256 Relays!

by Christian

  • 21,879 views
  • 18 comments
  • 64 respects

Control/Synchronize Hundreds of Relays at the Same Time

Project tutorial by Christian

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Connect OLED Screens and I2C Sensors Over 100ft Away!

Project tutorial by Christian

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  • 1 comment
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Toolbox 3


Smart Irrigation Controller

Project tutorial by Christian

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Basement/Crawlspace Ventilation System

Project tutorial by Christian

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Control Up to 65,280 Relays with Your Arduino!

Project tutorial by Christian

  • 61,439 views
  • 17 comments
  • 101 respects

  • Control Up to 65,280 Relays with Your Arduino! 8 months ago

    The GPIO pins of the IO Expander can be accessed and controlled like any other GPIO pin.
    http://www.zevendevelopment.com/ioexpander.html#gpio
    Or you can connect any of the supported sensors. All of the 16 IO pins can become ADC inputs as well from 0-5V inputs. The GPIO pins can sink ~20mA each.

  • Smart irrigation system about 1 year ago

    Great job guys! It's great to see young people building electronics. You will become future engineers. Keep up the good work!

  • 256 Relays! over 1 year ago

    Do you have a video that you can share that uses the WS2811 chips with 768 relays? The link you gave is with LED's and only 32 relays. It was a major pain to get more than 16 shifter chips to work over wire interconnects having to fight capacitance issues. I'm interested in how you solved that problem. If you have two synchronous circuits A and B, where A feeds in B, and both share the same clock then you have the issue if total Tpd(A) < Th(B) where Tpd is the combinational delay of the clock. At 5V typical propagation delay is 19ns, minimum propagation delay is 3ns and required hold time is 2ns. I've been in a cave too long, and I'm not familiar with Sin Shimozono? Thanks!

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