Editing Big LED Screen
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= The Big LED Screen = | |||
=== Overview === | === Overview === | ||
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* The 386 connects via ISA to a "buffer board" which looks to be a memory buffer and power conditioner. | * The 386 connects via ISA to a "buffer board" which looks to be a memory buffer and power conditioner. | ||
* The "buffer board" has most traces terminating to a socket with a missing chip, so we don't know what happened here. | * The "buffer board" has most traces terminating to a socket with a missing chip, so we don't know what happened here. | ||
==== Buffer board ==== | ==== Buffer board ==== | ||
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==== Daughterboards ==== | ==== Daughterboards ==== | ||
The daughterboards each have qty 3 UCN5832A ([[Image:Ucn5832.pdf]]) 32-bit shift registers (for a total of 96 bits) which drive an array of 32 by 48 pixels (for a total of 1536). The theory is the other end of the LEDs are connected to 16 different power sources, making all the LEDs addressable (96 * 16 = 1536). (The shift register does a current sink) | The daughterboards each have qty 3 UCN5832A ([[Image:Ucn5832.pdf]]) 32-bit shift registers (for a total of 96 bits) which drive an array of 32 by 48 pixels (for a total of 1536). The theory is the other end of the LEDs are connected to 16 different power sources, making all the LEDs addressable (96 * 16 = 1536). (The shift register does a current sink) | ||
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=== Overview === | === Overview === | ||
==== LED Hardware ==== | ==== LED Hardware ==== | ||
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The boarduinos have connections to the preexisting circuitry to tell which power source is in use at any time, and send the respective data to the shift registers for display. | The boarduinos have connections to the preexisting circuitry to tell which power source is in use at any time, and send the respective data to the shift registers for display. | ||
We also have an xbee | We also have an xbee wireless chip onboard so we don't have to open up the sign to talk to it. | ||
==== Software ==== | ==== Software ==== | ||
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=== Pin connections === | === Pin connections === | ||
Here are the pins that need to be connected other than power and ground: | Here are the pins that need to be connected other than power and ground: | ||
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Unfortunately this has very little processor time to spare since it's spending all its time clocking out the serial data. We're probably limited to very basic patterns on here. | Unfortunately this has very little processor time to spare since it's spending all its time clocking out the serial data. We're probably limited to very basic patterns on here. | ||