HardwareΒΆ

This light sculpture includes 15 power LEDs. Each power LED has its own current source.

Each current source contains a NE555 working as a two-level controller. The average value of the current is 300 mA. The pin 4 of a NE555 is a reset pin, which can be used for intensity control via PWM. The next photo shows the LTspice model, which is available in the repository.

_images/LTspiceModelCurrentSourceNE555.png

To control all 14 current sources the Adafruit PCA9685 16-Channel Servo Driver, based on the IC PCA9685, is used.

This IC is controlled by an Arduino Uno. This board is based on the ATmega328P.