2020年5月2日 · I'm planning on controlling a 5m 60 LED/m WS2812B chip 5V strip with a Raspberry Pi Zero W. According to the website it draws 18 watts per meter (90 watts total). What current would this strip draw, and what would you recommend on powering both the Pi and the strip from one PSU? Any link to some decent, budget ones would be appreciated.

2017年1月12日 · NEVER EVER connect a LED directly to a supply unless it is specifically designed for that. Almost all common LEDs are not. ALWAYS use a series resistor. If you make 20 mA flow at 13 V then at 5 V the LED will still work but at a lower brightness.

2018年5月24日 · Another option is to not use a LED to make the visible light. LEBs (light emitting bulbs) intended to work from a single 1.5 V battery were commonly available for "pen lights" and the like. However, the efficiency will be poor, even compared to relatively bad boost converters and charge pumps driving a LED.

2017年11月21日 · You may want to get a more powerful 5 volt power supply. Alternatively, you could measure the resistance across the string of lights. $$\frac{5V \times R_{lights}}{7V} = R$$ If you connected a resistor in series with the lights that had a value of R, you could simply hook it right up to the 12 volt battery.

2019年7月31日 · I am working on a LED project involving 5V led strips. I did some calculations using the WS2812B led strips and found that I need ~100W. I took the cheapest power supply available where I live but it delivers 12-24V. Is it possible to arrange the LED strips in a way that the voltage would add up to the output of my power supply?

2014年11月30日 · The first is an IC such as the QX5251. This is a solar battery charger and LED driver in a TO-94 package. It rectifies the solar input as well as detects when it is dark in order to activate the LED. The second is an inductor which the driver uses to boost the voltage from the battery high enough to light the LED.

2017年11月18日 · The reason to use a 5 V supply is to limit the reverse voltage across the LED when connected backwards. Most LEDs can stand at least 5 V reverse across them. A visible-light LED will drop a minimum of 1.8 V. That leaves (5 V)-(1.8 V) = 3.2 V across the resistor. Just about any LED can handle 20 mA forward current. By Ohm's law, (3.2 V)/(20 mA ...

First, do the math. If each LED requires 1.5 V (that sounds low unless they are red), and you have 16-20 of them in series, then the total string will require 1.5V*16 = 24V to 1.5V*20 = 30V to light. So no, a 12 volt battery isn't going to do anything useful. Second, there is no such thing as amount of electricity. At best that is ambiguous ...

2016年3月30日 · According to the WS2812 datasheet (I can't find a WS2812B datasheet and you didn't provide a link) the integrated LED chip and controllers run on a supply voltage of 6 to 7 V and a current of 20 mA per R, G and B LED. Total all-on power demand given by \$ P = VI \$ will be \$ 2000 \cdot 3 \cdot 6 \cdot 0.02 = 720 W \$.

2020年11月16日 · An AA battery has a nominal voltage of 1.5V which varies from 1.1 to 1.5 depending upon how much the battery has been discharged. Most LEDs require 2.5 - 3.5V minimum to turn on. Reds LED turning on at the lower voltages while Blue LEDs require higher voltages. Two AA batteries in series can light up an LED since they together supply about 3V.