Fun fact for anyone passing by: the atmega328p shown here can actually operate down to 1.8V, but the Arduino boards typically use 5V or 3.3V as a design choice. Lots of possibilities open up if all your parts and the microcontroller can run directly from a couple of AA batteries (2-3V)!

What’s the best way to learn how to do all these electrical wiring

@MMuraseofSandvich

2 жыл бұрын

For me personally, I learned the most when I was building something. It can be as simple as hooking up a button and an LED to an Arduino with a breadboard and some wire. This way, the only tools you need is a cheap PC with a USB cable.

@BrownMInc

Жыл бұрын

Bump

What difference does it make compared to a voltage divider?

@mechamicro

2 жыл бұрын

Same here, i just wonder that I can use that too. I guess is the noise.

@MMuraseofSandvich

2 жыл бұрын

With a voltage divider, you can only go down in voltage. With many level shifters, you can go up in voltage as well as down. This can be important as some microcontrollers like ESPs run on 3.3 volts rather than 5. If you only need to communicate with an output device running on 3.3V, a voltage divider will work fine as long as you're not drawing a ton of current (the Uno should accept 3.3V signals). Otherwise, hook up a level shifter.

I2C can bridge 3.3V and 5V chips easily. Since I2C uses open drain, just pull up to 3.3V and you're fine, no logic level shifter needed.

@shantanuyadav6135

2 жыл бұрын

What should I use while interfacing Arduino Uno Atmega328p with LoRa module to be exact RMF95W, it a 3.3v module and uses SPI communication should I use voltage level shifter or would it be slow for transmission??

@CrimsonTide001

2 жыл бұрын

@@shantanuyadav6135 SPI is not open drain (you're not sourcing your current externally to the chip) so you'll need a logic level shifter for SPI.

@shantanuyadav6135

2 жыл бұрын

Thank you very much for the answer!!

So, what sort of level shifter would you use for NeoPixels? I'm constantly running into issues driving NeoPixel strips that want 5V with various Adafruit microcontrollers that only output 3.3V (I've settled on the ItsyBitsy M0 because it has one 5V output pin, but sometimes I need more than 1).

@cardboardboxification

2 жыл бұрын

use a optocuppler , connect optocuppler to a transistor that can supply the voltage and current needed , use resistors to adjust current if needed ... here is a circuit i made to change my dads slot machine from 120 burnt out lights and triacs to leds and transistors . i modified a arduino relay board for it , 5v computer side 12v led side yours will need parts that can handle the communication speed , i never messed with the new pixels . optocupplers keep 3.3v and 5v isolated from each other maybe explain what problem you are having and someone might already have a solution kzread.info/dash/bejne/nX6Ot9qFZsnAhc4.html

@maxxiang8746

2 жыл бұрын

late by eight months but if you still care, maybe try using two 74HCT14 inverters, since neopixels use one way signals and the hex inverter can do with 2.1v inputs when running on 5v

So this logic level shifter is a voltage reducer?

@Codebyakshay

6 ай бұрын

No it shift voltage/logic signals live 3.3 to 5 V