This document provides a detailed overview of a circuit that includes an Arduino UNO as the central microcontroller, interfaced with various sensors and modules including the Adafruit BMP180 barometric pressure sensor, ESP-01 WiFi module, a photocell (LDR), a DHT03 humidity and temperature sensor, an MQ-4 methane gas sensor, and a 16x2 LCD screen with I2C interface. The circuit is powered by an MB102 Breadboard Power Supply Module capable of providing both 3.3V and 5V outputs. A resistor is also included in the circuit for the photocell voltage divider.
5V
connected to sensors and modules requiring 5VGND
connected to common groundA0
connected to DHT03 data signalA1
connected to photocell (LDR)A2
connected to MQ-4 analog outputA4
(SDA) connected to I2C data lineA5
(SCL) connected to I2C clock lineD10
connected to ESP-01 TXD11
connected to ESP-01 RXSDA
and SCL
connected to I2C bus+3V3
and GND
connected to 3.3V and ground from the power supply moduleRX
connected to Arduino D11TX
connected to Arduino D10VCC
and CH_PD
connected to 3.3VGND
connected to common ground5v
output connected to 5V sensors and Arduino 5V3.3V
output connected to 3.3V sensors and ESP-01GND
connected to common groundSDA
and SCL
connected to I2C busVCC
connected to 5VGND
connected to common groundVcc
connected to 5VData-signal
connected to Arduino A0GND 1
connected to common groundA0
connected to Arduino A2D0
not connected in this circuitVCC
connected to 5VGND
connected to common groundvoid setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
Note: The provided code is a template and does not include specific functionality. It needs to be populated with the setup and loop code to initialize and control the connected sensors and modules.