I made Blynk controlled Car using Adafruit Feather 32u4 Bluefruit LE. I can easily using Blynk!

Configuration

I use the BLE equipped microcomputer Adafruit Feather 32u4 Bluefruit LE and the motor driver DRV8835 to control the rotation of the two motors by Blynk.

Parts

BLE-equipped microcomputer Adafruit Feather 32u4 bluefruit LE

Adafruit Feather 32u4 Bluefruit LE
Motor driver DRV8835

ＤＲＶ８８３５使用ステッピング＆ＤＣモータドライバモジュール: 組立キット秋月電子通商電子部品ネット通販
akizukidenshi.com

　
Li-ion polymer battery 400mAh

リチウムイオンポリマー電池400mAh - スイッチサイエンス
スイッチサイエンス

　
Double gearbox

タミヤ楽しい工作シリーズ No.168 ダブルギヤボックス左右独立4速タイプ (70168)

gear ratio is 344.2 : 1
　
Universal Plate

タミヤ楽しい工作シリーズ No.157 ユニバーサルプレート 2枚セット (70157)

　
Off-road tyre set

タミヤ楽しい工作シリーズ No.96 オフロードタイヤセット (70096)

　
Ball caster

タミヤ楽しい工作シリーズ No.144 ボールキャスター 2セット入 (70144)

Blynk Library for Arduino

Latest library is located in the following.
https://github.com/blynkkk/blynk-library

Adafruit Feather 32u4 Bluefruit LE. is used. So, Arduino code is generated in reference to the following.

[Example] -> [Blynk] -> [Boards_BLE]-> [Adafruit_Feather_32u4_BLE]

Blynk settings

Create a new project . Select the Arduino UNO in hardware, because there is no Adafruit Feather 32u4 BLE yet. AUTH TOKEN will make a note so you use at the time of Arduino code generation ( or to send mail ).

Place the BLE widget and the joystick widget.

Joystick setting. The values of the two-axis are output in virtual pin V0. The values of X and Y are -255 to 255, respectively.

Arduino IDE Code

[Sketch Example]-> [Blynk]-> [boards_ble]-> [Adafruit_Feather_32u4_BLE] code generated by reference.

#define BLYNK_PRINT Serial

#define BLYNK_USE_DIRECT_CONNECT

#include <BlynkSimpleSerialBLE.h>
#include <SPI.h>
#include <Adafruit_BLE.h>
#include <Adafruit_BluefruitLE_SPI.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YourAuthToken";

// SHARED SPI SETTINGS (see adafruit webpages for details)
#define BLUEFRUIT_SPI_CS               8
#define BLUEFRUIT_SPI_IRQ              7
#define BLUEFRUIT_SPI_RST              4    // Optional but recommended, set to -1 if unused
#define BLUEFRUIT_VERBOSE_MODE         true

// Create ble instance, see pinouts above
Adafruit_BluefruitLE_SPI ble(BLUEFRUIT_SPI_CS, BLUEFRUIT_SPI_IRQ, BLUEFRUIT_SPI_RST);

//pin name
const int  forwardL = 11;
const int  rearL = 10;
const int  forwardR = 5;
const int  rearR = 6;

long Speed;
long SpeedL, SpeedR;

BLYNK_WRITE(V0) {
  long x = param[0].asInt();
  long y = param[1].asInt();

  Serial.print("x: ");
  Serial.print(x);
  Serial.print("  y: ");
  Serial.print(y);

  Speed = sqrt(x*x+y*y);
  if(Speed > 255){
    Speed = 255;
  }
  Serial.print("  Speed: ");
  Serial.println(Speed);

  if(y >= 0){
    if(x >= 0){
      SpeedL = 0;
      SpeedR = abs(x);
    }else{
      SpeedL = abs(x);
      SpeedR = 0;
    }
    analogWrite(forwardL, Speed - SpeedL);
    analogWrite(rearL, 0);
    analogWrite(forwardR, Speed - SpeedR);
    analogWrite(rearR, 0);
  }else{
    if(x >= 0){
      SpeedL = 0;
      SpeedR = abs(x);
    }else{
      SpeedL = abs(x);
      SpeedR = 0;
    }
    analogWrite(forwardL, 0);
    analogWrite(rearL, Speed - SpeedL);
    analogWrite(forwardR, 0);
    analogWrite(rearR, Speed - SpeedR);
  }
}

void setup() {
  Serial.begin(9600);

