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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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Voltage sensor Calibration

We had used a voltage sensor unit to measure the voltage of the odroid board using an Arduino Uno. wWhen I uploaded the sketch and got the output, the value which was being displayed was around 4.7 to ...
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79 views

Detect power interruption on NodeMCU

Im using a 5v 1A power supply and connected to VIN pin on the NodeMCU. I also use 18650 battery to keep NodeMCU running in case the power supply shuts off due to power interruption. I'm planning to ...
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161 views

Connecting 5V arduino logic with 12V car logic

I need to connect arduino to K-Line in my car's OBDII port. I used an L7805 to power the atmega but how can I interface 12V car logic with 5V arduino logic? The problem is, the connection has to be ...
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Have I fried the voltage input on my Arduino Nano?

I tried using my Arduino Nano in a circuit, switched on power to the circuit and heard a crack and smelt a bit of burning - something shorted. I have plugged my Arduino into my PC with a USB, the ...
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98 views

Arduino Micro not providing regulated power

I have an arduino micro that works fine off USB. I need to power it from an external 12V power supply. When I connect the 12V supply to the adjacent VIN and GND pins, the arduino will not power up. ...
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99 views

Can I power a Wemos D1 R2 via the VIN and GND pins?

Can I power a Wemos D1 R2 via the VIN and GND pins? If so, at what voltage?
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696 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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85 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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Transistors to use for eight voltage sweeps from two PWM Arduino pins

On my Arduino Mega, there are two PWM pins open. There are eight analog voltage inputs to a datalogger. They are connected through a PCB, and I need test them with a DC voltage sweep. (There are many ...
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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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30 views

How to measure multiple voltages (Thermocoupes)

How would one measure many (20-100) small voltages in the 0-80mV range with an Arduino? I will need to amplify them and put them into the ADC. But i also need to switch between them. I want to ...
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Making a voltmeter for PV system over 60 VDC

I'm trying to make a voltmeter for my PV system that can range from 24 VC to 120 VDC. I'm aware of the fact that we have Arduino modules available that can work for 25 VDC system. However in my case ...
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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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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 ...