Description:

In this project we build a Pedometer using Arduino which detects and counts steps you take while walking or jogging. Steps are detected using ADXL345 Accelerometer sensor when there is tilt in the axis of the sensor. Steps can be seen on 0.96 inch OLED Display Module and everything is controlled using Arduino UNO.

Circuit Diagram:

Components:

SR. NO.	COMPONENT	PINOUT DIAGRAM	BUY
1	Arduino UNO (Other Arduinos can be used too)	Arduino UNO Pinout Diagram⇗
2	0.96 inch OLED Display Module
3	ADXL345 Accelerometer Module

Steps and Info:

1. Get correct components as given. You can buy online or offline. I buy electronics components mostly from Amazon.

2. Start connecting the components. If you are new to connecting components in an electronic circuit, then use a Breadboard or you can straight up make connections using Jumper wires but it will create problem when there will be two or more connections needed at one pin (for example two or more different sensors 5V connection to Arduino’s 5V pin). But before soldering components on a PCB or printing a PCB for your circuit, better try using breadboard so that any errors and mistakes can be observed on breadboard and not after soldering. Or do connections in your way.

3. Now after building the circuit, download the Arduino IDE from https://www.arduino.cc/ website.

4. If you are new to Arduino IDE software, then watch this video we made specially for beginners about Arduino IDE.

5. If you know Arduino IDE then straight up copy the code we given and paste it into the Arduino IDE sketch.

6. Connect the Arduino to your Computer/device. Select a proper port, proper Arduino type and whatever other settings are. Here it is Arduino UNO. (If you don’t know what this all is then watch our video: ).

7. Compile the code and Upload it.

8. If any error occurs then try to troubleshoot it by finding/copy-pasting it into our Solve Errors page https://electronicsprojects.in/solve-errors/, or you can straight up paste the error on Internet and you know the rest. Also check if there are no spelling/syntax errors in the code. Compile the code again once to check if errors are fixed. I have given proper connections and code but still nothing is perfect.

9. Once code compiles and uploads smoothly, you can start testing the working of your circuit/project.

10. Take the circuit and starting tilting it, if there is output(steps) seen on the 0.96 inch OLED Display then put the circuit in pocket or stick it to your Arm or just keep in hand and start walking/jogging.

11. Keep the ADXL345 Accelerometer in proper position so that it will only tilt when you walk and that tilt will be registered as a step.

12. If it doesn’t work then check connections and code. Also you can talk with me and the community through discord. All the links to social is given at the right side of this page.

Program Code:

/* https://www.electronicsprojects.in Pedometer(Steps Counter) using Arduino, ADXL345 Accelerometer Sensor and 0.96” OLED Display */

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_MOSI   9
#define OLED_CLK   8
#define OLED_DC    11
#define OLED_CS    12
#define OLED_RESET 10
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
  OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);


float xavg=0, yavg=0, zavg=0;
float xcur=0, ycur=0, zcur=0;
float xnxt=0, ynxt=0, znxt=0;
int steps = 0;

void setup() {
ssd1306_init();
adxl345_init();
read_av_acc();
}

void loop() {
for(int i = 0; i<50; i++){
Wire.beginTransmission(0x53);
Wire.write(0x32); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte x0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x33); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte x1 = Wire.read();
x1 = x1 & 0x03;

uint16_t x = (x1 << 8) + x0;
int16_t xf = x;
if(xf > 511)
{
xf = xf - 1024;
}
float xa = xf * 0.004;
xcur = xcur + xa;


Wire.beginTransmission(0x53);
Wire.write(0x34); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte y0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x35); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte y1 = Wire.read();
y1 = y1 & 0x03;

uint16_t y = (y1 << 8) + y0;
int16_t yf = y;
if(yf > 511)
{
yf = yf - 1024;
}
float ya = yf * 0.004;
ycur = ycur + ya;


Wire.beginTransmission(0x53);
Wire.write(0x36); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte z0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x37); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte z1 = Wire.read();
z1 = z1 & 0x03;

uint16_t z = (z1 << 8) + z0;
int16_t zf = z;
if(zf > 511)
{
zf = zf - 1024;
}
float za = zf * 0.004;
zcur = zcur + za;
}
xcur = xcur/50; 
ycur = ycur/50;
zcur = zcur/50;

float acc = sqrt(((xcur - xavg) * (xcur - xavg)) + 
               ((ycur - yavg) * (ycur - yavg)) + 
               ((zcur - zavg) * (zcur - zavg)));
delay(250);

