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Published December 27, 2015 © MIT

LightBlue Demo Sketch

This sketch shows how the LightBlue iOS application Bean demo screen can be used.

Story

Introduction

LightBlue Explorer offers lots of features to help you test Bluetooth Low Energy devices. When LightBlue Explorer connects to a Bean, it offers a view that allows you to set the RGB LED. You can also read data from the accelerometer, analog pins, and digital pins.

This sketch shows how the LightBlue iOS application Bean demo screen can be used. When you connect to a Bean using LightBlue, it will open up the demo screen which probes the Bean for acceleration data, digital pin input values, analog input values, as well as sets the LED.

Software

LightBlue
Bean Loader

Hardware

LightBlue Bean
Windows or OS X computer

Program the Bean on the iOS Bean Loader

Open the iOS Bean Loader and create a new sketch. Paste the sketch shown below to the screen. Upload and compile the sketch. When you do this a list of Beans should show up. Tap on the Bean you want to program. Afterwards, close the app, and open the LightBlue iOS App.

Use the Bean to send data to LightBlue

Open the LightBlue app and choose the Bean you programmed from the Bean Loader.

High-Level Overview of the Code

When you run LightBlue Explorer and connect to a Bean, your app asks Bean for its information by sending the byte `0x02`.

Bean receives `0x02` and interprets it as a request for information from your iOS device. Bean responds with six bytes total:

Byte 1: 0x82 – Response to 0x02 (decimal value ‘2’ in hexadecimal)

Byte 2:the digital pin values, grouped together into one byte

Byte 3: the low byte of analog pin 1

Byte 4:the high byte of analog pin 1

Byte 5 the low byte of analog pin 2

Byte 6: the high byte of analog pin 2

LightBlue Explorer parses the response and visualizes the received data on your screen.

Troubleshooting

Having trouble with this guide? Reach out to BeanTalk to get directed feedback from our developers and community!

Code snippet #1

/*
  LightBlue Demo Sketch
 */
 
static int d0 = 0;
static int d1 = 1;
static int d2 = 2;
static int d3 = 3;
static int d4 = 4;
static int d5 = 5;
 
 
void setup() 
{
  // initialize serial communication at 57600 bits per second:
  Serial.begin(57600);
 
  Serial.setTimeout(25);
  
  // Digital pins
  pinMode(d0, INPUT_PULLUP);  
  pinMode(d1, INPUT_PULLUP);  
  pinMode(d2, INPUT_PULLUP);  
  pinMode(d3, INPUT_PULLUP); 
  pinMode(d4, INPUT_PULLUP);
  pinMode(d5, INPUT_PULLUP);
}
 
// the loop routine runs over and over again forever:
void loop() 
{
  char buffer[64];
  size_t readLength = 64;
  uint8_t length = 0;  
         
  length = Serial.readBytes(buffer, readLength);    
  
// Return all the serial pins
  if ( 0x02 == buffer[0] && 1 == length)
  {  
      pinMode(d0, INPUT_PULLUP);  //PD6
      pinMode(d1, INPUT_PULLUP);  //PB1
      pinMode(d2, INPUT_PULLUP);  //PB2
      pinMode(d3, INPUT_PULLUP); 
      pinMode(d4, INPUT_PULLUP);
      pinMode(d5, INPUT_PULLUP);
      
      int digital0 = digitalRead(d0);
      int digital1 = digitalRead(d1);
      int digital2 = digitalRead(d2);
      int digital3 = digitalRead(d3);
      int digital4 = digitalRead(d4);
      int digital5 = digitalRead(d5);
      int analog1 = analogRead(A0);
      int analog2 = analogRead(A1);
      
      uint8_t digitalAll = digital0 | ( digital1 << 1 ) | ( digital2 << 2 ) | ( digital3 << 3);
      digitalAll |= ( digital4 << 4 ) | ( digital5 << 5 );
      
      buffer[0] = 0x82;
      buffer[1] = digitalAll;
      buffer[2] = analog1 & 0xFF;
      buffer[3] = analog1 >> 8;
      buffer[4] = analog2 & 0xFF;
      buffer[5] = analog2 >> 8;
    
      Serial.write((uint8_t*)buffer, 6); 
    }
 
    Bean.sleep(1000000);  
}

Credits

Punch Through

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LightBlue Demo Sketch

LightBlue Demo Sketch

Story

Introduction

Program the Bean on the iOS Bean Loader

Use the Bean to send data to LightBlue

High-Level Overview of the Code

Troubleshooting

Code

Code snippet #1

Credits

Punch Through

Comments

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