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Description
Self Balancing Robot Using ESP32
Hey👋 guys! Welcome back In this New Project Today We will show you how to make a robot at home. This mini robot is very powerful and easy to make at home. You can make this Diy robot using some Components. Here I am using stepper motor to build this robot.
A self-balancing personal transporter is a single-person electric vehicle comprising a one- or two-wheeled platform on which the rider stands. Unlike other vehicles, it uses a self-balancing gyroscopic system for steering, changing directions depending on which way the rider leans.
I'll show you how to build a small self-balancing robot that can move around avoiding obstacles. This is a tiny robot measuring 4 inches wide and 4 inches tall and is based on the ESP32 development board and the MPU6050 accelerometer-gyroscope module.
In the steps that follow, we will see how to interface the MPU6050 with Arduino, how to measure the angle of inclination of the robot, how to use PID to make the robot stay balanced. An ultrasonic rangefinder is also added to the robot which prevents it from banging into obstacles as it wanders around.
Speedy detection of errors is possible. Balancing is done quickly and thus saves time, labour and money. The system helps reducing fraud.
The robot will only use a MPU6050 sensor for evaluating and navigating the terrain, a triple axis accelerometer and gyro for calculating angular velocities and accelerations, and Arduino.
In general, a humanoid robot is statically stable if its stability is maintained at any point in time of its movement [1]. Static stability is secured in the condition where the projection of the robot's center of gravity is at all times within the convex polygon defined by the feet that are currently touching the pad.
This Robot is special maked for IoT Project. Because I am a Robotic Software Engineer. I also make awesome Projects For Students & Makers. This is a small part to make a real Robot. Hope You like & Enjoy it.
Code
Code
Arduino
/*
* esp32_wifi_balancing_robot.ino
*
* Created on: 23.02.2021
* Author: anonymous
*/
#include <Wire.h>
#include <WiFi.h>
#include <ArduinoOTA.h>
#include <Arduino.h>
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include "Control.h"
#include "MPU6050.h"
#include "Motors.h"
#include "defines.h"
#include "globals.h"
#include <stdio.h>
#include "esp_types.h"
#include "soc/timer_group_struct.h"
#include "driver/periph_ctrl.h"
#include "driver/timer.h"
#include "driver/ledc.h"
#include "esp32-hal-ledc.h"
const char* PARAM_FADER1 = "fader1";
const char* PARAM_FADER2 = "fader2";
const char* PARAM_PUSH1 = "push1";
const char* PARAM_PUSH2 = "push2";
const char* PARAM_PUSH3 = "push3";
const char* PARAM_PUSH4 = "push4";
const char* PARAM_TOGGLE1 = "toggle1";
const char* PARAM_FADER3 = "fader3";
const char* PARAM_FADER4 = "fader4";
const char* PARAM_FADER5 = "fader5";
const char* PARAM_FADER6 = "fader6";
/* Wifi Crdentials */
String sta_ssid = ""; // set Wifi network you want to connect to
String sta_password = ""; // set password for Wifi network
unsigned long previousMillis = 0;
AsyncWebServer server(80);
void initMPU6050() {
MPU6050_setup();
delay(500);
MPU6050_calibrate();
}
void initTimers();
void notFound(AsyncWebServerRequest *request) {
request->send(404, "text/plain", "Not found");
}
void setup() {
Serial.begin(115200); // set up seriamonitor at 115200 bps
Serial.setDebugOutput(true);
Serial.println();
Serial.println("*ESP32 Wifi Balancing Robot*");
Serial.println("--------------------------------------------------------");
pinMode(PIN_ENABLE_MOTORS, OUTPUT);
