Help needed with wiring for university project

Other Hardware LEDs and Multiplexing
1

Hi everyone,

In a university project we are required to build a prototype based on our ideas and I got assigned the task to build the lighting part. I need a bit of help confirming the wiring for the project as I did not have a physics class in 4 years and everything about electronics I learnt in the last 2 days and I dont want to fry any component by messing something up. The circuit would consist of a 1m LED strip https://docs.m5stack.com/en/unit/rgb_led_strip and a LED matrix https://docs.m5stack.com/en/unit/neohex controlled by an arduino.

For connecting the LED strip I found a diagram online (picture 1).

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For connecting the LED matrix to the circuit in picture 1 I was planning to use a Grove to DuPont male converter. Then connect the data pin to a GPIO pin of the arduino with a 470 resistor, the VCC to the power source, then the ground to the power source's ground and leaving the last without connecting it to anything. Please let me know if this is correct.

Power:

According to the documentation the LED strip needs 18W/m and uses 5 V so the maximum current needed should be 3.6A. I was thinking of getting a 4A 5V DC Jack adapter and powering both light sources from it and using a powerbank for the arduino.

Can I just use jumper wires for the power or is 4A too much current for them to handle?

Please let me know if this setup is viable and if I took everything into account?

2

if you mean those DuPont jumper wires, they are typically rated for around 1A. No problem for the data connection, but to run a current of 4A from the power supply would require something a bit more substantial. Check the datasheet or reel label for the rating of the wire that you are using.

3

The matrix could use up to 1.1A so you might need up to 3.7+1.1 = 4.7A.
Give youself at least a 10% margin so a supply of at least 5.2A

4

Some power banks do not recognize the slight draw of a single Arduino therefore might not supply power. Many on-line "arduino" projects are bad to dangerous. Adafruit has created an extensive WS2812 Uberguide worth reading:

And DroneBotWorkShop is a good source for accurate information:

1 Like
5

Thank you for the insight.