Arduino Dual Controlled RC Car (Bluetooth and WiFi) : 3 Steps

7 years ago

I cant seem to find the code for the Arduino, the app doesn't seem to have the provision for loading it. I'm using a Galaxy S5 and the app looks much different than the example.

josapedm

Reply 7 years ago

Arduino code

#include
#include

// servo
Servo myservo;
SoftwareSerial esp(5,6);
int pos = 45;
const int analogpin = A0;
const int pinForward = 3;
const int pinReverse = 4;
const int BTState = 7; // Bluetooth state on pin 7 of arduino

// byte to receive from android
byte cmd;
char c;
int motorSpeed = 0; // default speed, from 0 to 255

void setup() {
// setup connection
Serial.begin(9600);
esp.begin(115200);
myservo.attach(9);

// setup pin mode
pinMode(analogPin, OUTPUT);
pinMode(pinForward, OUTPUT);
pinMode(pinReverse, OUTPUT);
pinMode(BTState, INPUT);
}

void loop() {
myservo.write(pos);
motorSpeed = 100;

// stop car when connection lost or bluetooth disconnected
if (digitalRead(BTState) == LOW)
{
c = 'S';
myservo.write(pos);
}

if (Serial.available() > 0)
{
cmd = Serial.read();

if (cmd == 'A')
{
motorSpeed = 100;
}
else if (cmd == 'B')
{
motorSpeed = 150;
}
else if (cmd == 'C')
{
motorSpeed = 200;
}
else if (cmd == 'D')
{
motorSpeed = 255;
}
} else if (esp.available() > 0) {

cmd = esp.read();

if (cmd == 'A')
{
motorSpeed = 100;
}
else if (cmd == 'B')
{
motorSpeed = 150;
}
else if (cmd == 'C')
{
motorSpeed = 200;
}
else if (cmd == 'D')
{
motorSpeed = 255;
}
}

analogWrite(analogPin, motorSpeed);

c = cmd;
Serial.println(c);

// FORWARD
if (c == 'F')
{
digitalWrite(pinForward, HIGH); digitalWrite(pinReverse, LOW);
}
// REVERSE
else if (c == 'G')
{
digitalWrite(pinForward, LOW); digitalWrite(pinReverse, HIGH);
}
// STOP
else if (c == 'S')
{
digitalWrite(pinForward, LOW); digitalWrite(pinReverse, LOW);
}
// RIGHT
else if (c == 'R')
{
pos = 90;
myservo.write(pos);
}
// LEFT
else if (c == 'L')
{
pos = 0; myservo.write(pos);
}
// STRAIGHT
else if (c == 'I')
{
pos = 45; myservo.write(pos);
}
}

mateoENP

Reply 3 years ago

Hola el codigo me tira un error stray 342 a que se refiere ?

zeesh1979

Reply 6 years ago

such a clever and simple approach you used to do this amazing task. i need some help on below:

1. you used ESP in your project but i couldnt see how you are using it in code. are you receiving commands from mobile via bluetooth or wifi?

2. I have HC-06 module. its STATE pin will tell me its connectivity status too or its only HC-05 who does this?

3. can i have android source code for mobile app?

i am working on similar project but to control my quadcopter. i used HC-06 succesfully but i can do good test coz i fear if BT is disconnected then i will loose my quad. i am not sure if HC-06 STATE pin really gives status of BT or no.

waiting for your support. God bless you.

josapedm

Reply 6 years ago

Question 1: I'm using ESP to receive command from my Androuino App.

Question 2: HC-06 has to state pin. You can do this using HC-05 module only.

Question 3: Sorry it's pretty complicated to give you my Android source code.

HC-06 state pin is not functioning. I've tried that before. You can only succeed using the HC-05 bluetooth module. It's the module I know that has a state capability in case you loose connection.

Let me know if you have more questions. I'll be happy to response and help you. You can also check my Android App if you want to make or suggest an improvement of if you want me to add more functionality to the app so that your need will be met using my app. I'm frequently updating my App based on the demand of my users. Thank you.

Good luck and God bless also...

All the best,

zeesh1979

Reply 6 years ago

Thanks Josapedm for your quick response which usually lacks on such forums. i totally agree with the complexity of your sharing android code but can you just tell me which java class you used for sending data?

for HC-06, you are right that state pin doesnt help u but were u able to find out what is the purpose of this STATE pin?

from your article, i can summarise the steps as below:

1. flash ESP with nodemcu_integer_0.9.6-dev_20150406.bin you put on github

2. connect ESP with pin 5 and 6 (skip BT part as main communication is via wifi)

3. send output to ESC to run motor

4. send control commands from android app

5. you are using BT just to make sure the connection with app is alive (dont we have similar function in ESP?)

josapedm

Reply 6 years ago

Hi,

BT state usually work when the connection is lost or there's no live connection between two devices. It work like a continuous talking of two devices once established the connection.

For the complete documentation or example code of java class. If you're familiar with Android Studio, you can view the example Bluetooth chat app from the IDE. I have used most of my java codes from this example. This is a very good starting point and I recommend it to you.

We can achieve the same functionality using esp and this will be implimented starting from my next updated lua script.

josapedm

Reply 7 years ago

The source code for arduino is available on the app in arduino code menu.

However if there's something wrong with the app. Could you take screen shots of the problem you're having with the app and kindly send it to me in this email: androuino.info@gmail.com.

I'll do my best to solve this issue.

Thanks‥.

zeesh1979

Reply 6 years ago

can you please share the ESP8266 library you used here and also did you programme it as well?

josapedm

Reply 6 years ago

Hi this is the link for my lua script: https://github.com/androuino/esp8266-files-for-fla... Yes I wrote it myself.

josapedm

Reply 7 years ago

Could you also provide me the Android Version of your Galaxy S5? Thanks.