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Arduino Self-Balancing Robot
Hello, everyone!
In this instructable, 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 Arduino Pro Mini 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.
Diagram:
Components:
1) BO Gear Motor : https://roboman.in/mj5r
2) Smart Robot Car Tyres Wheels : https://roboman.in/ro6c
3) L298N 2A Based Motor Driver Module: https://roboman.in/s9hs
4) Arduino Nano: https://roboman.in/59h4
5) Arduino Nano Type C : https://roboman.in/xkfu
6) MPU-6050 3-Axis Accelerometer and Gyro Sensor : https://roboman.in/2ctr
7) 18650X2 Double Battery Cell Holder : https://roboman.in/pgdz
8) 18650 Lithium Battery 2500mah 3C :https://roboman.in/utwc
8) 18650 Lithium Battery 2600mah 3C :https://roboman.in/mmab
8) 18650 Lithium Battery 2200mah 1C :https://roboman.in/70b5
8) 18650 Lithium Battery 2000mah 1C :https://roboman.in/7em9
8) 18650 Lithium Battery 1800mah 1C :https://roboman.in/ywss
Library File:
Code:
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#include <PID_v1.h> #include <LMotorController.h> #include "I2Cdev.h" #include "MPU6050_6Axis_MotionApps20.h" #if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE #include "Wire.h" #endif #define MIN_ABS_SPEED 30 MPU6050 mpu; // MPU control/status vars bool dmpReady = false; // set true if DMP init was successful uint8_t mpuIntStatus; // holds actual interrupt status byte from MPU uint8_t devStatus; // return status after each device operation (0 = success, !0 = error) uint16_t packetSize; // expected DMP packet size (default is 42 bytes) uint16_t fifoCount; // count of all bytes currently in FIFO uint8_t fifoBuffer[64]; // FIFO storage buffer // orientation/motion vars Quaternion q; // [w, x, y, z] quaternion container VectorFloat gravity; // [x, y, z] gravity vector float ypr[3]; // [yaw, pitch, roll] yaw/pitch/roll container and gravity vector //PID double originalSetpoint = 174.50; double setpoint = originalSetpoint; double movingAngleOffset = 0.3; double input, output; //adjust these values to fit your own design double Kp = 40; double Kd = 1.6 ; double Ki = 140; PID pid(&input, &output, &setpoint, Kp, Ki, Kd, DIRECT); double motorSpeedFactorLeft = 0.6; double motorSpeedFactorRight = 0.6; //MOTOR CONTROLLER int ENA = 5; int IN1 = 6; int IN2 = 7; int IN3 = 9; int IN4 = 10; int ENB = 8; LMotorController motorController(ENA, IN1, IN2, ENB, IN3, IN4, motorSpeedFactorLeft, motorSpeedFactorRight); volatile bool mpuInterrupt = false; // indicates whether MPU interrupt pin has gone high void dmpDataReady() { mpuInterrupt = true; } void setup() { // join I2C bus (I2Cdev library doesn't do this automatically) #if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE Wire.begin(); TWBR = 24; // 400kHz I2C clock (200kHz if CPU is 8MHz) #elif I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_FASTWIRE Fastwire::setup(400, true); #endif mpu.initialize(); devStatus = mpu.dmpInitialize(); // supply your own gyro offsets here, scaled for min sensitivity mpu.setXGyroOffset(220); mpu.setYGyroOffset(76); mpu.setZGyroOffset(-85); mpu.setZAccelOffset(1788); // 1688 factory default for my test chip // make sure it worked (returns 0 if so) if (devStatus == 0) { // turn on the DMP, now that it's ready mpu.setDMPEnabled(true); // enable Arduino interrupt detection attachInterrupt(0, dmpDataReady, RISING); mpuIntStatus = mpu.getIntStatus(); // set our DMP Ready flag so the main loop() function knows it's okay to use it dmpReady = true; // get expected DMP packet size for later comparison packetSize = mpu.dmpGetFIFOPacketSize(); //setup PID pid.SetMode(AUTOMATIC); pid.SetSampleTime(10); pid.SetOutputLimits(-255, 255); } else { // ERROR! // 1 = initial memory load failed // 2 = DMP configuration updates failed // (if it's going to break, usually the code will be 1) Serial.print(F("DMP Initialization failed (code ")); Serial.print(devStatus); Serial.println(F(")")); } } void loop() { // if programming failed, don't try to do anything if (!dmpReady) return; // wait for MPU interrupt or extra packet(s) available while (!mpuInterrupt && fifoCount < packetSize) { //no mpu data - performing PID calculations and output to motors pid.Compute(); motorController.move(output, MIN_ABS_SPEED); } // reset interrupt flag and get INT_STATUS byte mpuInterrupt = false; mpuIntStatus = mpu.getIntStatus(); // get current FIFO count fifoCount = mpu.getFIFOCount(); // check for overflow (this should never happen unless our code is too inefficient) if ((mpuIntStatus & 0x10) || fifoCount == 1024) { // reset so we can continue cleanly mpu.resetFIFO(); Serial.println(F("FIFO overflow!")); // otherwise, check for DMP data ready interrupt (this should happen frequently) } else if (mpuIntStatus & 0x02) { // wait for correct available data length, should be a VERY short wait while (fifoCount < packetSize) fifoCount = mpu.getFIFOCount(); // read a packet from FIFO mpu.getFIFOBytes(fifoBuffer, packetSize); // track FIFO count here in case there is > 1 packet available // (this lets us immediately read more without waiting for an interrupt) fifoCount -= packetSize; mpu.dmpGetQuaternion(&q, fifoBuffer); mpu.dmpGetGravity(&gravity, &q); mpu.dmpGetYawPitchRoll(ypr, &q, &gravity); input = ypr[1] * 180/M_PI + 180; } } |
