Questions tagged [power]

This tag is for questions regarding powering and/or power consumption of Arduino systems.

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2answers
857 views

Press On Hold Off Power Switch

Hi everyone I am hoping someone here can help me. I am trying to make an arduino turn my project on and off.Using a relay. I am looking for it to act like a computer power button. A short press to ...
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1answer
483 views

Measure current across shunt resistor (Power Analysis)

I am trying to reproduce the side-channel power analysis attack described in this paper: https://pdfs.semanticscholar.org/7946/a8ee82658e2ffb017270331f220a55f5ace6.pdf for educational purposes. The ...
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1answer
162 views

Low power error with serial connection

So I want to create an application where I can send data with a SIM-Module, and when it's not needed it should fall into a "standby-mode" because it's battery powered. But I always get this exact ...
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3answers
476 views

Powering the Arduino with a battery and reading the battery voltage

I am trying to display the battery level as it is being used to power the arduino. I have tried powering the arduino through the USB and the battery voltage is read accurately, when compared to the ...
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1answer
303 views

24v LED strip with common anode?

I have a 5m strip of 24v tunable white LEDs and I'm trying to figure out what I need set it up. There's a pad for V+ and then one for brightness and one for warmth. If I plug the V+ in V+ on a 24v ...
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1answer
103 views

Powering LED Strip at both ends shorts my psu?

I've got a 200 LEDs strip of sk9822's hooked up to a 5V 8A power supply. As expected, at full white, there's considerable voltage drop and the far end of the strip turns from white to amber. I wanted ...
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1answer
203 views

Arduino ds3231to TM1638 problems,alarm clock project

Good morning, I am coding an alarm clock on arduino by using a DS3231 and a TM1638. The code works and the time updates in the serial monitor,although the time doesn't update on the tm1638. I'll ...
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1answer
4k views

Arduino Nano IoT Power Consumption

I am trying to reduce the power of my Arduino Nano IoT. I would like to run it using a battery over a longer time period. I thought this would be possible when putting it to sleep most of the time. ...
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0answers
481 views

Reading I2C data from SW6106 register

I am using the SW6106 powerbank IC as an I2C but no matter what I have tried I couldn't read something other than "FF". Datasheet for the IC. Timing diagram for reading data: Timing diagram for ...
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1answer
44 views

Determine if Arduino is rapidly pulsed on and off several times

Greetings fellow humans! I've set myself the task of ascertaining whether an Arduino has been rapidly power cycled to force it into a setup state, a feature common with many IoT devices. So I ...
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1answer
3k views

How to assign an interrupt to a button press with an ATtiny? (interrupt not fired with my code)

(Here is finally a solution). I'm using the following code on a ATtiny45 to assign an interrupt to a button press (pin #7, PB2, INT0). However the LED doesn't blink when the button is pressed, as if ...
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2answers
3k views

How to deep sleep ATtiny/ATmega (to run for years with batteries) but still detect a button press?

Question (TL;DR): what is the optimal method to deep sleep (to run an ATtiny45 or ATmega on batteries for 1+ year) but still be able to detect a button press? Is it possible to deep sleep until a ...
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2answers
228 views

Can I use laptop USB port to power Nodemcu if every port used

I wonder if a laptop USB port is enough or I have to use an external power supply if the NodeMCU under heavy load. Here is my list of sensors and port used. 3.3V 3.3V D1 to D7 A0 GND Sensors: ...
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3answers
351 views

wake from powerDown to check sensor then put back to sleep

I am using an Arduino Pro Mini with various sensors. I am powering it with 2 3.7v 3400mA batteries which I recharge with a solar panel. I take a reading from the batteries and if the reading is ...
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2answers
96 views

Common button on two Arduinos and two computers

We have two computers giving two presentations that need to be triggered in sync. I know how to send the space button via Arduino, but I want to check it will be safe for the computers. If each ...
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3answers
648 views

Does a pulldown resistor use less battery power than a pullup resistor?

I am designing a circuit connected to a simple open-close sensor, like a switch. For ease of construction, the circuit with the sensor switch closes to ground, and uses a 1 MΩ pullup resistor to Vcc ...
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2answers
440 views

12V but what Ampere?

So if my arduino will draw around 800mA @5V and the dc-dc buck converter around 266mA @5V plus solenoid 1.2A @12V, is it a good idea to get 12V 4A (48W) power supply? Since Filip Franik told me that ...
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1answer
26 views

Arduino uno + 5 IR obstacle sensor

I have IR sensor with current draw 100ma i have to connect 5 of them is i can connect all 5 with arduino directly or i have to use external power suplly for them
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0answers
307 views

Arduino-Controlled LED Matrix issues

I am making a 20 x 15 LED matrix, and am having some super annoying problems. I was hoping you all could help me find some answers. It is very important to note that I am following BitLuni's video ...
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1answer
177 views

Floating power supply for Arduino - Is it still connected to the USB ground?

I am trying to power my Arduino Mega 2560 from a benchtop power supply. I plan to essentially feed in a 9V supply directly on the Vin pin and connect the GND pin to the floating ground pin on the ...
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1answer
78 views

Can I power Raspberry Pi 3 via 3V3 and GND pin? [closed]

Can I power my Pi 3 using the 3v3 pin (pin 1) and GND pin (pin 6)? Also, if I want to protect the board from power surges can I just put a fuse between my power supply and the 3v3 pin? Thanks in ...
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1answer
80 views

Circuit with a tip120 works with a Led but, don't with a vibrator motor

I have 2 Arduino Nano's. One with RF transmitter and the other with an RF receiver of 433 MHz and both have two 3v vibration motors. I want one Arduino to send a string to the other Arduino to let him ...
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1answer
100 views

Running many devices on 5V pin. How to provide external power

I'm using my Arduino DUE 5V pin to power a lot of sensors and I'm worried about the drop in current. I'm powering the board using the USB port. Is this the correct way or is there a different way of ...
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0answers
511 views

HC-SRO4 always returns zero no matter what I do?

