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).

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Help needed with driving multiple stepper motors on arduino UNO

I am brand new to Arduino but have good experience with Raspberry Pi's and Microchips. My problem is that I am having trouble driving many stepper motors at once. I am using the AccelStepper library(...
KidWithComputer's user avatar
2 votes
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52 views

Voltage on open circuit jumping on Arduino R3

I am working with a bunch of sensors and everything is fine so far, but I figured on analog PINS 4 & 5 the output voltage read is 0.09V higher than on 0-3... for my Sensors this is a crucial issue....
AnyOneElse's user avatar
2 votes
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How to get power for a nexus 7 while reading serial data from an arduino over usb?

Does anyone know how to simultaneously power a Nexus 7 tablet while simultaneously reading serial data from an arduino over USB? I have had quite some trouble with this and have attempted multiple ...
Peace's user avatar
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Attiny88 problem with LEDs and voltage

I have the following problem and wonder if anyone may have some inside into what may be happening. I have an array of 20 leds that i manage to multiplex using the attiny88 using only 9 pins (4 ...
Camilo's user avatar
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How to splice into existing buttons?

I want to control a kettle. It has 4 buttons and a digital disply of the temp. I would like the buttons and disply to remain functional. I just want to make the buttons remoteky pressabke. The buttons ...
futurebird's user avatar
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226 views

Arduino based temperature sensing circuit

I've currently got a setup where I am using a 2 thermocouple setup using MAX31850 and the circuit looks exactly as mentioned here using the external power option. (https://learn.adafruit.com/adafruit-...
thirdattempt's user avatar
2 votes
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364 views

Connecting Indicator LEDs to Arduino Pro Mini

I'm new to electronics and unsure whether my design below will work as intended. XBee Series 2 and Arduino Pro Mini 5V are used. There are 4 LEDs, each with the following roles: LED1: Flicker when ...
Nyxynyx's user avatar
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1 vote
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I2C and logic shifter troubleshooting

I'm attempting to use a SparkFun bidirectional level shifter (Link here) to connect up a 3.3v wii nunchuk to a 5v Arduino Uno circuit. For now all I'm trying to do is write the position of the ...
ThorsHammer171's user avatar
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108 views

Using a level converter to adjust the voltage levels

we are currently working on a device that needs us to connect an sd card reader to 2 Arduino’s ( Uno and zero) , however, we just found that it is not possible to do so without a level converter , may ...
Alya's user avatar
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MQ-4 Sensor working fine with Beetle Bluno BLE but not with Arduino Nano 33 BLE

I have an MQ-4 sensor connected to a Beetle Bluno BLE that seems to work fine, however, when I change the board to an Arduino Nano 33 BLE, the sensor doesn't seem to work well (I get an arbitrary ...
human's user avatar
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Motors would make the car go extreme left instead of forward (Self Driving car)

This is my very first day in the community, please bear me until I make myself comfortable here. Coming to my question, I'm making a self Driving car. My car instead of moving forward it moves on the ...
Rahul Macwan's user avatar
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28 views

Voltage to keep my board safe

I have recently made a home automation system using node mcu and relay module and i am powering both together using my 5V ,2A dc adapter and i am scared that if I'll keep using it for very long hours ...
Atom Warex's user avatar
1 vote
0 answers
52 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 ...
Jethro's user avatar
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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 ...
Ross Hanna's user avatar
1 vote
0 answers
436 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 ...
godlygeek's user avatar
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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 ...
jirinovo's user avatar
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Arduino Uno RFID-RC522 won't scan any card or tag

So I bought a RFID-RC522 module with a blue tag and a white card, and I searched for tutorials and found this library that I used it. and here is my code : #include <MFRC522.h> #include <SPI....
Mr Code Gamer's user avatar
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1 answer
321 views

ESP32 struggling to trigger relay module consistently

I'm working with a 4-channel, 5 V relay module and an ESP32 which operates on 3.3 V. The setup seemed to work well initially but I have started experiencing some inconsistencies. One of the four ...
Hach Rbh's user avatar
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channels on logic level shifter outputs high

so I have a logic level shifter which is TXS0108E ,I use it to shift the eps32 ouput volatge to 5v to be used with motor driver ,when I test it with multimeter , all the channels on the B side outputs ...
kamal MKA's user avatar
0 votes
1 answer
56 views

Measure voltage of data output?

I'm trying to control a few NeoPixels using a 3.3V Particle Photon. I've got a 5V power source that I'm using to power the NeoPixels (as they require that voltage. That works fine. Them I'm using a ...
Shpigford's user avatar
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-1 votes
1 answer
137 views

Can the Arduino Uno use a negative supply voltage (0V & -5V)

I acquired a bread-making machine. See control board image. I want to use the machine for other purposes and control the buttons, paddle, heater & 7-segment display with an Uno. As it stands, the ...
Mick's user avatar
  • 9
-1 votes
1 answer
509 views

What is LCD bias voltage and where do I have to connect it?

I noticed that I have VB0+, VB0-, VB1+ and VB1- pins on my LCD. In the datasheet it says they are for the "LCD Bias Voltage". I have never heard about that. So what is it? Where do I have to connect ...
crolex's user avatar
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