Hopefully this was successful, return to the main screen.Ĥ) The run button should be enabled. Once paired, the device will appear on the right hand side. When requested you will need to enter a pin number, which is usually 1234 for these devices. If not already paired, click on discover and wait for the device to appear in the list below. Click connect on the main screen of the app. Turn on power to your circuit so that the LED on the Bluetooth module starts flashing. Alternatively, select library and find the PWM LED demo panel.ģ) We need to connect the Bluetooth device. Edit the Send characters to 'R', 'G' and 'B' and the end characters to 'r', 'g' and 'b'. Edit the sliders so that the minimum value is 0 and the maximum 255. Until another non numerical character is received.ġ) Run the Bluetooth Electronics app, click edit, find an empty panel and select buttonsĢ) Add 3 Sliders for the Red, Green and Blue LEDs. To make sure that the arduino parses the integer value immediately rather than waiting around A final non numerical end character is also sent New brightness value, followed by the value. The 3 sliders will send a character ('R', 'G' or 'B' in this case) to tell the arduino to be ready to receive the It calls the parseInt() function which will read the next integer from the serial stream. When a slider identification character is received, in this case the 'R', 'G' or 'B' characters, Re-connect themĪnalogueWrite() takes two arguments, the pin number and a value which isĪn 8-bit number ranging from 0 (always low) to 255 (always high). Trying to communicate to two serial devices simultaneously on the same pins. Remove pins 0 and 1 connecting to the Bluetooth module otherwise the Arduino will get confused Open the Arduino software, select the correct COM Port and Arduino device in the Tools menu,Ĭopy and paste the sketch and click upload. PWM LED Brightness and Bluetooth Serial Link Demo //By keuwlsoft: 23rd Aug 2015 int Red_LED_Pin = 9 // PWM Pin for Red LED int Green_LED_Pin = 10 // PWM Pin for Green LED int Blue_LED_Pin = 11 // PWM Pin for Blue LED //Varibles to hold brightness values ranging from 0 (off) to 255 (fully on) int Red_value = 0 int Green_value = 0 int Blue_value = 0 char BluetoothData // the data received from bluetooth serial link void setup ( ) HIGH on the 5V logic circuitry on the Arduino. This is because the HIGH on 3.3V logic will still be recognised as a TX pin of the Bluetooth module does not need modification and can connect directly to theĪrduino RX pin. This is achieved in this demo with 20k and 10k resistors. Pin could damage it, such that a voltage divider should be used to supply a 3.3V Note that the Bluetooth module operates at 3.3V. Transmit (TX) connection need to be received by a (RX) connection. Module connects to the RX pin on the Arduino and visa versa. ![]() The Bluetooth module has 4 connections, GND, 5V, RX and TX. For this demo we use pins 9, 10 and 11 of theĪrduino Uno, setting them as outputs and then use the analogueWrite() command Width Modulation (PWM) capability and and that the connected pins correspond Whilst we are using an Arduino Uno for this demo, although you could useĪ different model if you prefer, just make sure it has 3 pins with Pulse Consult the data sheet for which lead corresponds to whichĬolour and for what the current rating is for each colour. A RGB LED has 4 leads, the longest being the common, and the other Whilst we have used 3 LEDs and used a 470 Ω resistor (resistance to use depends on LED) in series with them, a single RGB However it could also be achieved by splitting the 'on' states such that the state is alternated Like the Arduino, it could be treated like a duty cycle with the first 50% of the counts set as on. Note that there are multiple ways of achieving an on state for e.g. Modulated to be on for a part of the time. Thus a value of 0 will be offĪll the time, a value of 255 will be on all the time and anything in between will be pulse width Or at 490 Hz (for the 16 MHz Arduino Uno with default settings). Is held high until the requested analogue write value is reached. The Arduino analogueWrite() command uses PWM to achieve this. Signal can be used to control the power output to a device, such as the LEDs in this demo. Such that information can be encoded in the signal. Pulse Width Modulation (PWM) is all about turning a digital output on and off rapidly To control the amount of red, green and blue from the LED(s). The Bluetooth Electronics app is used with 3 sliders To communicate to an Android device with Bluetooth. ![]() This demo uses the Bluetooth HC-05 or HC-06 modules with an Arduino
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