According to Paul Stoffregen’s Articles on December 6, 2017December 7, 2017, we know the APA102 LEDs strips have the problem at 24 MHz, usually after 150 to 250 LEDs.
But why? Here’s his attempt to investigate:One tempting explanation is signal quality problems due to horribly messy unterminated [...]
Pixel Protocol Overview: WS2815 This pixel protocol was designed by Newstar in China. WS2815 offers many of the benefits the WS28xx series is famous for. It uses 12V as its main power input for each chip, VDD, which is then dropped down to 5V inside [...]
hd107s 144leds led strip for special device
Pixel Protocol Overview: APA107
This pixel protocol was designed by Newstar LED in China, who use the 107 chip by Newstar. Very similar to the APA range, APA107 boasts everything APA102 brings, with 9Khz PWM rate and brighter LEDs. The control circuit and LEDs are integrated in [...]
Do you know the difference of APA102, APA107,HD107s and SK9822?
APA102: 20+ kHz PWM.
APA107: 9 kHz PWM.
HD107s: 26+ kHz PWM (the upgrade of APA107).
SK9822: 4.7 kHz PWM.
Newstar study the APA107/HD107S based on APA102 technology, so APA107 and HD107S is same protocol with APA102, same pcb/same [...]
Pixel Protocol Overview: WS2818 This pixel protocol was designed by Newstar in China. WS2818 offers many of the benefits the WS28xx series is famous for, as well as being the first in the series to support an output voltage of up to 24V, making it [...]
Pixel Protocol Overview: APA102 This pixel protocol was designed by Taiwan company. APA102 is one of the most common protocols for pixel lighting displays. The control circuit and LEDs are integrated in a 5050 SMD package, which provides a small physical footprint for each pixel. [...]
Below is one real tested for 144leds HD107S and 144LEDs APA102. You can see obviously voltage drop for APA102 after 30leds, after 0.5m no signal and all leds turn red. for hd107s, only the end has a little voltage drop. also HD107S is brightness [...]
For different application, we discussed the Gamma curve of IC chips on digital pixel LED tapes. Considering on the IC chip is sheer volume in the variety, so we collating the various parameter values like Gamma curve of value and other parameters of these [...]
Why need to add Power Injection for the addressable LED Strip? When we offer the power to the led strips, you always can see the brightness is dimmer than the leds near to the power supply when the led strips are more than 3m length, [...]