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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DHT11 sensor works on Arduino Uno, not on LoLin NodeMcu
When run this code on an Arduino Uno (clone), everything works.
When I run it on my LoLin NodeMcu, I get the following verbose upload output:
esptool v0.4.9 - (c) 2014 Ch. Klippel <ck@atelier-...
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Get Battery voltage on raw
I power my Arduino Mini with 3 AA batteries on RAW input. Is it possible to get the voltage on RAW and therefore the expected longevity of the batteries?
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How do I hook up a 3V device to a 74AHCT125 (Quad Level-Shifter)?
I have this level shifter that I'm trying to feed a 5V power source and then hook up a 3V device.
I've got the 5V source hooked up fine (on the top pinouts), but having trouble figuring what the "...
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Gnd pins at the power pin strip VS Gnd pin at the IO pin strip
I noticed there are two Gnd pins at the lower pin strip, and another on the upper strip.
Is there a difference in their purpose?
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arduino pro mini analog pins read different values
i need to read a voltage with an arduino pro mini using the analog pins.
I created this simple test code:
int sensorValue;
float voltage;
void setup() {
Serial.begin(9600);
}
void loop() {
...
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5
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Supply 5V to Arduino
I am building a quadrocopter with an Arduino Uno as control unit. I know I can supply 5 volts to the 5V pin, but my ESCs produce 5.5 volts, which I measured with my multimeter. Will this voltage drop ...
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VLcd pin to ground?
I just bought an ERC12864-655 LCD screen.
On the datasheet it says that I need to connect the vlcd pin to GND.
However in this (page 8) datasheet it says that vlcd is the main power supply. As far ...
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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 ...
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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....
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How do I turn off a 12V 3A RGB LED strip?
I'm trying to understand how to control an RGB LED strip, I set up all the TIP120 (because I could get my hands on an n-channel mosfet), if I power everything in this way I can change colours and ...
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Analog read negative voltage inbuilt protection
I'm trying to read a -10 to +10V analog signal on my Arduino Mega (2560). I've been using a voltage divider to obtain a -5V to +5V signal (with two 10kOhm resistors), which used to work just fine.
I'...
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9V Vin powered Mega - 3V instead of 5V
I'm experiencing an issue with an Arduino Mega 2560 :
I powered the board through the Vin using a +24 --> 9V voltage regulator. When I power the board and measure the 5V output from the board, the ...
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Is it possible to power this 12V Wind Speed Sensor with a 5V battery?
I have a battery pack used to charge mobile phones. It's capacity is 13,000mAh and it has two output ports. Both are 5V but one is 1A and the other 2.1A
It also has an Input port of 5V 1A. (To which I ...
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Voltage increasing when charging a battery using arduino
I am making a solar charge controller using Arduino. So for starting, I thought I should calibrate the voltage so that I am able to read the exact voltage of battery and solar charger. For testing ...
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How to read Arduino voltage
I am trying to do voltage measurement using Arduino. I am using a voltage divider circuit to reduce the voltage to less than 5V. I measured the voltage on the 5V pin of Arduino and found out that its ...
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Using two references in the same ADMUX
I'm making a project and I neee to use 2 different references on the same ADMUX. One reference is 0-5V and the other is 0-2.5V. I'm aware that I can use the reference of the Arduino to the 5V sensor. ...
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digitalPin giving lower voltage than Vcc
I am using an ATTINY88 for a project that requires to turn on an LED. Right now I am using pin PA1(ADC7/PCINT25). I noted, however, that when the pin is ON, I get about half the voltage that is ...
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Can I convert 3.7V to 5V's using 3.3v to 5v converter
THe product: (https://www.sparkfun.com/products/12009)
So guys, here' s a pretty simple but important question for me:
Can I convert 3.7V (li-po battery's voltage level) to 5V's (I do have arduino ...
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How to increase voltage of Arduino?
Hey I'm very new to Arduino. I don't have very much knowledge in electrical engineering either.
My project: an EL wire working on Arduino. Since the Arduino can only support 5V and the wire needs ...
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How do you use an Arduino to control a 4 - 20 mA transmitter?
I am using an Arduino Mega to control the speed of an AC pump. This can be done by connecting to the variable frequency drive. Here is a link of the relevant datasheet, pages 66 and 67 relate to what ...
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Powering 3.3V Arduino and 12V peripherals from single 12V power supply?
Given:
I have some home alarm peripherals (motion detectors, glass break sensors) which operate at 12V and draw a nominal current of 20mA when in alarm state.
I have a Particle Photon (3.3V logic ...
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Understanding flow of current with pull-up and pull-down circuits
I am new to all of this and was trying to figure out what was happening with pull-up/pull-down circuits. I think I understand what happens when the board handles the pull-up/pull-down but I wanted to ...
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Power arduino from 5v rail of pc molex
I'm building a small device using arduino that should be connected to my pc via a usb header to exchange data with the PC.
What I'd like to achieve is that arduino turns on when the pc is on, whereas ...
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Do I need more voltage to close this circuit?
I'm hacking together a RF-controlled garage door opener. I'm tapping the "receiving" end in to the push button wires.
When the two wires touch, it toggles the garage door motor.
I'm trying to ...
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4
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Reduce 5v Trinket Pro to 3.3v?
Apparently these nRF24L01+ modules need 3.3v, but I've only got 5v Trinket Pros that I'm using.
How can I reduce the voltage to the RF transmitter?
Would a voltage regulator work? Specifically ...
