EvilGenius
Member
Hello
I am working on a new LED lighting project that will utilize multiple 5V Intelligent (WS2811 Based) RGB Pixel Strings.
I would like to build an animated tree where one SPI signal comes in and then splits out to many synchronized signal output each attached to a smart string of pixels. I know from experimenting I can branch out 2 from Data Output of the WS2811 into 2 WS2811 devices and continue with two strings. But that is not enough for what I have in mind. I need the capability of outputting 16, WS2811 with their own attached string.
Imagine a tree with a big trunk that splits into 16 main branches at the base.
Datasheet for WS2811 is attached for your references.
General concept for the device: A) Receive the data in the SPI format from the previous WS2811 pixel. B) Amplify the signal C) Split the signal into 16 Outputs D) Amplify the individual outputs
From what I could tell in the datasheet, I need the internal devices to be fast speed (at least 1Mhz) to keep up with the data transitions. Input current to the device (from previous pixel) at max is about 10ma, and the voltage level input to the device is low at 0.3Vdd (range between 1.8v to 2.1v) and the high at 0.7Vdd (range between 4.2v to 4.9V)
I was thinking of using bunch of 5V Compactor amplifiers (op-amps). One as master amplifier to boost the signal, and 16 more to isolate, amplify and output the data for the pixel strings. All op-amps to operate as non-inverting (data connected to +V). The negative leg of op-amps to have a reference voltage of 2.5V accomplished by a simple 10K voltage divider.
Here are the questions:
1- Will this work?
2- What op-amp do you suggest since I need 1Mhz switching and single source 5V? Can the master op-amp handle 16 outputs?
3- Since op-amps will share the supply voltage with 5V pixels, should I worry about the switching of pixels effecting the op-amp operation? Decoupling capacitor?
4- I am open to suggestion for any ideas specially the ones that are low cost!?
5- I have searched the net and could not find anything useful. Any source for additional info and ideas are very much welcomed.
Regards,
Rom
I am working on a new LED lighting project that will utilize multiple 5V Intelligent (WS2811 Based) RGB Pixel Strings.
I would like to build an animated tree where one SPI signal comes in and then splits out to many synchronized signal output each attached to a smart string of pixels. I know from experimenting I can branch out 2 from Data Output of the WS2811 into 2 WS2811 devices and continue with two strings. But that is not enough for what I have in mind. I need the capability of outputting 16, WS2811 with their own attached string.
Imagine a tree with a big trunk that splits into 16 main branches at the base.
Datasheet for WS2811 is attached for your references.
General concept for the device: A) Receive the data in the SPI format from the previous WS2811 pixel. B) Amplify the signal C) Split the signal into 16 Outputs D) Amplify the individual outputs
From what I could tell in the datasheet, I need the internal devices to be fast speed (at least 1Mhz) to keep up with the data transitions. Input current to the device (from previous pixel) at max is about 10ma, and the voltage level input to the device is low at 0.3Vdd (range between 1.8v to 2.1v) and the high at 0.7Vdd (range between 4.2v to 4.9V)
I was thinking of using bunch of 5V Compactor amplifiers (op-amps). One as master amplifier to boost the signal, and 16 more to isolate, amplify and output the data for the pixel strings. All op-amps to operate as non-inverting (data connected to +V). The negative leg of op-amps to have a reference voltage of 2.5V accomplished by a simple 10K voltage divider.
Here are the questions:
1- Will this work?
2- What op-amp do you suggest since I need 1Mhz switching and single source 5V? Can the master op-amp handle 16 outputs?
3- Since op-amps will share the supply voltage with 5V pixels, should I worry about the switching of pixels effecting the op-amp operation? Decoupling capacitor?
4- I am open to suggestion for any ideas specially the ones that are low cost!?
5- I have searched the net and could not find anything useful. Any source for additional info and ideas are very much welcomed.
Regards,
Rom