digitalWrite(PIN_ENABLE_MOTORS, HIGH);
pinMode(PIN_MOTOR1_DIR, OUTPUT);
pinMode(PIN_MOTOR1_STEP, OUTPUT);
pinMode(PIN_MOTOR2_DIR, OUTPUT);
pinMode(PIN_MOTOR2_STEP, OUTPUT);
pinMode(PIN_SERVO, OUTPUT);
pinMode(PIN_LED, OUTPUT);
digitalWrite(PIN_LED, LOW);
pinMode(PIN_WIFI_LED, OUTPUT);
digitalWrite(PIN_WIFI_LED, LOW);
pinMode(PIN_BUZZER, OUTPUT);
digitalWrite(PIN_BUZZER, LOW);
ledcSetup(6, 50, 16); // channel 6, 50 Hz, 16-bit width
ledcAttachPin(PIN_SERVO, 6); // GPIO 22 assigned to channel 1
delay(50);
ledcWrite(6, SERVO_AUX_NEUTRO);
Wire.begin();
initMPU6050();
// Set NodeMCU Wifi hostname based on chip mac address
char chip_id[15];
snprintf(chip_id, 15, "%04X", (uint16_t)(ESP.getEfuseMac()>>32));
String hostname = "esp32brobot-" + String(chip_id);
Serial.println();
Serial.println("Hostname: "+hostname);
// first, set NodeMCU as STA mode to connect with a Wifi network
WiFi.mode(WIFI_STA);
WiFi.begin(sta_ssid.c_str(), sta_password.c_str());
Serial.println("");
Serial.print("Connecting to: ");
Serial.println(sta_ssid);
Serial.print("Password: ");
Serial.println(sta_password);
// try to connect with Wifi network about 8 seconds
unsigned long currentMillis = millis();
previousMillis = currentMillis;
while (WiFi.status() != WL_CONNECTED && currentMillis - previousMillis <= 8000) {
delay(500);
Serial.print(".");
currentMillis = millis();
}
// if failed to connect with Wifi network set NodeMCU as AP mode
IPAddress myIP;
if (WiFi.status() == WL_CONNECTED) {
Serial.println("");
Serial.println("*WiFi-STA-Mode*");
Serial.print("IP: ");
myIP=WiFi.localIP();
Serial.println(myIP);
digitalWrite(PIN_WIFI_LED, HIGH); // Wifi LED on when connected to Wifi as STA mode
delay(2000);
} else {
WiFi.mode(WIFI_AP);
WiFi.softAP(hostname.c_str());
myIP = WiFi.softAPIP();
Serial.println("");
Serial.println("WiFi failed connected to " + sta_ssid);
Serial.println("");
Serial.println("*WiFi-AP-Mode*");
Serial.print("AP IP address: ");
Serial.println(myIP);
digitalWrite(PIN_WIFI_LED, LOW); // Wifi LED off when status as AP mode
delay(2000);
}
// Send a GET request to <ESP_IP>/?fader=<inputValue>
server.on("/", HTTP_GET, [] (AsyncWebServerRequest *request) {
String inputValue;
String inputMessage;
OSCnewMessage = 1;
// Get value for Forward/Backward
if (request->hasParam(PARAM_FADER1)) {
OSCpage = 1;
inputValue = request->getParam(PARAM_FADER1)->value();
inputMessage = PARAM_FADER1;
OSCfader[0] = inputValue.toFloat();
}
// Get value for Right/Left
else if (request->hasParam(PARAM_FADER2)) {
OSCpage = 1;
inputValue = request->getParam(PARAM_FADER2)->value();
inputMessage = PARAM_FADER2;
OSCfader[1] = inputValue.toFloat();
}
// Get value for Servo0
else if (request->hasParam(PARAM_PUSH1)) {
OSCpage = 1;
inputValue = request->getParam(PARAM_PUSH1)->value();
inputMessage = PARAM_PUSH1;
if(inputValue.equals("1")) OSCpush[0]=1;
else OSCpush[0]=0;
}
// Get value for Setting
else if (request->hasParam(PARAM_PUSH2)) {
OSCpage = 2;
inputValue = request->getParam(PARAM_PUSH2)->value();
inputMessage = PARAM_PUSH2;
if(inputValue.equals("1")) OSCpush[2]=1;
else OSCpush[2]=0;
}
// Get value for Buzzer
else if (request->hasParam(PARAM_PUSH3)) {
inputValue = request->getParam(PARAM_PUSH3)->value();
inputMessage = PARAM_PUSH3;
if(inputValue.equals("1")) {
digitalWrite(PIN_BUZZER, HIGH);
delay(150);
digitalWrite(PIN_BUZZER, LOW);
delay(80);
digitalWrite(PIN_BUZZER, HIGH);
delay(150);
digitalWrite(PIN_BUZZER, LOW);
delay(80);
}
}
// Get value for Led
else if (request->hasParam(PARAM_PUSH4)) {
inputValue = request->getParam(PARAM_PUSH4)->value();
inputMessage = PARAM_PUSH4;
if(inputValue.equals("1")) digitalWrite(PIN_LED, HIGH);
