Data Firmware

Control Arduino Genuino 101 onboard LED from Android iOS via Bluetooth Low Energy BLE

From Arduino IDE with Arduino/Genuino 101 board installed, its a CallbackLED example to test Arduino/Genuino 101 Bluetooth Low Energy (BLE) capabilities to turn on and of the LED connected to Pin 13 from a Android or iOS.


In Arduino IDE, open and download the CallbackLED example:
- File > Examples > CurieBLE > CallbackLED

CallbackLED.ino

/*
 Copyright (c) 2015 Intel Corporation. All rights reserved.

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-
 1301 USA
*/


#include <CurieBLE.h>

const int ledPin = 13; // set ledPin to use on-board LED
BLEPeripheral blePeripheral; // create peripheral instance

BLEService ledService("19B10000-E8F2-537E-4F6C-D104768A1214"); // create service

// create switch characteristic and allow remote device to read and write
BLECharCharacteristic switchChar("19B10001-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite);

void setup() {
 Serial.begin(9600);
 pinMode(ledPin, OUTPUT); // use the LED on pin 13 as an output

 // set the local name peripheral advertises
 blePeripheral.setLocalName("LEDCB");
 // set the UUID for the service this peripheral advertises
 blePeripheral.setAdvertisedServiceUuid(ledService.uuid());

 // add service and characteristic
 blePeripheral.addAttribute(ledService);
 blePeripheral.addAttribute(switchChar);

 // assign event handlers for connected, disconnected to peripheral
 blePeripheral.setEventHandler(BLEConnected, blePeripheralConnectHandler);
 blePeripheral.setEventHandler(BLEDisconnected, blePeripheralDisconnectHandler);

 // assign event handlers for characteristic
 switchChar.setEventHandler(BLEWritten, switchCharacteristicWritten);
// set an initial value for the characteristic
 switchChar.setValue(0);

 // advertise the service
 blePeripheral.begin();
 Serial.println(("Bluetooth device active, waiting for connections..."));
}

void loop() {
 // poll peripheral
 blePeripheral.poll();
}

void blePeripheralConnectHandler(BLECentral& central) {
 // central connected event handler
 Serial.print("Connected event, central: ");
 Serial.println(central.address());
}

void blePeripheralDisconnectHandler(BLECentral& central) {
 // central disconnected event handler
 Serial.print("Disconnected event, central: ");
 Serial.println(central.address());
}

void switchCharacteristicWritten(BLECentral& central, BLECharacteristic& characteristic) {
 // central wrote new value to characteristic, update LED
 Serial.print("Characteristic event, written: ");

 if (switchChar.value()) {
 Serial.println("LED on");
 digitalWrite(ledPin, HIGH);
 } else {
 Serial.println("LED off");
 digitalWrite(ledPin, LOW);
 }
}

On smartphone with BLE, download "nRF Master Control Panel (BLE)" app:
nRF Master Control Panel is a powerful generic tool that allows you to scan, advertise and explore your Bluetooth Smart (BLE) devices and communicate with them. nRF MCP supports number of Bluetooth SIG adopted profiles including Device Firmware Update profile (DFU) from Nordic Semiconductors.
- Android
- iOS


reference: http://www.arduino.cc/en/Tutorial/Genuino101CurieBLECallbackLED

Get

Arduino Uno MAX7219 8x8 LED Matrix via SPI using LedControl Library

We can add LedControl Library to Arduino IDE, to control 8*8 LED Matrix with MAX7219 via SPI. LedControl is a library for the MAX7219 and the MAX7221 Led display driver.
(ref: http://wayoda.github.io/LedControl/)


Open the File > Examples > LedControl > LCDemoMatrix

LCDemoMatrix.ino

//We always have to include the library
#include "LedControl.h"

/*
 Now we need a LedControl to work with.
 ***** These pin numbers will probably not work with your hardware *****
 pin 12 is connected to the DataIn 
 pin 11 is connected to the CLK 
 pin 10 is connected to LOAD 
 We have only a single MAX72XX.
 */
LedControl lc=LedControl(12,11,10,1);