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ATtiny85 (Sparfun Clone/Trinket), detect/read operation voltage
I just started with Arduino programming and currently I'm using this Sparkfun clone board:
o http://nl.aliexpress.com/item/Digispark-kickstarter-Micro-development-board-ATTINY85-module-for-Arduino-...
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Motor control using arduino board
I want to control 2 dc motors using the arduino board directly. One motor must rotate clockwise and the other counter clockwise. The directions doesn't change only the speed of each motors. Can this ...
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How to convert voltage to current from ACS712-20A?
I've been used the ACS712-20A to measure the current flow. Actually I used LIFA program (LabVIEW interface for Arduino).
I used this equation:
current = ((analog read)-2.5 )/ 0.1
But I am still not ...
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Voltage divider producing unexpected voltage
I'm trying to run a neopixel strip and an arduino from the same power supply using a voltage divider to get 5V to the strip.
Here are the values for my voltage divider:
R1 = 1500 Ω
R2 = 1000 Ω
Vin ...
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Arduino nano to esp8266 level shifting needed?
I want to connect an Esp8266 Wifi module to an Arduino nano. I am wondering if I need to implement level-shifting for the Arduino TX line to Esp RX line?
I find different schema's on the net. Some ...
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Do I need 3 voltage dividers to control ESP8266
I am buying an ESP8266 and the plan is to control it serially from an Arduino. I am going to use a voltage divider(Using a voltage divider is temporary and I know the cons of using voltage dividers).
...
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Erratic readings on Analogread with low voltages
I am using Arduino Uno for measuring sensor voltages. I am using multiplexer to switch between different sensors. The readings measured in the range of 800-900 mv are accurate, but at low millivolts (...
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Measure different Vcc using 1.1V bandgap
When I power my ATmega328P chip from 5.16V and 3.3V, there doesn't seem to be a single bandgap voltage compensation figure that works for both.
I'm using the following sketch, and I need the ...
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Confusion with ATmega328P and 3.3V/8MHz
Firstly, I have tried to set the bootloader to be 8MHz internal oscillator.
I have tried the board setup from here - https://github.com/oshlab/Breadboard-Arduino.
And also the breadboard-1-6-x.zip ...
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How to use voltage divider between ESP8266 (3.3v) and IR proximity sensor (5V)?
I am a software developer and I don't know much about circuits so I need help.
I have an ESP8266 (esp-12) 3.3V and I'm planning to use it with an IR proximity sensor (runs between 4.5-5V). I have 2 ...
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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 ...
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5V Trinket only outputting 3.3V?
Unless my multimeter is on the fritz, it would seem my 5V Adafruit Trinket is only outputting 3.3V when connected w/ DC power.
When connected via USB, totally fun. Full 5V. But if I disconnect that ...
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How to reduce current from a AC TO DC power supply for arduino use
I have a AC to DC converter that was originally used for recharging the PSP, I stripped the 2 wires of the output and was wanting to use it for my arduino instead of using a 9V battery, it's output is ...
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voltage output at digital pins vs. load
I am trying to convert the signal from digital pin 2 on my Uno to 3.3V. I set up a voltage divider with 3 x 1000 ohm resistors. When connected to ground and 5V the divider circuit generates 3.3V ...
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Funduino Uno with 5V 1A power supply?
Can I use a "Funduino Uno" arduino with power from a power bank with DC 5V 1A output?
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Is that correct that input and output pins are not supposed to have current through them?
Are input and output pins not supposed to have current through them and only either apply voltage or "measure" it?
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What minimal resistance should be between an input and output pin not to burn Arduino?
So, I'd like to put a button between input and output pins to read when button is pressed. What minimal resistance should I add to the scheme not to burn Arduino when the button is pressed? Does this ...
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Trinket works with USB but not with wall adapter
My Adafruit 5V Trinket works fine when powered via USB connected to my computer (and the power going in to the Trinket is 5V), but if I use a 9V wall adapter with a microUSB adapter, it just powers on ...
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What happens if I try to draw power from the VIN port while under USB power on an Uno?
I would like to have a shield permanently attached that use the VIN (not 5v) for it's power - the problem comes in when I want to program the arduino (via the USB port), do I need to also have the ...
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Two voltage sources on the same circuit
I am looking to power a Trinket Pro 5V microcontroller using a 9V voltage source. I have logic running on this controller to gather the data from an accelerometer (powered off of the 5V pin on the ...
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Problems with serial communication from Arduino to Bluetooth HC-05
I just purchased some HC-05 Bluetooth devices and I have followed the directions to put the devices in AT command mode by holding EN HIGH when the HC-05 powers up. When I do this the HC-05 goes into ...
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Arduino Mimicking Voltage Dividing Keypad / Matrix
Still very new to Arduino, so bare with me. I've been all over Google looking for ways to hack my alarm keypad. This is my first time using the Arduino to hack something :smiley-confuse:
The keypad ...
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Low-Pulse Occupancy and Voltage Divider
I have a PPD42NS dust sensor I'd like to hook up to an ESP8266-01 microcontroller. The ESP8266 uses 3.3v logic, but the PPD42NS uses 5v. The PPD42NS uses low pulse occupancy as output.
I'd like to ...
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SPI with a level converter in the other end of connection
I have an Arduino MEGA hooked up with a NRF24L01, and working nicely, talking with another Arduino Uno. It works as described, power supply to 3.3V, and SPI lines (MISO,MOSI,CLK) connected directly to ...
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Do I use 3,3V or 5V, when device supports both?
I have a general question regarding the power-supply of the electronic components, that are attached to an Arduino.
If I have a device that operates at voltages between 3,3V and 5V (e.g. this RS232 ...
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