  Blynk.begin(auth, ble);
  ble.begin(BLUEFRUIT_VERBOSE_MODE);
  ble.factoryReset(); // Optional
  ble.setMode(BLUEFRUIT_MODE_DATA);
}

void loop() {
  Blynk.run();
}

#define BLYNK_PRINT Serial

#define BLYNK_USE_DIRECT_CONNECT

#include <BlynkSimpleSerialBLE.h>

#include <SPI.h>

#include <Adafruit_BLE.h>

#include <Adafruit_BluefruitLE_SPI.h>

// You should get Auth Token in the Blynk App.

// Go to the Project Settings (nut icon).

char auth[] = "YourAuthToken";

// SHARED SPI SETTINGS (see adafruit webpages for details)

#define BLUEFRUIT_SPI_CS 8

#define BLUEFRUIT_SPI_IRQ 7

#define BLUEFRUIT_SPI_RST 4 // Optional but recommended, set to -1 if unused

#define BLUEFRUIT_VERBOSE_MODE true

// Create ble instance, see pinouts above

Adafruit_BluefruitLE_SPI ble(BLUEFRUIT_SPI_CS, BLUEFRUIT_SPI_IRQ, BLUEFRUIT_SPI_RST);

//pin name

const int forwardL = 11;

const int rearL = 10;

const int forwardR = 5;

const int rearR = 6;

long Speed;

long SpeedL, SpeedR;

BLYNK_WRITE(V0) {

long x = param[0].asInt();

long y = param[1].asInt();

Serial.print("x: ");

Serial.print(x);

Serial.print(" y: ");

Serial.print(y);

Speed = sqrt(x*x+y*y);

if(Speed > 255){

Speed = 255;

}

Serial.print(" Speed: ");

Serial.println(Speed);

if(y >= 0){

if(x >= 0){

SpeedL = 0;

SpeedR = abs(x);

}else{

SpeedL = abs(x);

SpeedR = 0;

}

analogWrite(forwardL, Speed - SpeedL);

analogWrite(rearL, 0);

analogWrite(forwardR, Speed - SpeedR);

analogWrite(rearR, 0);

}else{

if(x >= 0){

SpeedL = 0;

SpeedR = abs(x);

}else{

SpeedL = abs(x);

SpeedR = 0;

}

analogWrite(forwardL, 0);

analogWrite(rearL, Speed - SpeedL);

analogWrite(forwardR, 0);

analogWrite(rearR, Speed - SpeedR);

}

void setup() {

Serial.begin(9600);

Blynk.begin(auth, ble);

ble.begin(BLUEFRUIT_VERBOSE_MODE);

ble.factoryReset(); // Optional

ble.setMode(BLUEFRUIT_MODE_DATA);

}

void loop() {

Blynk.run();

}

You can now control two motors by receiving the two values of the Blynk joystick and move them back and forth!

Blynk Connecting BLE

Click on the BLE widget of the project.

Click on the “Connect BLE device”.

Then, conect to “Adafruit Bluefruit LE” by clicking “OK”.

Operation

動画プレーヤー

Media error: Format(s) not supported or source(s) not found

ファイルをダウンロード: https://homemadegarbage.com/wp/wp-content/uploads/2016/09/6ef7a9fb-ad36-4e2c-a177-37f2582e69f0.mp4?_=1

00:00

ボリューム調節には上下矢印キーを使ってください。

動画プレーヤー

Media error: Format(s) not supported or source(s) not found

ファイルをダウンロード: https://homemadegarbage.com/wp/wp-content/uploads/2016/09/8d25f613-cc73-4714-ba65-6a2542216427.mp4?_=2

00:00

ボリューム調節には上下矢印キーを使ってください。

In the future, I’d like to have this camera mounted on a head-mounted display (smartphone): roll:

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Configuration

Parts

Blynk Library for Arduino

Blynk settings

Arduino IDE Code

Blynk Connecting BLE

Operation

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