Hello,
I am working on a project where I'm using an GPU-6050 accelerometer as a microphone, converting the acceleration data into audio data. I'm using a Wemos D1 board, and right now I can get samples from the accelerometer as fast as 700 samples/second without sending the data over wifi. However, the accelerometer will have to be remotely located and ideally not connected to a computer or ethernet. So, I'm trying to find a way to send the accelerometer data over wifi to a xampp server I have running on my machine. The issue with my code right now is I can only update my mysql table with accelerometer values using http.get() about 15 times a second. I also made a simple webpage that only takes the value from the get request and stores it in a php variable, and it looks like with that I'm only sending about 30 accelerometer values a second. I'd really like to preserve the sample rate of 700 samples/second that I get just using serial as best as I can and I'm wondering what the best way to do that is. Here is the code I'm currently using:
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266HTTPClient.h>
#include "Wire.h" // This library allows you to communicate with I2C devices.
const int MPU_ADDR = 0x68; // I2C address of the MPU-6050. If AD0 pin is set to HIGH, the I2C address will be 0x69.
int16_t accelerometer_x, accelerometer_y, accelerometer_z; // variables for accelerometer raw data
// replace the MAC address below by the MAC address printed on a sticker on the Arduino Shield 2
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
const char* ssid = "XXXX";
const char* pass = "XXXXXXXX";
HTTPClient http;
WiFiClient wifiClient;
//
String HTTP_METHOD = "GET";
String HOST_NAME = "XXXXX";
//String PATH_NAME = "/insert_accel.php";
//String queryString = "";
void setup() {
Serial.begin(115200);
delay(10);
Wire.begin();
Wire.beginTransmission(MPU_ADDR); // Begins a transmission to the I2C slave (GY-521 board)
Wire.write(0x6B); // PWR_MGMT_1 register
Wire.write(0); // set to zero (wakes up the MPU-6050)
Wire.endTransmission(true);
// Begin WiFi section
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
}
void loop() {
String link;
Wire.beginTransmission(MPU_ADDR);
Wire.write(0x3F); // starting with register 0x3B (ACCEL_XOUT_H) [MPU-6000 and MPU-6050 Register Map and Descriptions Revision 4.2, p.40]
Wire.endTransmission(false); // the parameter indicates that the Arduino will send a restart. As a result, the connection is kept active.
Wire.requestFrom(MPU_ADDR, 2, true); // request a total of 7*2=14 registers
// "Wire.read()<<8 | Wire.read();" means two registers are read and stored in the same variable
//accelerometer_x = Wire.read()<<8 | Wire.read(); // reading registers: 0x3B (ACCEL_XOUT_H) and 0x3C (ACCEL_XOUT_L)
//accelerometer_y = Wire.read()<<8 | Wire.read(); // reading registers: 0x3D (ACCEL_YOUT_H) and 0x3E (ACCEL_YOUT_L)
accelerometer_z = Wire.read()<<8 | Wire.read(); // reading registers: 0x3F (ACCEL_ZOUT_H) and 0x40 (ACCEL_ZOUT_L)
// print out data
Serial.println(accelerometer_z);
//queryString = "?accel_x=" + String(accelerometer_x) + "&accel_y=" + String(accelerometer_y) + "&accel_z=" + String(accelerometer_z);
link = HOST_NAME + "?accel_z=" + String(accelerometer_z);
http.begin(wifiClient, link);
int httpCode = http.GET();
//String payload = http.getString();
//Serial.println(httpCode); //Print HTTP return code
//Serial.println(payload); //Print request response payload
http.end(); //Close connection
}
Is there a faster way to do this? Any and all suggestions would be great.
Thanks
thank you!