/* we always wait a bit between updates of the display */
unsigned long delaytime=100;

void setup() {
 /*
 The MAX72XX is in power-saving mode on startup,
 we have to do a wakeup call
 */
 lc.shutdown(0,false);
 /* Set the brightness to a medium values */
 lc.setIntensity(0,8);
 /* and clear the display */
 lc.clearDisplay(0);
}

/*
 This method will display the characters for the
 word "Arduino" one after the other on the matrix. 
 (you need at least 5x7 leds to see the whole chars)
 */
void writeArduinoOnMatrix() {
 /* here is the data for the characters */
 byte a[5]={B01111110,B10001000,B10001000,B10001000,B01111110};
 byte r[5]={B00111110,B00010000,B00100000,B00100000,B00010000};
 byte d[5]={B00011100,B00100010,B00100010,B00010010,B11111110};
 byte u[5]={B00111100,B00000010,B00000010,B00000100,B00111110};
 byte i[5]={B00000000,B00100010,B10111110,B00000010,B00000000};
 byte n[5]={B00111110,B00010000,B00100000,B00100000,B00011110};
 byte o[5]={B00011100,B00100010,B00100010,B00100010,B00011100};

 /* now display them one by one with a small delay */
 lc.setRow(0,0,a[0]);
 lc.setRow(0,1,a[1]);
 lc.setRow(0,2,a[2]);
 lc.setRow(0,3,a[3]);
 lc.setRow(0,4,a[4]);
 delay(delaytime);
 lc.setRow(0,0,r[0]);
 lc.setRow(0,1,r[1]);
 lc.setRow(0,2,r[2]);
 lc.setRow(0,3,r[3]);
 lc.setRow(0,4,r[4]);
 delay(delaytime);
 lc.setRow(0,0,d[0]);
 lc.setRow(0,1,d[1]);
 lc.setRow(0,2,d[2]);
 lc.setRow(0,3,d[3]);
 lc.setRow(0,4,d[4]);
 delay(delaytime);
 lc.setRow(0,0,u[0]);
 lc.setRow(0,1,u[1]);
 lc.setRow(0,2,u[2]);
 lc.setRow(0,3,u[3]);
 lc.setRow(0,4,u[4]);
 delay(delaytime);
 lc.setRow(0,0,i[0]);
 lc.setRow(0,1,i[1]);
 lc.setRow(0,2,i[2]);
 lc.setRow(0,3,i[3]);
 lc.setRow(0,4,i[4]);
 delay(delaytime);
 lc.setRow(0,0,n[0]);
 lc.setRow(0,1,n[1]);
 lc.setRow(0,2,n[2]);
 lc.setRow(0,3,n[3]);
 lc.setRow(0,4,n[4]);
 delay(delaytime);
 lc.setRow(0,0,o[0]);
 lc.setRow(0,1,o[1]);
 lc.setRow(0,2,o[2]);
 lc.setRow(0,3,o[3]);
 lc.setRow(0,4,o[4]);
 delay(delaytime);
 lc.setRow(0,0,0);
 lc.setRow(0,1,0);
 lc.setRow(0,2,0);
 lc.setRow(0,3,0);
 lc.setRow(0,4,0);
 delay(delaytime);
}

/*
 This function lights up a some Leds in a row.
 The pattern will be repeated on every row.
 The pattern will blink along with the row-number.
 row number 4 (index==3) will blink 4 times etc.
 */
void rows() {
 for(int row=0;row<8;row++) {
 delay(delaytime);
 lc.setRow(0,row,B10100000);
 delay(delaytime);
 lc.setRow(0,row,(byte)0);
 for(int i=0;i<row;i++) {
 delay(delaytime);
 lc.setRow(0,row,B10100000);
 delay(delaytime);
 lc.setRow(0,row,(byte)0);
 }
 }
}

