Hi I am trying to interface MPU6050 with ESP8266 for an IoT fall detection final year project. I am following this tutorial online but i keep getting an error message. Hope anyone can help
error msg:
In file included from C:\Users\raisah\Documents\Arduino\sketch_dec20a\sketch_dec20a.ino:5:0:
C:\Users\raisah\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\Wire/Wire.h: In function 'void mpu_read()':
C:\Users\raisah\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\Wire/Wire.h:71:13: note: candidate 1: uint8_t TwoWire::requestFrom(int, int, int)
uint8_t requestFrom(int, int, int);
^
C:\Users\raisah\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\Wire/Wire.h:65:12: note: candidate 2: size_t TwoWire::requestFrom(uint8_t, size_t, bool)
size_t requestFrom(uint8_t address, size_t size, bool sendStop);
^
C:\Users\raisah\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\Wire/Wire.h:71:13: note: candidate 1: uint8_t TwoWire::requestFrom(int, int, int)
uint8_t requestFrom(int, int, int);
^
C:\Users\raisah\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\Wire/Wire.h:65:12: note: candidate 2: size_t TwoWire::requestFrom(uint8_t, size_t, bool)
size_t requestFrom(uint8_t address, size_t size, bool sendStop);
^
Executable segment sizes:
IROM : 252884 - code in flash (default or ICACHE_FLASH_ATTR)
IRAM : 27560 / 32768 - code in IRAM (ICACHE_RAM_ATTR, ISRs...)
DATA : 1292 ) - initialized variables (global, static) in RAM/HEAP
RODATA : 1212 ) / 81920 - constants (global, static) in RAM/HEAP
BSS : 25480 ) - zeroed variables (global, static) in RAM/HEAP
Sketch uses 282948 bytes (27%) of program storage space. Maximum is 1044464 bytes.
Global variables use 27984 bytes (34%) of dynamic memory, leaving 53936 bytes for local variables. Maximum is 81920 bytes.
code used
// IoT based Fall Detection using NodeMCU and MPU6050 Sensor
//https://theiotprojects.com/iot-based-fall-detection-using-nodemcu-and-mpu6050-sensor/
#include <Wire.h>
#include <ESP8266WiFi.h>
const uint8_t MPU_addr=0x68; // I2C address of the MPU-6050
int16_t AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ;
float ax=0, ay=0, az=0, gx=0, gy=0, gz=0;
boolean fall = false; //stores if a fall has occurred
boolean trigger1=false; //stores if first trigger (lower threshold) has occurred
boolean trigger2=false; //stores if second trigger (upper threshold) has occurred
boolean trigger3=false; //stores if third trigger (orientation change) has occurred
byte trigger1count=0; //stores the counts past since trigger 1 was set true
byte trigger2count=0; //stores the counts past since trigger 2 was set true
byte trigger3count=0; //stores the counts past since trigger 3 was set true
int angleChange=0;
// WiFi network info.
