spider board

Ultra-fine 12-bit dimming for LED, 16 channels.

The spider board allows for a fine gradation ideal for LED.

The spider board is controlled by I²C by an arpschuino. The 12 bit dimming (4096 steps), at the frequency of 1526 Hz, permits an incomparable accuracy. Step 1 is 16 times dimmer than with conventional 8-bit gradation.

With the code we provide, each output is controlled by a DMX channel. A special curve allows a gradual increase of the luminous intensity of the LED. The board is not programmed so the code must be uploaded in the arpschuino.

The spider board is provided with 2 darlington transistor arrays that allows it to deliver 500 mA for each of its 16 outputs. These outputs can be coupled two by two and thus deliver 1A.

For higher power, the two HE10 connectors allow 2 arpowers to be connected for 2A outputs and up to 8A with a heat sink.

The spider boards are daisy chainable. Only one arpschuino can drive up to 64 spider boards! A dip switch is used to define the position of each board.

The spider board can also be controlled by any other board compatible with the I²C protocol (Arduino, Raspberry pi ...).

Specifications :

  • pca9685 LED driver: 12 bits, 1526 Hz, 16 outputs.
  • I²C control.
  • 2 darlingtons transistor arrays ULN2803, 48V, 500mA per output.
  • Addressing by dip-switches.
  • Dimensions : L=80 mm / l=59 mm / h=29mm

Price :

  • spider board kit (welded pca9685, the rest to be assembled) : 33€

Options :

  • assembly service : 11€

The arpschuino² is supplied in kit to assemble yourself. We can do the job for you on request. This may result in additional delay.

 ressources :

Spider board assembly guide (fr+en): PDF

Source code for arpschuino : ZIP

PCB : fritzing sources

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