARE REQUIRED

SOFTWARE REQUIRED

Arduino IDE 1.8.10 (programmable platform for Arduino)

Click here to download the software

arduino uno

SPECIFICATIONS

NodeMCU ESP8266 CP2102 Wireless Module:

The development board equips the ESP-12E module containing the ESP8266 chip, having a Tensilica Xtensa® 32-bit LX106 RISC microprocessor which operates at 80 to 160 MHz adjustable clock frequency and supports RTOS.

  • Operating Voltage: 2.5v to 3.6v
  • On-board 3.3V 600mA regulator
  • 80mA Operating Current
  • 20 µA during Sleep Mode
  • ESP8266 CP2102 NodeMCU LUA ESP-12E WIFI Serial Wireless Module
  • Built-in Micro-USB, with flash and reset switches, easy to program
  • Full I/O port and Wireless 802.11 supported, direct download, no need to reset
  • Arduino compatible works great with the latest Arduino IDE/Mongoose IoT/Micro Python
nodemcu cp2102

WARNING:

The ESP8266 requires a 3.3v power supply and 3.3v logic levels for communication. The GPIO pins are not 5v-tolerant! You must do some level shifting if you want to interface the board with 5v (or higher) components.

LDR Module:

The Light Dependent Resistor (LDR) is just another special type of Resistor and hence has no polarity

  • Operating Voltage: 3.3V to 5V DC
  • Operating Current: 15ma
  • Output Digital - 0v to 5v, Adjustable trigger level from preset
  • Output Analogue - 0v to 5v based on light falling on the LDR

Pin Description:

  • VCC = 3.3V to 5V DC
  • GND = Ground
  • S = Output
LDR Module

CIRCUIT CONNECTION

  • Connect the “A0 (Signal)” pin of the LDR module to the “A0” pin of NodeMCU ESP8266-12e Wi-Fi Module.
  • Connect the “GND” pin of the LDR module to GND pin of NodeMCU ESP8266-12e Wi-Fi Module.
  • Connect the +5v pin of the LDR module to the 3.3v pin of NodeMCU ESP8266-12e Wi-Fi Module.
  • Connect the LED ground pin to the GND pin of the NodeMCU ESP8266-12e Wi-Fi Module.
  • Connect LED VCC to D2(GPIO4) pin of NodeMCU ESP8266-12e Wi-Fi Module.
  • Connect Buzzer Gnd to Gnd pin of NodeMCU ESP8266-12e Wi-Fi Module.
  • Connect Buzzer Positive to D1 (GPIO5) pin of NodeMCU ESP8266-12e Wi-Fi Module.
circuit connection

CODE

Click to open in Drive

WORKING AND OUTPUT

Welcome to the IoT-based project in which we are using an LDR Module using the ESP8266-12E wifi module. When Light falls upon an LDR Module and exceeds the set value in the code, then the buzzer will start beeping.

DOCUMENT

KT571 - Click to open👈