BLE RGB LED PWM Controller based on arduino and hc-05 serial bluetooth board
This is a simple DIY Arduino based RGB LED PWM Controller used to control LEDs like RGB Strips via Bluetooth using an HC-05 module. It uses a serial connection via bluetooth to recieve rgb data to display on the LEDs. I used a Arduino Nano in the final circuit (as it has 6 PWM outputs suitable to drive two independent RGB Stripes), diagram is using a digispark-board (ATtiny85 based arduino compatible). You can switch out the digispark with every board you want, just remember to change Pins in the code.
- Finish circuit desgin
- Finish initial code
- Build PCB
- Build Android App as eyecandy interface for LEDcon
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- Finished Coding to ensure compatibility with different boards
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- Test all the possible configurations
- Finish PCB design to order
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| Arduino Nano | Digispark |
|---|---|
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- PCB
- Arduino compatible board (i.e. digispark, arduino nano, arduino pro, teensy etc)
- Bluetooth Serial Module (HC-06 or HC-05 should both work, only tested with HC-05
- 3x n-Channel MOSFETs (I used STP55NF06L 60V@55A as found on RAMPS 1.4 board)
the use of mosfets depends on the amount of LEDs you want to drive. If you want to drive a single RGB LED the current provided by arduino should be sufficient. Don't exceed the recommended max per pin!!
- DC in barrel jack
- Sufficient PSU >=12V
the voltage regulator used on arduino boards differ a lot. Check the datasheet to ensure your board can handle your voltage. Depending on your board you may even consider a laptop power brick, but remember this circuit is designed for use at 12V
The following components are not explicit neccessary, but highly recommended to guarantee stable use and longevity.
- electrolytic capacitor C1 (I used 2200uF @ 16V)
- 3x Resistors R-FET (using STP55NF06L I recommend 120Ω. You could also enhance the circuit with pulldown/-up resistors.)
- Voltage divider (I used 1kΩ as R-Tx and 2kΩ as R-GND)
the voltage divider simply consists of two resitros, while the one connected to ground has the doubled value of the first one bridging the Arduino Tx and HC-05 Rx pin, as this is designed to use with 3.3v the voltage divider knocks that 5v logic signal down. For further informatiojn on voltage dividers visit: https://learn.sparkfun.com/tutorials/voltage-dividers