Questions tagged [voltage]

Voltage is the difference in electric potential between two points of an electric circuit, measured in Volts (V). Voltage can be constant (DC) or varying (AC).

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51 views

Using a DFRobot Voltage Divider

I'm reading on the DFRobot website to implement this Voltage divider: Analog Voltage Divider SKU: DFR0051 void setup() { Serial.begin(9600); } void loop() { float val; float temp; ...
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215 views

Why does reading an analog pin give a different results when interfacing with Processing?

I am interested in measuring the voltage over an analog pin (A6). When I use the Arduino IDE to print the results through the serial I get values around 300. Here's the code void setup(){ Serial....
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739 views

Will Nodemcu support 4AAA

Will Nodemcu support 4AAA batteries which is 6v approx, or should i go with 3AAA batteries which is 4.5V approx. And one more question , is it ok to use AA instead of AAA ?
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737 views

Arduino Nano off 9V : is there any change to output?

I'm building a test circuit on an Arduino Nano that consists of a simple 220 Ohm resistor and an LED on pin D2 which is routed back to GND (ground). It's as simple as this: It's running a very ...
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2answers
129 views

Need Input: Wait for voltage input to begin script & when voltage maintains 0V for X amount of time Reset and wait for Voltage Input

So I'm currently working on an automotive set up. I'm using a 555 timer to emulate a turn-signal alternating voltage pulse (12V to 0V and repeat) for debugging purposes which is output to turnPin/A1. ...
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131 views

HC-05 3.3 voltage regulation

HC-05 Bluetooth RX requires 3.3 v (TX has a regulator built in) I understand my uno and nano are 5v Ive connected a 3.3v Zennor in series with a led and resistor and with multimeter established the ...
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665 views

PC Fan Speed Control [closed]

I am working on a project to blow air gently through a number of pipes and variable speed. I would like to use a standard PC case fan and have control of whether the fans are on/off and also what ...
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2answers
33 views

Batteries and amps in parralel [closed]

So, i am about to buy a brushless motor a ESC and a 18650 batteries for my arduino. The batteries "specs" is 3.7v and 20a, if i would to put 2 and more in parallel would i get 7.4v 20a or 7.4v 40a? ...
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1answer
287 views

NodeMCU ESP12 Voltage

I'd like to power an NodeMCU off of four 1.5v batteries. That's 6v. Depending on the source I've read that 5.1v will fry the board and, just a few clicks later, that the board will take up to a 20v ...
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2answers
125 views

Controlling voltage and current from chip?

I'm well aware that this question perfectly showcases my spectacular ignorance, but oh well. It's a simple enough question, so here we go. I have a 595 chip (SN74HC595) wired up to an Arduino, fed by ...
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4answers
8k views

Reading pressure sensor using Arduino analog

I'm using a Arduino Uno to read pressure and I want to know if I have wired/coded the sensor correctly. I'm not sure I'm getting the correct readings (it could be the right readings - I just want to ...
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2answers
248 views

Max current per pin is 40 mA. But it is always 40 mA?

I need to calculate resistor for a PNP transistor. To do this I need to know the voltage and current. I know voltage is 5 volts as it is easy to find in the internet, but how about current? I mean ...
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1answer
52 views

Designing around Output pin limitations

I'm new to Arduino and am working on a project with my son. We are using the LillyPad USB board (schematic) to drive a bunch of LEDs (LED Datasheet). Our project is based loosely off of the 'Turn ...
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3answers
3k views

Combining code for multiple sensors (Current and Voltage Sensors) in one program

I need to operate 2 different sensors (Current and Voltage) simultaneously. I have managed to run each one of them separately and I don't know how to manipulate the code so they could work together. ...
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1answer
188 views

How can I make an AC analog voltage with Arduino?

I am trying to create an AC voltage in Arduino. Until now I have only managed to get a square wave. How can this be achieved with Arduino? If I try: int up; int down; int out = 11; void setup() { ...
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1answer
1k views

CH340 3.3v stability

I want to use the 3.3v on a cheap Arduino Nano clone as my ADC analog reference voltage. The 3.3v comes from a regulator inside the CH340 USB serial chip. I've measured the voltages (My DMM is NOT ...
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2answers
159 views

Smart way to map digital pins to a for loop over analogue pins

First post here and I have very little Arduino/c programming knowledge so forgive me my ignorance. I am processing 18650 cells for a little powerwall project. I am using an Arduino pro mini ...
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4answers
135 views

Automotive Lighting Control Module

I am looking for an Arduino-based solution for an automotive lighting application. System Requirements: Able to Operate in Automotive (Interior) Environment (12 +/- 2V DC Voltage) Minimum 3 12 V ...
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2answers
2k views

Power Arduino with 12V while using Serial Communication over USB

I'm going to build a 8x8x8 Led RGB Cube, therefore I will need a lot of Power which the arduino can't handle, so I'm using a 12V 20A (I know 20A isn't necessary but I had one laying around). So the ...
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2answers
2k views

How does Arduino digital input pin measure its input voltage?

