Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [voltage-level]

Voltage level should be used for questions that are referring to using hardware together that operates on different voltages (the "concentration" of electricity).

0
votes
0answers
12 views

Adapt 3.3v Qwiic device to Arduino running at 5V [on hold]

I just bought an I2C keypad from SparkFun for use in a Arduino project I'm working on. I'm already pretty far along, and committed to using the Arduino at 5V. It turns out the keyboard, an SKX-14836, ...
0
votes
0answers
32 views

Checking Arduino 5/3.3V under load

Is there a way to use common/cheap components to put the 3.3V and 5V pins on an Arduino under load, in order to measure if they are giving a correct and stable voltage? Can I calculate a certain load ...
0
votes
0answers
30 views

5V MCP2515 to 3.3V Teensy. How to reduce the MISO voltage

So to try and speed up my project, I have moved from using two UNO's to a UNO on the receive side, and teensy 3.6 on the sender side. However, no dice. The UNO doesn't receive any data or even try to ...
0
votes
2answers
40 views

threshold voltage level and blinking problem

I am using arduino pro mini 3.3 V,8 Mhz.vcc of the this arduino is coming from AC-DC converter with regulator 3.3 volt.I am listening analog data from voltage divider approximately 250 milivolts. I ...
0
votes
1answer
25 views

How to build an µC controlled power regulator?

The idea: Use an Arduino-like µC to control a set of CPU fans by control the voltage the CPU fans receive. My question: How can I do this in an easy way? Yes, I know, there is PWM but this is not ...
2
votes
1answer
186 views

How can I tell the resistance of an internal pull-up resistor?

I have a SparkFun ESP8266 Thing Dev board, to which I want to perform a digitalRead() on one of the GPIO ports. I'm using D15, and I'm configuring it for input like this pinMode(15, INPUT_PULLUP); ...
0
votes
1answer
28 views

3V Arduino options

I have an Arduino Mega board to test 3V devices. Which is the simplest way to connect those 3V devices to the Arduino Mega (it works at 5V) without burning them? I saw the Adafruit Trinket works at 3V,...
1
vote
2answers
51 views

How would I go about measuring an analog signal on my arduino mega that has both positive and negative voltages

I have a signal that fluctuates between -70mV and 50mV. How would I get the arduino to read this.. Ultimately I am trying to graph the data in real time so it looks like this. https://imgur.com/a/...
-1
votes
2answers
41 views

Fluctuating voltage coming out of arduino uno 3.3 output pin [closed]

Problem with my arduino is when I check voltage of 3.3 volt pin using multimeter , voltage varries a lot from 1.5v upto 5v. Due to which esp8266 wifi module connected to this 3.3v pin gets very hot. ...
0
votes
1answer
55 views

Waveshare 1.54 inch ePaper display requires 5Vs from Arduino Uno

I have an Arduino Uno and I would like to attach a Waveshare 1.54“ display (red, black & white) to it. All the specs tell me that it consumes 3.3 V which I have readily available on the Arduino ...
0
votes
1answer
131 views

Arduino YUN Rev. 2 power supply

I want to connect my YUN Rev. 2 to 7.4V. I read that the older version only provides exactly 5 V at the Vin Pin. Is the Rev. 2 similar to it? I read that the power supply should be improved, but what ...
0
votes
1answer
59 views

The need to use logic level converter

Why do we need level logic converter to have 5V or 3.3V? Because in Arduino Uno/Mega (don't know about other boards), they already provide 5V and 3.3V for us to use.
0
votes
0answers
49 views

Seemingly free floating and too high voltages

I have connected a moisture sensor, a usual LDR, a BH1750 and 4 DS18B20 sensors to my Adruino MKR GSM 1400. A few days ago everything worked fine when mounting it to a breadboard. But now for some ...
0
votes
1answer
194 views

Read frequency of input in digital pins

This is a somewhat theoretical question: Let's say I have some sensor that sends digital signals to one of Arduino's digital ports. Now, I don't know the frequency it sends those signals in. For ...
0
votes
1answer
309 views

YL-38 output to NodeMCU v1.0 analog input

Using a YL-38 and NodeMCU v1.0 I am trying to achieve what the first link is doing, take a soil moisture reading. I've done this on an arduino, but the conversion from an arduino nano to a nodemcu is ...
0
votes
3answers
44 views

nrf24l01 fried when supplying 6.5V to VIN?

