Circuit Documentation

Summary of the Circuit

This circuit integrates a piezo sensor with an Arduino Nano microcontroller and a Micro SD Card Module. The piezo sensor is used to detect vibrations and generate a voltage that is read by the Arduino Nano on its analog input. The Arduino Nano processes the signal and logs the voltage data to a text file on the Micro SD card. The SD card module is interfaced with the Arduino Nano via the SPI protocol.

Component List

Piezo Sensor

• Description: A sensor that generates an electrical charge in response to mechanical stress.
• Pins:
  • +: Positive terminal
  • -: Negative terminal

Arduino Nano

• Description: A small, complete, and breadboard-friendly microcontroller board based on the ATmega328P.
• Pins:
  • Digital I/O Pins: D0-RX, D1-TX, D2-D13
  • Analog Input Pins: A0-A7
  • Other Pins: RESET, GND, VIN, 5V, 3V3, AREF

Micro SD Card Module

• Description: A module that allows micro SD cards to be read and written via SPI.
• Pins:
  • cs: Chip Select
  • sck: Serial Clock
  • mosi: Master Out Slave In
  • miso: Master In Slave Out
  • vcc: Power Supply (5V)
  • gnd: Ground

Wiring Details

Piezo Sensor

• + connected to Arduino Nano's A0
• - connected to Arduino Nano's GND

Arduino Nano

• A0 connected to Piezo Sensor's +
• GND connected to Piezo Sensor's - and Micro SD Card Module's gnd
• D10 connected to Micro SD Card Module's cs
• D11/MOSI connected to Micro SD Card Module's mosi
• D12/MISO connected to Micro SD Card Module's miso
• D13/SCK connected to Micro SD Card Module's sck
• 5V connected to Micro SD Card Module's vcc

Micro SD Card Module

• cs connected to Arduino Nano's D10
• sck connected to Arduino Nano's D13/SCK
• mosi connected to Arduino Nano's D11/MOSI
• miso connected to Arduino Nano's D12/MISO
• vcc connected to Arduino Nano's 5V
• gnd connected to Arduino Nano's GND

Documented Code

/*
 * This Arduino Sketch initializes an SD card module and logs voltage data
 * from a piezo sensor to a text file on the SD card. The piezo sensor is
 * connected to analog pin A0 of the Arduino Nano, and the SD card module
 * is connected via SPI (pins D10, D11, D12, and D13).
 */

#include <SPI.h>
#include <SD.h>

const int piezoPin = A0; // Piezo sensor connected to A0
const int chipSelect = 10; // SD card module CS pin connected to D10

void setup() {
  Serial.begin(9600);
  pinMode(piezoPin, INPUT);
  if (!SD.begin(chipSelect)) {
    Serial.println("SD card initialization failed!");
    return;
  }
  Serial.println("SD card initialized.");
}

void loop() {
  int sensorValue = analogRead(piezoPin);
  float voltage = sensorValue * (5.0 / 1023.0);
  File dataFile = SD.open("datalog.txt", FILE_WRITE);
  if (dataFile) {
    dataFile.print("Voltage: ");
    dataFile.println(voltage);
    dataFile.close();
    Serial.println("Data written to SD card.");
  } else {
    Serial.println("Error opening datalog.txt");
  }
  delay(1000); // Log data every second
}

Filename: sketch.ino

This code initializes the SD card and sets up the Arduino Nano to read the voltage from the piezo sensor. It then logs this data to a file named "datalog.txt" on the SD card. If the SD card cannot be initialized, an error message is printed to the serial monitor. The data logging occurs every second.