else digitalWrite(PIN_LED, LOW);
}
// Get value for mode PRO
else if (request->hasParam(PARAM_TOGGLE1)) {
OSCpage = 1;
inputValue = request->getParam(PARAM_TOGGLE1)->value();
inputMessage = PARAM_TOGGLE1;
if(inputValue.equals("1")) OSCtoggle[0]=1;
else OSCtoggle[0]=0;
}
// Get value for P-Stability
else if (request->hasParam(PARAM_FADER3)) {
OSCpage = 2;
inputValue = request->getParam(PARAM_FADER3)->value();
inputMessage = PARAM_FADER3;
OSCfader[0] = inputValue.toFloat();
}
// Get value for D-Stability
else if (request->hasParam(PARAM_FADER4)) {
OSCpage = 2;
inputValue = request->getParam(PARAM_FADER4)->value();
inputMessage = PARAM_FADER4;
OSCfader[0] = inputValue.toFloat();
}
// Get value for P-Speed
else if (request->hasParam(PARAM_FADER5)) {
OSCpage = 2;
inputValue = request->getParam(PARAM_FADER5)->value();
inputMessage = PARAM_FADER5;
OSCfader[0] = inputValue.toFloat();
}
// Get value for I-Speed
else if (request->hasParam(PARAM_FADER6)) {
OSCpage = 2;
inputValue = request->getParam(PARAM_FADER6)->value();
inputMessage = PARAM_FADER6;
OSCfader[0] = inputValue.toFloat();
}
else {
inputValue = "No message sent";
}
Serial.println(inputMessage+'='+inputValue);
request->send(200, "text/text", "");
});
server.onNotFound (notFound); // when a client requests an unknown URI (i.e. something other than "/"), call function "handleNotFound"
server.begin(); // actually start the server
initTimers();
// default neutral values
OSCfader[0] = 0.5;
OSCfader[1] = 0.5;
OSCfader[2] = 0.5;
OSCfader[3] = 0.5;
digitalWrite(PIN_ENABLE_MOTORS, LOW);
for (uint8_t k = 0; k < 5; k++) {
setMotorSpeedM1(5);
setMotorSpeedM2(5);
ledcWrite(6, SERVO_AUX_NEUTRO + 250);
delay(200);
setMotorSpeedM1(-5);
setMotorSpeedM2(-5);
ledcWrite(6, SERVO_AUX_NEUTRO - 250);
delay(200);
}
ledcWrite(6, SERVO_AUX_NEUTRO);
ArduinoOTA.begin(); // enable to receive update/upload firmware via Wifi OTA
}
void loop() {
ArduinoOTA.handle();
if (OSCnewMessage) {
OSCnewMessage = 0;
processOSCMsg();
}
timer_value = micros();
if (MPU6050_newData()) {
MPU6050_read_3axis();
dt = (timer_value - timer_old) * 0.000001; // dt in seconds
//Serial.println(timer_value - timer_old);
timer_old = timer_value;
angle_adjusted_Old = angle_adjusted;
// Get new orientation angle from IMU (MPU6050)
float MPU_sensor_angle = MPU6050_getAngle(dt);
angle_adjusted = MPU_sensor_angle + angle_offset;
if ((MPU_sensor_angle > -15) && (MPU_sensor_angle < 15))
angle_adjusted_filtered = angle_adjusted_filtered * 0.99 + MPU_sensor_angle * 0.01;
// We calculate the estimated robot speed:
// Estimated_Speed = angular_velocity_of_stepper_motors(combined) - angular_velocity_of_robot(angle measured by IMU)
actual_robot_speed = (speed_M1 + speed_M2) / 2; // Positive: forward
int16_t angular_velocity = (angle_adjusted - angle_adjusted_Old) * 25.0; // 25 is an empirical extracted factor to adjust for real units
int16_t estimated_speed = -actual_robot_speed + angular_velocity;
estimated_speed_filtered = estimated_speed_filtered * 0.9 + (float) estimated_speed * 0.1; // low pass filter on estimated speed
if (positionControlMode) {
// POSITION CONTROL. INPUT: Target steps for each motor. Output: motors speed
motor1_control = positionPDControl(steps1, target_steps1, Kp_position, Kd_position, speed_M1);
motor2_control = positionPDControl(steps2, target_steps2, Kp_position, Kd_position, speed_M2);
// Convert from motor position control to throttle / steering commands
throttle = (motor1_control + motor2_control) / 2;
throttle = constrain(throttle, -190, 190);
steering = motor2_control - motor1_control;
steering = constrain(steering, -50, 50);
}
// ROBOT SPEED CONTROL: This is a PI controller.