Just starting with my first Arduino project. In order to measure voltage in a circuit I connected my multimeter to two points in the circuit (for example before and after a resistor). I am interested ...
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0answers
72 views

ADC pin shutting off on its own under certain condition

A0 pin not working when full PV system in use I am using the DFRobot Leonardo with Xbee R3. I am using the A0 pin to read a 0-5V voltage from my voltage sensor, which samples and steps down 130VDC ...
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2answers
2k views

Powering a DC motor with an external battery

I'm working on a project where i need to control a 6 volt motor with an Arduino. The motor that I'm using requires 6 volts so I'm using a 9 volt with a voltage divider to get those 6 volts. My problem ...
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151 views

Why is my Analog Input channel adding voltage to my signal?

EDIT: Here are the links to the sensor spec sheet (http://www.omega.com/temperature/pdf/HX71.pdf) and manual (http://www.omega.com/Manuals/manualpdf/M4543.pdf) for your reference. I'm using a ...
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1answer
682 views

How to understand the “power economy” of a voltage up-converter (boost converter)?

My online video Arduino instructor makes use of various devices to amplify signals, currents, and voltages. This seems like magic to me. For instance, he has 4 AA batteries with 1.2V each. He says "...
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1answer
568 views

How to create a smooth change in voltage?

We are given two voltages A and B between 0 and 5V. So how do I generate a smooth/continuous analog change in voltage from A to B in a predefined time? The current with that varying voltage is 1 ma ...
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2answers
892 views

Ams1117 worked fine on battery, up in smoke with 12v power supply [closed]

I have a circuit that worked fine on a a 12v lead acid battery for a day. Once connected to a 12v 3a power supply it didn't work properly and then the ams1117 5v burned up and so did a 3.3v one within ...
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2answers
354 views

I have cooked 3 regulators applying 12 V to RAW pin. Am I doing something wrong or did I get a bad batch?

I'm trying to make a simple keypad lock that has a 12 V magnetic lock. I supplied 12 V to the RAW pin on the Pro Mini with plans to actuate the relay with the 5 V from VCC pin. The lock was grounded ...
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3answers
2k views

PWM water pump flow control - in percent

I want to control flow level on 12V water pump with PWM pin, I'm using IRF520N MOSFET for that (and dedicated 12V power supply). I'm assuming, that setting PWM to full byte should give me about 100% ...
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0answers
15 views

Attempted to disable autoreset - now the voltage regulator only outputs 4.0v

I followed the guide from the Arduino website, by placing a 10uF capacitor between GND and Reset. However, now the voltage regulator only provides 4v (Vin=13V). It correctly has 5V when being powered ...
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1answer
944 views

Understanding schematics: resistors attached to Attiny85 pins V-USB

I'm currently trying to create my own Attiny85 usb thumb(to mimic an joystick). I understand that I have to limit the voltage on the attiny's pins that are connected to the D+/- pins from the usb. In ...
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4k views

How to know positive and negative in breadboard

I have this breadboard, and there is no indication on it about what is positive/negative on it. In comparison, this other breadboard (pic from the internet) DOES have indications: Can anyone give ...
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1answer
531 views

Using voltage divider to read voltage from sensor

Good morning, I would like to use an Arduino Duemilanove to read the voltage signal generated from a current sensor (CSLA2CD). The datasheet for this sensor can be found here. The problem is that ...
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1answer
474 views

Measuring voltage from -12 to +12 VDC

I'm making a -12 to +12V DC regulated power supply, on which I want to measure voltage and current with Arduino (through a voltage divider, of course). I'm not sure, how to either detect nor measure ...
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1answer
105 views

Multiplying the voltage output

I'm working on a project where my arduino is receiving a voltage 0-5V, I need the output to be 10V always. Is there a way to do that?
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1answer
226 views

HC-06 RX pin usefulness

I have a HC-06 bluetooth module. The module has an RX and TX pin (the RX pin receives data and TX transmits data) which connect to the TX and RX pin of an Arduino respectively (in my case an Arduino ...
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1answer
975 views

Logic level converter not working?

I'm trying to connect a 3.3v depth sensor to an Arduino uno. The logic level converter does not seem to send any current over (the sensor does not work and the voltmeter reads nothing). I tested the ...
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1answer
618 views

Connecting ACS 712 30A to my Solar Panel with Arduino

I am trying to connect my Solar Panel (array of 2 x 265Wp 24v panels connected in series) to my Arduino UNO R3/Nano so that I can make a current/voltage measurement system that can be connected to the ...
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1answer
451 views

Too low voltage on digital input on attiny45

I'm using one of my attiny's pins as digital input. I use it with a pulldown resistor. As input I use simple square wave generated by a separate waveform generator. igh state for square wave is 5V, ...

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