Questions tagged [electricity]
Use this tag to indicate the flow of electricity at higher voltage than that used in Arduinos themselves. Examples can include having an Arduino use a relay to switch the electricity for a 120 Volt device like a fan or a light.
58 questions
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Arduino and custom pcb
I am looking to minimize the size and assembly complexity of my arduino projects. Is there any easy way to integrate something like an esp8266 onto my own pcb. I don't want to have to solder it on. In ...
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Could I put an arduino in series with a battery charger?
recently in one of my projects I have wanted to make battery powered. I was wondering if I could connect the charger to the battery and the battery to the Arduino without blowing it. The battery is ...
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How can I check if my thermostat is on?
I'm working on a project to better understand how my home cooling system behaves. I'd like to produce graphs of temperature in various areas, overlaid with when my existing thermostat turns the A/C ...
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Pulsing 3v into a capacitor to create custom Voltages
I was wondering if it is possible to create diffrent voltages by just pulsing power into a capacitor,
Im using an esp32 which can only output 3v or nothing on its GPIO pins, and i need to make it ...
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Best way to add external power supply when main PSU is a solar charge controller?
I have a 12V 20A Solar Charge Controller (which is part of my existing Solar Panel System Setup connected to a 12V Sealed Lead Acid Battery) that I will use to power up some pumps with the help of ...
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What is happening when digitalWrite(pinname, LOW) is invoked after pinMode(pinname, INPUT_PULLUP)?
I read the Arduino official docs on digitalWrite and am confused about what is happening from an electrical perspective when digitalWrite is invoked on INPUT_PULLUP pins.
Say my code says this:
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- 170
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I'm working on a NodeMCU project and have a small doubt about LEDs and resistors
In my NodeMCU I want a statement to turn on an LED, which is easy, just use pinnumber, HIGH. But, what I'm trying to do here is connect multiple LEDs to one pin like this:
I just wanted to know if ...
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Can i connect in pin of relay module to Analog pins of arduino instead of digital pin?
Im a complete beginner
Im making a project using relay modules and arduino. but all the digital pins of my arduino are filled.
I wanted to ask if i can use the analog pins to connect my relay module ...
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Which relay module to buy and what is the difference between 1 channel and 2 channel relay boards
I wanted to d a simple circuit using Arduino to control the lights in my house. But i do not know which relay module to use my house runs on standard 220v ac.
Can anyone tell me weather this relay ...
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Uno doesn’t get enough power from 5v barrel connector. Why?
I’m using a 5v 20a power supply run through a barrel connector into an Arduino Uno to control an LED strip. When only the barrel is connected, the green light on the Uno comes on but the yellow light ...
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Touching a capacitive button, non-mechanically
This is not about using a capacitive button to control an Arduino; it is the opposite. I would like to "touch" a capacitive button on another conventional device. There could be a way like ...
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Is this circuit risky for an Arduino Uno?
I will show a connection diagram between my Arduino Uno and a DSC HS2032 panel (alarm system).
The DSC panel uses 12V and I don't know the voltage fluctuation.
The yellow and green are RX/TX ports.
...
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how do i know what battery(how much ampere and voltage) my circuit needs to work perfectly?
i really love to make a lot of things but i always have this problem that i don't know how can i determine what battery(with how much voltage and amp)my circuit must have to work perfectly! please ...
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CH340 chip getting fried after connecting Arduino to a powerful 12V souce
I'm using a 120 W DC power supply connected in parallel with ESC and Arduino nano through Vin. However, somehow the Arduino get fried near the CH340 chip, i.e. around the big black square chip near ...
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line following IR sensor not giving readings at 3m wire length?
I am using line following IR sensor with arduino mega. I need the sensor 2-3m away from arduino since the length of rover is 2m (sensor front & motor back). However, I cannot get accurate analog ...
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