I have two Arduino Unos (One clone, one genuine) and I'm trying to make a remote and a base station. Got everything working flawlessly, (Using RF24 library) and the last piece of the wiring was to get ...
3
votes
1answer
530 views

How can I create a battery level circuit

Im trying to create a circuit so that I can monitor the voltage drop on my battery and send an message when the voltage drop reaches the drop out. But I'm having some problems with my voltage ...
0
votes
2answers
70 views

3.3V from 5.0v outlet

I am working with an Adafruit Feather 32u4 FONA board. I want to connect a GPS module I have worked with before (3.3V required) but am not having much luck. I have studied the pinout of the board and ...
2
votes
2answers
38 views

Input voltage from circuit drops despite Arduino turned off

I'm using an Arduino Uno to emulate an old Atari disk drive as described here: http://whizzosoftware.com/sio2arduino/ As both the Atari and the Arduino use 5V TTL serial communication, the hardware ...
0
votes
2answers
42 views

How much low analog voltage can Arduino uno read?

Today I was playing around with arduino analog voltage ranges, the error in output with respect to a digital multimeter started to happen when the reading was around 0.0014volts. How much low an ...
-1
votes
1answer
64 views

How to change the value within a variable using math? [closed]

I'm up to Lesson 11 in the TopTechBoy tutorial: https://www.youtube.com/watch?v=afurKLOqqSg Lesson 11 : http://www.toptechboy.com/arduino/lesson-11-arduino-circuit-to-dim-led-with-potentiometer/ I ...
0
votes
1answer
66 views

Capacitors, Arduinos and Saving Data

In short, I have programmed and wired a speed/odometer and all is working well. However, I need to save data from the components/sensors once a power button is pressed, which has led me down the road ...
1
vote
1answer
98 views

Teensy 2.0 with MCP23017-E

I've recently bought two more MCP23017-E's for a project, but after hooking them up to my Teensy 2.0 I couldn't get them to react to anything. Suspecting faulty hardware, I hooked them up to an old ...
0
votes
1answer
34 views

3.3v Arduino I2C communication with motor controller powered at ~6v

I am trying to just use the voltage from 4 Alkaline AA batteries in series (6v nominal) to power a motor with the TI drv8830 IC. My question is, will this circuit (specifically just pulling the sda ...
2
votes
1answer
420 views

Two batteries sharing ground?

I need to power my arduino and 2 DC motors requiring 6V each, I want to power the DC motors with a 6V battery through the vM pin on an h-bridge and use a 9V battery to power the Arduino itself. On my ...
1
vote
2answers
886 views

How to measure the supply voltage of Arduino without using an analog pin

I'm using Arduino Nano to measure temperature with a 10 kohm thermistor and a voltage divider. My problem is I'm getting only 4.2V on the 5V pin. The power is supplied via a USB cable from a desktop ...
1
vote
1answer
53 views

powering arduino with a voltage divider to increase lifespan

I have a chinese arduino nano that I'm planning to use to open a door using a numeric keypad. My power source is 12V and I want it running 24/7. I have read that the first thing to fail on an arduino ...
3
votes
2answers
1k views

Getting 3.3v on 5v pin in Arduino Uno

When interfacing my Arduino Uno with a relay I was facing reliability issues, and while investigating it with a multimeter, I found something strange. I noticed that in the 5V power pin (with which I ...
2
votes
0answers
205 views

NPN transistors level shifter [closed]

I'm going to use this for Arduino Pro Mini (5v version) to communicate with ESP32 via UART so I need level shifting. I found this circuit which uses NPN transistor and I'm also going to use it. This ...
1
vote
1answer
264 views

Getting the voltage of an 18650 battery with an Arduino

I'm using a Arduino Pro Mini (5v) to sense the voltage of an 18650 battery. The battery (that is being sensed)is also used to power the Pro Mini but the MCU is behind a boost-converter which outputs 5....
0
votes
1answer
465 views

Electric meter pulse counting using LLC

I am trying to create an electric meter reading setup for Arduino, and I have been searching for it and almost every posts available is using LDR sensor. http://www.reuk.co.uk/wordpress/solar/...
0
votes
0answers
233 views

Serial communication between two microcontrollers w/ separate power supplies

Fair warning: I'm an electronics n00b. I'm trying to get an Arduino Uno R3 to send data over 9600 baud serial to a Wemos D1 Mini Pro. What worked (mostly): Powering (5V) Arduino off a 4 AA barrel ...
0
votes
1answer
93 views

Why is there a third connection to the host in this 3 wire current output sensor diagram?

