10 output devices

Jakob Lerch

Measuring the LED Matrix' Maximum Power Consumption

For measuring the power, the Rigol multimeter was connected for current measurement and the multimeter was measuring voltage. The ESP32 was programmed to run all LEDs on full brightness. This yielded a current and a voltage value from which the power was calculated. \[ P = U \ I = 4.87\text{V} \cdot 132.7\text{mA} \approx 0.65\text{W}. \]

Niclas Starost

For the Power Consumption I measured the current of one WS2812B LED to calculate, how much Ampere would run on my board below. There I limited the current to 100mA and set the Voltage to 3.3V which I wanted to operate them with in my board below.

There I measured:

0.02A @ 3.3V

for one LED with color white.

I wanted to build 12 of those LEDs in my board and I wanted to use 2 of the Super Capacitors to power the board, here the energy and time calculation:

2x Super Conductors
each:
    - 10F
    - 3.8V

12x WS2812B
each:
    - 0.02A
    - 3.3V

Q = C * V = 10F * 3.8V
=> 38C == 38 As

For 1 LED:

2 * 38 As / 0.02A = 3800s == ca. 63min (-> a small pomodoro cycle :D)

For 12 LEDs:

2 * 38As / (12 * 0.02A) = 317s == ca. 5min

Also note that this is with full Brightness and white color, meaning if I change to another color and decrease the brightness, I should get more time :].