Circuit Documentation

Summary

This circuit involves an ESP8266 NodeMCU microcontroller, a DHT11 temperature and humidity sensor, an OLED display, a DC-DC converter, and a 9V battery. The ESP8266 NodeMCU serves as the main controller, interfacing with the DHT11 sensor to read environmental data and displaying it on the OLED screen. The DC-DC converter steps down the voltage from the 9V battery to power the ESP8266 NodeMCU.

Component List

ESP8266 NodeMCU

• Description: A low-cost Wi-Fi microcontroller with GPIO, PWM, ADC, I2C, and 1-Wire capabilities.
• Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

DHT11

• Description: A basic, low-cost digital temperature and humidity sensor.
• Pins: DATA, GND, VCC

OLED Display 128x32

• Description: A small, monochrome OLED display with I2C interface.
• Pins: SDA, SCL, VCC, GND

DC-DC Converter

• Description: A device that steps down the voltage from a higher voltage source to a lower voltage.
• Pins: +VCC IN, GND IN, +VCC OUT, GND OUT

9V Battery

• Description: A standard 9V battery used as a power source.
• Pins: -, +

Wiring Details

ESP8266 NodeMCU

• D1 connected to SCL of OLED Display
• D2 connected to SDA of OLED Display
• 3V3 connected to VCC of OLED Display
• GND connected to GND of OLED Display
• D7 connected to DATA of DHT11
• GND connected to GND of DHT11
• 3V3 connected to VCC of DHT11
• GND connected to GND OUT of DC-DC Converter
• VIN connected to +VCC OUT of DC-DC Converter

DHT11

• DATA connected to D7 of ESP8266 NodeMCU
• GND connected to GND of ESP8266 NodeMCU
• VCC connected to 3V3 of ESP8266 NodeMCU

OLED Display 128x32

• SCL connected to D1 of ESP8266 NodeMCU
• SDA connected to D2 of ESP8266 NodeMCU
• VCC connected to 3V3 of ESP8266 NodeMCU
• GND connected to GND of ESP8266 NodeMCU

DC-DC Converter

• +VCC IN connected to + of 9V Battery
• GND IN connected to - of 9V Battery
• +VCC OUT connected to VIN of ESP8266 NodeMCU
• GND OUT connected to GND of ESP8266 NodeMCU

9V Battery

• + connected to +VCC IN of DC-DC Converter
• - connected to GND IN of DC-DC Converter

Documented Code

sketch.ino

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

documentation.txt