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Arduino UNO-Based Temperature and Humidity Monitoring System with Data Logging

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Circuit Documentation

Summary

This circuit is designed to measure temperature and humidity using an Adafruit DHT11 sensor and log the data to a Micro SD Card Module. The circuit includes various components such as an Arduino UNO, INA219 current sensors, a boost converter, a buck converter, capacitors, a diode, a MOSFET, and a power supply. The Arduino UNO is programmed to read data from the DHT11 sensor and log it to the SD card.

Component List

  1. Diode

    • Pins: Cathode, Anode
    • Description: A semiconductor device that allows current to flow in one direction only.
    • Purpose: Used for rectification or protection in the circuit.

  2. Ceramic Capacitor

    • Pins: Pin0, Pin1
    • Description: A capacitor with a ceramic dielectric.
    • Purpose: Used for filtering or decoupling in the circuit.
    • Properties:
      • Capacitance: 0.0000001 Farads

  3. INA219

    • Pins: VCC, GND, SCL, SDA, VIN -, VIN +
    • Description: A current sensor for high-side current measurement.
    • Purpose: Used to measure current and voltage in the circuit.

  4. Arduino UNO

    • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0
    • Description: A microcontroller board based on the ATmega328P.
    • Purpose: Used to control the circuit and log data.

  5. MOSFET

    • Pins: Gate, Drain, Source
    • Description: A type of transistor used for switching and amplification.
    • Purpose: Used for switching in the circuit.

  6. Power Supply

    • Pins: +, -
    • Description: Provides power to the circuit.
    • Purpose: Supplies the necessary voltage and current.

  7. Boost Converter (MT3608)

    • Pins: OUTPUT +, OUTPUT -, INPUT +, INPUT -
    • Description: A DC-DC converter that steps up voltage.
    • Purpose: Used to increase the voltage in the circuit.

  8. Electrolytic Capacitor

    • Pins: +, -
    • Description: A capacitor with an electrolyte as one of its plates.
    • Purpose: Used for filtering or energy storage in the circuit.
    • Properties:
      • Capacitance: 0.000001 Farads

  9. Buck Converter

    • Pins: IN+, IN-, OUT+, OUT-
    • Description: A DC-DC converter that steps down voltage.
    • Purpose: Used to decrease the voltage in the circuit.

  10. Micro SD Card Module

    • Pins: cs, sck, mosi, miso, vcc, gnd
    • Description: A module for interfacing with a micro SD card.
    • Purpose: Used to log data to a micro SD card.

Wiring Details

Diode

Ceramic Capacitor

INA219

Arduino UNO

MOSFET

Power Supply