// input:user throttle(robot speed), variable: estimated robot speed, output: target robot angle to get the desired speed
target_angle = speedPIControl(dt, estimated_speed_filtered, throttle, Kp_thr, Ki_thr);
target_angle = constrain(target_angle, -max_target_angle, max_target_angle); // limited output
// Stability control (100Hz loop): This is a PD controller.
// input: robot target angle(from SPEED CONTROL), variable: robot angle, output: Motor speed
// We integrate the output (sumatory), so the output is really the motor acceleration, not motor speed.
control_output += stabilityPDControl(dt, angle_adjusted, target_angle, Kp, Kd);
control_output = constrain(control_output, -MAX_CONTROL_OUTPUT, MAX_CONTROL_OUTPUT); // Limit max output from control
// The steering part from the user is injected directly to the output
motor1 = control_output + steering;
motor2 = control_output - steering;
// Limit max speed (control output)
motor1 = constrain(motor1, -MAX_CONTROL_OUTPUT, MAX_CONTROL_OUTPUT);
motor2 = constrain(motor2, -MAX_CONTROL_OUTPUT, MAX_CONTROL_OUTPUT);
int angle_ready;
if (OSCpush[0]) // If we press the SERVO button we start to move
angle_ready = 82;
else
angle_ready = 74; // Default angle
if ((angle_adjusted < angle_ready) && (angle_adjusted > -angle_ready)) // Is robot ready (upright?)
{
// NORMAL MODE
digitalWrite(PIN_ENABLE_MOTORS, LOW); // Motors enable
// NOW we send the commands to the motors
setMotorSpeedM1(motor1);
setMotorSpeedM2(motor2);
} else // Robot not ready (flat), angle > angle_ready => ROBOT OFF
{
digitalWrite(PIN_ENABLE_MOTORS, HIGH); // Disable motors
setMotorSpeedM1(0);
setMotorSpeedM2(0);
PID_errorSum = 0; // Reset PID I term
Kp = KP_RAISEUP; // CONTROL GAINS FOR RAISE UP
Kd = KD_RAISEUP;
Kp_thr = KP_THROTTLE_RAISEUP;
Ki_thr = KI_THROTTLE_RAISEUP;
// RESET steps
steps1 = 0;
steps2 = 0;
positionControlMode = false;
OSCmove_mode = false;
throttle = 0;
steering = 0;
}
// Push1 Move servo arm
if (OSCpush[0]) {
if (angle_adjusted > -40)
ledcWrite(6, SERVO_MAX_PULSEWIDTH);
else
ledcWrite(6, SERVO_MIN_PULSEWIDTH);
} else
ledcWrite(6, SERVO_AUX_NEUTRO);
// Servo2
//ledcWrite(6, SERVO2_NEUTRO + (OSCfader[2] - 0.5) * SERVO2_RANGE);
// Normal condition?
