Getting started with the ESP32 based Custom Dev Board
- VIN of CDB --> External +5V Supply
- GND of CDB --> GND of USB-UART
- TXD of CDB --> RXD of USB-UART
- RXD of CDB --> TXD of USB-UART
- EN of CDB --> DTR of USB-UART
- D0 of CDB --> RTS of USB-UART
ESP32 with FTDI Programmer
ESP Flasher Test Procedure
- Arduino 5V --> VIN of CDB
- Arduino GND --> GND of CDB
- Arduino RX --> RXD of CDB
- Arduino TX --> TXD of CDB
- Arduino RESET --> Arduino GND
- GND --> D0 of CDB
Continue by following this link
- R --> Pin 4
- G --> Pin 16
- B --> Pin 17
int red = D4;
int green = D16;
int blue = D17;
// the setup routine runs once when you press reset:
void setup()
{
// initialize the digital pin as an output.
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);
pinMode(blue, OUTPUT);
digitalWrite(red, HIGH);
digitalWrite(green, HIGH);
digitalWrite(blue, HIGH);
}
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(red, LOW); // turn the LED on
delay(1000); // wait for a second
digitalWrite(red, HIGH); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
digitalWrite(green, LOW); // turn the LED on
delay(1000); // wait for a second
digitalWrite(green, HIGH); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
digitalWrite(blue, LOW); // turn the LED on
delay(1000); // wait for a second
digitalWrite(blue, HIGH); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}
- SDA of CDB --> Pin 21 of CDB
- SCL of CDB --> Pin 22 of CDB
#include <Wire.h>
#include <WiFi.h>
const int MPU_addr=0x69; // I2C address of the MPU-6050
int16_t AcX,AcY,AcZ,Tmp,GyX,GyY,GyZ;
// WiFi network info.
const char *ssid = "Galaxy-M20"; // Enter your WiFi Name
const char *pass = "ac312124"; // Enter your WiFi Password
WiFiServer server(80);
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");
Serial.println("IP address is : ");
Serial.println(WiFi.localIP());
server.begin();
Serial.println("Server started");
}
void loop(){
mpu_read();
WiFiClient client = server.available();
if (client)
{
Serial.println("new client");
String currentLine = ""; //Storing the incoming data in the string
while (client.connected())
{
if (client.available()) //if there is some client data available
{
char c = client.read(); // read a byte
if (c == '\n') // check for newline character,
{
if (currentLine.length() == 0) //if line is blank it means its the end of the client HTTP request
{
client.print("<html><title> ESP32 WebServer</title></html>");
client.print("<body bgcolor=\"#E6E6FA\"><h1 style=\"text-align: center; color: blue\"> ESP32 WebServer </h1>");
client.print("<p style=\"text-align: left; color: red; font-size:150% \">Accelerometer Values: ");
client.print("<p style=\"text-align: left; font-size:150% \">AcX: ");
client.print(AcX);
client.print("<br/>AcY: ");
client.print(AcY);
client.print("<br/>AcZ: ");
client.print(AcZ);
client.print("<p style=\"text-align: left; color: red; font-size:150% \">Gyroscope Values: ");
client.print("<p style=\"text-align: left; font-size:150% \">GyX: ");
client.print(GyX);
client.print("<br/>GyY: ");
client.print(GyY);
client.print("<br/>GyZ: ");
client.print(GyZ);
client.print("</p></body>");
break; // break out of the while loop:
}
else
{ // if you got a newline, then clear currentLine:
currentLine = "";
}
}
else if (c != '\r')
{ // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
}
}
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)
Serial.print("Accelerometer Values: \n");
Serial.print("AcX: "); Serial.print(AcX); Serial.print("\nAcY: "); Serial.print(AcY); Serial.print("\nAcZ: "); Serial.print(AcZ);
//Serial.print("\nTemperature: " ); Serial.print(Tmp);
Serial.print("\nGyroscope Values: \n");
Serial.print("GyX: "); Serial.print(GyX); Serial.print("\nGyY: "); Serial.print(GyY); Serial.print("\nGyZ: "); Serial.print(GyZ);
Serial.print("\n");
delay(3000);
}
- Open Arduino IDE on your PC --> File --> Preferences -->
- Paste this in Board Manager URL "https://dl.espressif.com/dl/package_esp32_index.json"
- Now, Tools --> Board --> Board manager > Search for ESP32
- Download & install the latest version package
- Select board to "ESP32 Dev Module" for the CDB in the Board option
- J Phani Jayanth
- Sharanesh R