const char *ssid = ""; // Enter your Wi-Fi Name
const char *pass = ""; // Enter your Wi-Fi Password
void send_event(const char *event);
const char *host = "";
const char *privateKey = "";
void setup(){
Serial.begin(115200);
Wire.begin();
Wire.beginTransmission(MPU_addr);
Wire.write(0x6B); // PWR_MGMT_1 register
Wire.write(0); // set to zero (wakes up the MPU-6050)
Wire.endTransmission(true);
Serial.println("Wrote to IMU");
Serial.println("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print("."); // print ... till not connected
}
Serial.println("");
Serial.println("WiFi connected");
}
void loop(){
mpu_read();
ax = (AcX-2050)/16384.00;
ay = (AcY-77)/16384.00;
az = (AcZ-1947)/16384.00;
gx = (GyX+270)/131.07;
gy = (GyY-351)/131.07;
gz = (GyZ+136)/131.07;
// calculating Amplitute vactor for 3 axis
float Raw_Amp = pow(pow(ax,2)+pow(ay,2)+pow(az,2),0.5);
int Amp = Raw_Amp * 10; // Mulitiplied by 10 bcz values are between 0 to 1
Serial.println(Amp);
if (Amp<=2 && trigger2==false){ //if AM breaks lower threshold (0.4g)
trigger1=true;
Serial.println("TRIGGER 1 ACTIVATED");
}
if (trigger1==true){
trigger1count++;
if (Amp>=12){ //if AM breaks upper threshold (3g)
trigger2=true;
Serial.println("TRIGGER 2 ACTIVATED");
trigger1=false; trigger1count=0;
}
}
if (trigger2==true){
trigger2count++;
angleChange = pow(pow(gx,2)+pow(gy,2)+pow(gz,2),0.5); Serial.println(angleChange);
if (angleChange>=30 && angleChange<=400){ //if orientation changes by between 80-100 degrees
trigger3=true; trigger2=false; trigger2count=0;
Serial.println(angleChange);
Serial.println("TRIGGER 3 ACTIVATED");
}
}
if (trigger3==true){
trigger3count++;
if (trigger3count>=10){
angleChange = pow(pow(gx,2)+pow(gy,2)+pow(gz,2),0.5);
//delay(10);
Serial.println(angleChange);
if ((angleChange>=0) && (angleChange<=10)){ //if orientation changes remains between 0-10 degrees
fall=true; trigger3=false; trigger3count=0;
Serial.println(angleChange);
}
else{ //user regained normal orientation
trigger3=false; trigger3count=0;
Serial.println("TRIGGER 3 DEACTIVATED");
}
}
}
if (fall==true){ //in event of a fall detection
Serial.println("FALL DETECTED");
send_event("fall_detect");
fall=false;
}
if (trigger2count>=6){ //allow 0.5s for orientation change
trigger2=false; trigger2count=0;
Serial.println("TRIGGER 2 DECACTIVATED");
}
if (trigger1count>=6){ //allow 0.5s for AM to break upper threshold
trigger1=false; trigger1count=0;
Serial.println("TRIGGER 1 DECACTIVATED");
}
delay(100);
}
void mpu_read(){
Wire.beginTransmission(MPU_addr);
Wire.write(0x3B); // starting with register 0x3B (ACCEL_XOUT_H)
Wire.endTransmission(false);
Wire.requestFrom(MPU_addr,14,true); // request a total of 14 registers
AcX=Wire.read()<<8|Wire.read(); // 0x3B (ACCEL_XOUT_H) & 0x3C (ACCEL_XOUT_L)
AcY=Wire.read()<<8|Wire.read(); // 0x3D (ACCEL_YOUT_H) & 0x3E (ACCEL_YOUT_L)
AcZ=Wire.read()<<8|Wire.read(); // 0x3F (ACCEL_ZOUT_H) & 0x40 (ACCEL_ZOUT_L)
Tmp=Wire.read()<<8|Wire.read(); // 0x41 (TEMP_OUT_H) & 0x42 (TEMP_OUT_L)
GyX=Wire.read()<<8|Wire.read(); // 0x43 (GYRO_XOUT_H) & 0x44 (GYRO_XOUT_L)
GyY=Wire.read()<<8|Wire.read(); // 0x45 (GYRO_YOUT_H) & 0x46 (GYRO_YOUT_L)
GyZ=Wire.read()<<8|Wire.read(); // 0x47 (GYRO_ZOUT_H) & 0x48 (GYRO_ZOUT_L)
}
void send_event(const char *event)
{
Serial.print("Connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("Connection failed");
return;
}
// We now create a URI for the request
String url = "/trigger/";
url += event;
url += "/with/key/";
url += privateKey;
Serial.print("Requesting URL: ");
Serial.println(url);
// This will send the request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
while(client.connected())
{
if(client.available())
{
String line = client.readStringUntil('\r');
Serial.print(line);
} else {
// No data yet, wait a bit
delay(50);
};
}
Serial.println();
Serial.println("closing connection");
client.stop();
}
