UCL IoT / Mbed 2 deprecated BLE_LED_Controller

Application for nRF51822 mbed KIT that controls the intensity of LED2 using the BLE UART Service. Works with the Android App BLE_mbed_Remote available here https://github.com/bennthomsen/BLE_mbed_Remote

Dependencies:   BLE_API mbed nRF51822

Fork of BLE_UART_LEDControl_Echo by UCL IoT

This program demonstrates the use of the BLE UART Service to receive and send commands in order to remotely control the operation. In this example the intensity of LED2 can be remotely controlled.

The program accepts commands of the form "led2 0.1" over the BLE UART Service and uses these to set the duty cycle of the PWM Output that is connected to LED2 on the nRF51822 mbed KIT.

An Example Android App is available here https://github.com/bennthomsen/BLE_mbed_Remote. The complete source code and Android Studio Project files are available and can simply be pulled into Android Studio. The App implements sending of text, LED on off Button and a slider to control the LED brightness. At this stage setting the switch to off sets the PWM duty cycle to 0.0, however due to the PWMOut implementation in mbed the LED is not completely off at this point.

Diff: main.cpp

Revision:
15:016434184568
Parent:
14:8ff3bfb6b19d
--- a/main.cpp	Wed Dec 17 22:47:39 2014 +0000
+++ b/main.cpp	Thu Dec 18 21:14:19 2014 +0000
@@ -28,15 +28,15 @@
 #define DEBUG(...) /* nothing */
 #endif /* #if NEED_CONSOLE_OUTPUT */
 
-#define LED2OFF "led2 off"
-#define LED2ON "led2 on"
+#define LED2CMD "led2"
+#define CMD_LENGTH 4
 
 
 //char rxPayload[CMD_SIZE];
 
 BLEDevice  ble;                               // Create Bluetooth object
 DigitalOut led1(LED1);                        // Set the pin attached to LED1 as an output
-DigitalOut led2(LED2);                        // Set the pin attached to LED2 as an output
+PwmOut led2(LED2);                        // Set the pin attached to LED2 as an output
 
 UARTService *uartServicePtr;
 
@@ -56,10 +56,14 @@
         DEBUG("Received string: '");
         DEBUG((const char *)params->data);             //Note the size of data expands to the largest string received. Need to use bytesRead to resize.
         DEBUG("'\n\r");
-        if (!strncmp(LED2ON,(const char *)params->data,bytesRead))  led2 = 1;   // If the received and command string are equal turn led2 on. Note strcmp returns 0 if strings are equal
-        if (!strncmp(LED2OFF,(const char *)params->data,bytesRead)) led2 = 0;   // If the received and command string are equal turn led2 off.
-                                                                                        //Toggle LED2 when data received
-        ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), params->data, bytesRead);   // Echo received characters back over BLE
+        if (!strncmp(LED2CMD,(const char *)params->data,CMD_LENGTH-1)){
+            float value;
+            char cmd[CMD_LENGTH];
+            sscanf((const char *)params->data, "%s %f", cmd, &value );
+            led2 = value;
+            DEBUG("Cmd: %s LED Level = %f\n\r", cmd, value);
+            }
+        ble.updateCharacteristicValue(uartServicePtr->getRXCharacteristicHandle(), params->data,bytesRead);   // Echo received characters back over BLE
     }
 }
 
@@ -72,7 +76,7 @@
 int main(void)
 {
     led1 = 1;
-    led2 = 0;
+    led2 = 0.5;
     Ticker ticker;                            // Create period timer
     ticker.attach(periodicCallback, 1);       // Attach ticker callback function with a period of 1 second