//Next Acceleration
for(int i = 0; i<50; i++){
Wire.beginTransmission(0x53);
Wire.write(0x32); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte x0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x33); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte x1 = Wire.read();
x1 = x1 & 0x03;

uint16_t x = (x1 << 8) + x0;
int16_t xf = x;
if(xf > 511)
{
xf = xf - 1024;
}
float xa = xf * 0.004;
xnxt = xnxt + xa;


Wire.beginTransmission(0x53);
Wire.write(0x34); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte y0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x35); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte y1 = Wire.read();
y1 = y1 & 0x03;

uint16_t y = (y1 << 8) + y0;
int16_t yf = y;
if(yf > 511)
{
yf = yf - 1024;
}
float ya = yf * 0.004;
ynxt = ynxt + ya;


Wire.beginTransmission(0x53);
Wire.write(0x36); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte z0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x37); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte z1 = Wire.read();
z1 = z1 & 0x03;

uint16_t z = (z1 << 8) + z0;
int16_t zf = z;
if(zf > 511)
{
zf = zf - 1024;
}
float za = zf * 0.004;
znxt = znxt + za;
}
xnxt = xnxt/50; 
ynxt = ynxt/50;
znxt = znxt/50;

float acc2 = sqrt(((xnxt - xavg) * (xnxt - xavg)) + 
               ((ynxt - yavg) * (ynxt - yavg)) + 
               ((znxt - zavg) * (znxt - zavg)));

if (acc2-acc > 0.05)
    {
      steps = steps + 1;
    }

display.clearDisplay();
display.setTextSize(2); 
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.print("steps: ");
display.println(steps);
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE);
display.print("Distance: ");
display.print(steps*0.3048);
display.println("M");
display.display();
delay(400);
}

void adxl345_init(){
Serial.begin(115200);
Wire.begin();

Wire.beginTransmission(0x53);
Wire.write(0x2C); 
Wire.write(0x08); 
Wire.endTransmission();

Wire.beginTransmission(0x53);
Wire.write(0x31); 
Wire.write(0x08); 
Wire.endTransmission();

Wire.beginTransmission(0x53);
Wire.write(0x2D); 
Wire.write(0x08); 
Wire.endTransmission();

}

void ssd1306_init(){
display.begin(SSD1306_SWITCHCAPVCC);
display.display();
delay(1000);
display.clearDisplay();
display.display();
delay(1000);
display.clearDisplay();
display.setTextSize(2); 
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.println("STEPS");
display.println("COUNTER");
display.display();
delay(1000);
}

float read_av_acc(){
for(int i = 0; i<50; i++){
Wire.beginTransmission(0x53);
Wire.write(0x32); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte x0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x33); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte x1 = Wire.read();
x1 = x1 & 0x03;

uint16_t x = (x1 << 8) + x0;
int16_t xf = x;
if(xf > 511)
{
xf = xf - 1024;
}
float xa = xf * 0.004;
xavg = xavg + xa;


Wire.beginTransmission(0x53);
Wire.write(0x34); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte y0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x35); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte y1 = Wire.read();
y1 = y1 & 0x03;

uint16_t y = (y1 << 8) + y0;
int16_t yf = y;
if(yf > 511)
{
yf = yf - 1024;
}
float ya = yf * 0.004;
yavg = yavg + ya;


Wire.beginTransmission(0x53);
Wire.write(0x36); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte z0 = Wire.read();

Wire.beginTransmission(0x53);
Wire.write(0x37); 
Wire.endTransmission();
Wire.requestFrom(0x53, 1);
byte z1 = Wire.read();
z1 = z1 & 0x03;

uint16_t z = (z1 << 8) + z0;
int16_t zf = z;
if(zf > 511)
{
zf = zf - 1024;
}
float za = zf * 0.004;
zavg = zavg + za;
}
xavg = xavg/50; 
yavg = yavg/50;
zavg = zavg/50;
}

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