/*
 This function lights up a some Leds in a column.
 The pattern will be repeated on every column.
 The pattern will blink along with the column-number.
 column number 4 (index==3) will blink 4 times etc.
 */
void columns() {
 for(int col=0;col<8;col++) {
 delay(delaytime);
 lc.setColumn(0,col,B10100000);
 delay(delaytime);
 lc.setColumn(0,col,(byte)0);
 for(int i=0;i<col;i++) {
 delay(delaytime);
 lc.setColumn(0,col,B10100000);
 delay(delaytime);
 lc.setColumn(0,col,(byte)0);
 }
 }
}

/* 
 This function will light up every Led on the matrix.
 The led will blink along with the row-number.
 row number 4 (index==3) will blink 4 times etc.
 */
void single() {
 for(int row=0;row<8;row++) {
 for(int col=0;col<8;col++) {
 delay(delaytime);
 lc.setLed(0,row,col,true);
 delay(delaytime);
 for(int i=0;i<col;i++) {
 lc.setLed(0,row,col,false);
 delay(delaytime);
 lc.setLed(0,row,col,true);
 delay(delaytime);
 }
 }
 }
}

void loop() { 
 writeArduinoOnMatrix();
 rows();
 columns();
 single();
}

Connect MAX7219 8x8 LED Matrix to Arduino Uno as stated in the example:
- pin 12 is connected to the DataIn
- pin 11 is connected to the CLK
- pin 10 is connected to LOAD (its cs marked on my sample)
- +5V to VCC
- GND to GND


Run.

Check the video:

Get

Blink NodeMCU on board LED using Arduino IDE with ESP8266 core for Arduino and more examples

To program NodeMCU in Arduino IDE, we have to install esp8266 board (ESP8266 core for Arduino) to Arduino IDE.

Add Additional Board Manager URL for ESP8266 board:
> File > Preference

Add "http://arduino.esp8266.com/stable/package_esp8266com_index.json" in Additional Board Manager URLs.


Add ESP8266 board to Arduino IDE:
- Open Boards Manager in Arduino IDE
- Search "esp8266" or "NodeMCU", you will find "esp8266 by ESP8266 Community". Install it.


Test:
Once esp8266 board installed, you can find an example to blink the on-board LED.
File > Examples > ESP8266 > Blink

/*
 ESP8266 Blink by Simon Peter
 Blink the blue LED on the ESP-01 module
 This example code is in the public domain
 
 The blue LED on the ESP-01 module is connected to GPIO1 
 (which is also the TXD pin; so we cannot use Serial.print() at the same time)
 
 Note that this sketch uses LED_BUILTIN to find the pin with the internal LED
*/

void setup() {
 pinMode(LED_BUILTIN, OUTPUT); // Initialize the LED_BUILTIN pin as an output
}

// the loop function runs over and over again forever
void loop() {
 digitalWrite(LED_BUILTIN, LOW); // Turn the LED on (Note that LOW is the voltage level
 // but actually the LED is on; this is because 
 // it is acive low on the ESP-01)
 delay(1000); // Wait for a second
 digitalWrite(LED_BUILTIN, HIGH); // Turn the LED off by making the voltage HIGH
 delay(2000); // Wait for two seconds (to demonstrate the active low LED)
}

You can upload it to NodeMCU, to toggle the on-board LED.


notice:
- Once the ModeMCU programmed, the original firmware will be erased. To restore the original firmware with Lua shell, you have to flash the firmware again.

Next:
- Read NodeMCU MAC address using Arduino IDE with esp8266 library
- Get my IP address
- Run diagnosis
- NodeMCU to read analog input, A0
- NodeMCU act as WiFi client to update dweet.io
- Display on 128x64 I2C OLED, using Adafruit SSD1306 and GFX libraries
- esp8266-OLED, another esp8266-Arduino library for I2C-OLED displays
- NodeMCU/ESP8266 act as AP (Access Point) and simplest Web Server
- NodeMCU/ESP8266 act as AP (Access Point) and web server to control GPIO
- NodeMCU/ESP8266 implement WebSocketsServer to control RGB LED
- NodeMCU/ESP8266 WebSocketsServer, load html from separate file in flash file system

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