I've got a 3 wire 4-20mA current output sensor, externally powered by 12V, which I want to read from an Arduino Uno (5V). The sensor connection diagram is below, but I don't understand why it says to ...
1
vote
2answers
116 views

3.3V Conversion [closed]

I'm writing a SPI Master module for my FPGA and I would like test it with my Arduino Uno. What's the problem? My FPGA has 3.3V logic and Arduino has 5V TTL logic. So, what's the simplest solution to ...
2
votes
2answers
408 views

Does the Arduino Yun have to be powered exactly at 5V?

I'm working on a senior project and I am using a ATX PSU to supply power to the Arduino Yun and other components. If I'm not mistaken, its powered through the usb. I took a usb cord, strip the sheath ...
1
vote
2answers
171 views

Multiple LED on arduino [closed]

I am currently trying to control multiple LEDs with one Arduino Mega 2560 board. However, since each LED needs 3.6 volts and the board only supplies 5V I cannot make more than one light up. Is there ...
2
votes
1answer
300 views

This logic level converter does not want to work

I got this logic level converter to be able to use my lcd but I can't figure out how to get it to work, the problem is that the current is not passing through. This is the model: TXS0108E Any help is ...
0
votes
2answers
57 views

Arduino Voltage Divider

So am doing a project which involves the reading of voltage and current generated by Solar Panel. Now I learnt that Arduino cant Read Voltage directly above 5V. To read above that you need to add a ...
0
votes
3answers
282 views

What options do I have to get 5v on my current project?

I'm very new to arduino and have started work on my first project, a simple little web server. I'm using a NodeMCU with an sd card module and screen. The issue is that in order to power my sd card ...
2
votes
1answer
119 views

How to switch a low-voltage (1.5V) toy motor with an arduino?

I would like to add an Arduino to control a toy with a 1.5V battery and motor in it. The toy is currently controlled by a SPST switch in series with a single 1.5V AA battery and a cheap motor. I ...
0
votes
0answers
466 views

Using 5V microphone module with Wemos D1 Mini Pro 3.3V analog pin

I want to read values from this microphone module using Wemos D1 Mini Pro analog pin. Unfortunately, this module operates on 5V, but the analog pin on Wemos has range 0-3.3V. I have tried to use a ...
0
votes
1answer
932 views

Connect optocoupler 4N35 to Arduino Uno to control LED light strips

I want to use an Arduino Uno to control the LED light strips, based on the input signal from a robot controller. The robot controller sends a digital signal with "HIGH" of 24 V and "LOW" of 0 V. I ...
0
votes
2answers
190 views

5v input on ATmega328p running on 3.3v

The ATmega328p can run on 5v but will it cause problems if it runs on 3.3 v and one input signal is 5v?
-1
votes
3answers
48 views

Which voltage should I use with a component that allows between 3v and 5.5v? [closed]

I have a DS18B20 temperature sensor that needs between 3v and 5.5v to work, as seen in its documentation. What's the difference? Should it work better which 5.5v? I know that a LED with more voltage ...
-1
votes
2answers
53 views

Can I change Vcc to some other pin?

I was working on an Arduino Uno and while carrying it to my teacher the wire's pin got stuck into the Vcc of 5 V. Can I set Vcc to other inputs? If so, then how?
0
votes
2answers
3k views

Can I use a 3.3v GPIO to control an opto-isolated 5v relay board?

I am working on a DIY home automation project using a Wemos D1 Mini as the controller, and I ordered some 4-channel 5v-triggered relay boards. The ESP8266 that Wemos D1 Mini's are built on has GPIO ...
0
votes
0answers
165 views

Use of a logic level converter with Arduino Due PWM

Maybe I am way over my head here, but here it is: I am trying to regulate a spindle RPM. The tachymeter part is now working flawlessly. Now I am on the PID part, to control and regulate that speed. ...
1
vote
1answer
22 views

Is it right to connect Serial module directly? [duplicate]

I find a strange thing that the led is on when power is off. And it's the problem of my serial module. Arduino may get power from my serial module. My serial module use max2322. I don't if it will ...
0
votes
2answers
503 views

Fast switching of high load using an IGBT [closed]

I want to control a high load with fast switching times (motorbike ignition coil) using an arduino. I found an IGBT that claims to be purpose built for that use case (ISL9V3040P3). This IGBT has an ...
0
votes
1answer
82 views

Non intrusive current sensor with unreliable (strange) readings

I have a project where I will mount 6 non intrusive current sensor model SCT013 (100A/50mA) manufactured by yhdc.com on an Arduino Mega. Virtual ground and Burden resistors are 1% tolerance. To ...