if ((angle_adjusted < 56) && (angle_adjusted > -56)) {
Kp = Kp_user; // Default user control gains
Kd = Kd_user;
Kp_thr = Kp_thr_user;
Ki_thr = Ki_thr_user;
} else // We are in the raise up procedure => we use special control parameters
{
Kp = KP_RAISEUP; // CONTROL GAINS FOR RAISE UP
Kd = KD_RAISEUP;
Kp_thr = KP_THROTTLE_RAISEUP;
Ki_thr = KI_THROTTLE_RAISEUP;
}
} // End of new IMU data
}
void processOSCMsg() {
if (OSCpage == 1) {
if (modifing_control_parameters) // We came from the settings screen
{
OSCfader[0] = 0.5; // default neutral values
OSCfader[1] = 0.5; // default neutral values
OSCtoggle[0] = 0; // Normal mode
mode = 0;
modifing_control_parameters = false;
}
if (OSCmove_mode) {
Serial.print("M ");
Serial.print(OSCmove_speed);
Serial.print(" ");
Serial.print(OSCmove_steps1);
Serial.print(",");
Serial.println(OSCmove_steps2);
positionControlMode = true;
OSCmove_mode = false;
target_steps1 = steps1 + OSCmove_steps1;
target_steps2 = steps2 + OSCmove_steps2;
} else {
positionControlMode = false;
throttle = (OSCfader[0] - 0.5) * max_throttle;
// We add some exponential on steering to smooth the center band
steering = OSCfader[1] - 0.5;
if (steering > 0)
steering = (steering * steering + 0.5 * steering) * max_steering;
else
steering = (-steering * steering + 0.5 * steering) * max_steering;
}
if ((mode == 0) && (OSCtoggle[0])) {
// Change to PRO mode
max_throttle = MAX_THROTTLE_PRO;
max_steering = MAX_STEERING_PRO;
max_target_angle = MAX_TARGET_ANGLE_PRO;
mode = 1;
}
if ((mode == 1) && (OSCtoggle[0] == 0)) {
// Change to NORMAL mode
max_throttle = MAX_THROTTLE;
max_steering = MAX_STEERING;
max_target_angle = MAX_TARGET_ANGLE;
mode = 0;
}
} else if (OSCpage == 2) { // OSC page 2
if (!modifing_control_parameters) {
for (uint8_t i = 0; i < 4; i++)
OSCfader[i] = 0.5;
OSCtoggle[0] = 0;
modifing_control_parameters = true;
//OSC_MsgSend("$P2", 4);
}
// User could adjust KP, KD, KP_THROTTLE and KI_THROTTLE (fadder3,4,5,6)
// Now we need to adjust all the parameters all the times because we dont know what parameter has been moved
Kp_user = KP * 2 * OSCfader[0];
Kd_user = KD * 2 * OSCfader[1];
Kp_thr_user = KP_THROTTLE * 2 * OSCfader[2];
Ki_thr_user = KI_THROTTLE * 2 * OSCfader[3];
// Send a special telemetry message with the new parameters
char auxS[50];
sprintf(auxS, "$tP,%d,%d,%d,%d", int(Kp_user * 1000), int(Kd_user * 1000), int(Kp_thr_user * 1000), int(Ki_thr_user * 1000));
//OSC_MsgSend(auxS, 50);
// Calibration mode??
if (OSCpush[2] == 1) {
Serial.print("Calibration MODE ");
angle_offset = angle_adjusted_filtered;
Serial.println(angle_offset);
}
// Kill robot => Sleep
while (OSCtoggle[0] == 1) {
//Reset external parameters
PID_errorSum = 0;
timer_old = millis();
setMotorSpeedM1(0);
setMotorSpeedM2(0);
digitalWrite(PIN_ENABLE_MOTORS, HIGH); // Disable motors
}
}
}
Schematic and Layout
Schematic_ESP32 Wi-Fi Self Balancing Robot_2022-05-12.png
CAD-Custom parts and enclosures
Stepper Motor Coupler.stl
Hub_[V10_ENLARGED.stl
Wheel_[V11_FOR_O-RING_nytrile.stl
Stepper Motor Coupler_2.stl
Right Panel.stl
Left panel.stl
Right Eye.stl
Left Eye.stl
Upper Base.stl
Right Lag.stl
Lower Base.stl
Left Lag.stl
Hand.stl
Cover.stl
Sep 15,2023
2,519 views
Self Balancing Robot Using ESP32
A Smart Self Balancing Robot Using ESP32
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Published: Sep 15,2023
Download Gerber file 44
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File Last Updated: 2023/09/16 (GMT+8)
File update record
2023-09-1616:43:48
CAD or technical drawing file is updated.
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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