Wondering if it's the sensor or the code? can anyone help? I've used the code here /* HC-SR04 Ultrasonic Sensor with LCD dispaly HC-SR04 Ultrasonic Sensor VCC to Arduino 5V GND to Arduino GND ...
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2answers
57 views

Push Button to Drive Power to Servo

I am currently doing a project for a class which uses a few other components such as an LCD, a servo, and such. I want to use a button which acts as a circuit breaker on the Vin of the servo in which ...
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2answers
361 views

Feeding microcontroller and linear actuators (motors) with the same power supply

I have already made a diagram using a motor controller. I want to use only one power supply to feed arduino and motors. I want to use MDD10 dual motor driver. The details of the actuators each one is:...
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1answer
266 views

LowPower.idle isn't waiting

I am trying to have my Arduino wait in a low power idle state given by the LowPower library made by rocketscream on an Uno. However, when I try to have it wait for 8 seconds, it seems to not pause at ...
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3answers
723 views

Arduino Uno not working after Short-circuit

While wiring up my new Arduino Uno R3, I accidentally shorted the 5V pin and the GND pin (for less than a sec). It was powered by a 12V 500mAh power supply through the Arduino DC power jack. . The ON, ...
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3answers
2k views

Powering SIM800L

With peak consumption at 2A, the SIM800L needs much more current than can be supplied by an Arduino or NodeMCU. What is the best strategy to power this module, considering that you have access to a ...
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1answer
41 views

Powering Moisture sensor via arduino pin

Can someone help me. I have this sensor I just connected it to the 3V pin of my arduino only I read online that its better to connect it to a Arduinopin for power so you can put it off when not ...
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1answer
1k views

Problem with powering ublox NEO-6M GPS module

Firstly, I'd like to mention that I'm a beginner. This is the first time I've worked with a GPS module. The serial monitor is completely empty when I upload the following code to my circuit: #...
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1answer
270 views

Problems / doubts on battery-powered Arduino Nano WiFi weather station I built

I've almost finished my first Arduino project and I'm realizing I might have gone a bit over my head - I'm a web programmer, I have a very basic electronics knowledge and started tinkering with ...
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1answer
57 views

How to power and switch on / off multiple boards at the same time?

I have many nodes. Each node consists of an MPU9250 and ESP32. Each node functions independently. They don't interact with each other. How can I power all of them at the same time, and switch them ...
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1answer
34 views

Any reason to acquire more watts than really needed?

Basic question (again): I have a LED-strip that requires 5V, and each LED (150 in total) requires about 60 milliamps. Calculating everything, I need 3 of these LED-strips (450 LED in total). This in ...
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1answer
164 views

3.3v pin on a 5v Pro Micro?

I have a arduino pro micro that runs on 5v. I also have a Max4466 that needs 3.3v, however the pro micro doesn't seem to have a 3.3v VCC. Is there any way to attach the max4466 to the Board?
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1answer
229 views

Powering Motor shield and Arduino Mega Separately

I'm trying to build a fire fighting robot, that uses 2 BO DC motors, 2 Servos - MG996R and SG90. For them I'm using Motor Shield v1 of Adafruit's make that uses 2 L293D IC's and a 74HC595 shift ...
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0answers
29 views

how do I detect a data connection?

on an ardunio, is there a way to detect if a data connection (vs power only) is present? I want to have my arduino behave differently if connected to a pc, or on stand alone power. specifically, I ...
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1answer
2k views

Powering two stepper motors with A4988 drivers

New to this site and wanted advice and sanity checking on my project design. I know there are similar questions to this but I couldn’t find one that was closely similar to mine. I’m creating a device ...
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1answer
4k views

power consumption of esp32

I'm currently working on an IOT project with my esp32, ill need it to run on batteries, I will only be needing "active mode" with wifi once per hour to upload some data to a database and then go back ...
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1answer
200 views

Arduino due erase button and power switching

Last days I have been investigatin schematics of arduino due board. The purpose of proper understanding of schematics in crucial for me, beacuse I indend to build myself my own board with some minor ...
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1answer
781 views

Why does my code treat my sound sensor as if it's always HIGH

I have a sound sensor that was working perfectly fine as I was using it as a clap sensor to turn lights on and off. However, I tried to change the code to make it work a little smoother and for ...
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0answers
87 views

Turning on controller with button and turning off with a timeout

I am making a device controlled by an ESP 8266 and am wanting to save power by having it power down when not in use. The desired behavior is for a momentary button press or vibration sensor activation ...
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0answers
27 views

USB power on arduino digitalRead is normal, but, gives error when using buck(step down) converter

I am using arduino for digitalRead(). i've been using INPUT_PULLUP, and when using USB power, all seems normal. but, when i switched to power supply and buck converter(12v to 5v), the digitalRead() ...
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1answer
1k views

Can I power 25 LED via USB?

So I'm currently working on a project where I build a WordClock. To display the current time I use WS2812B LEDs which should be white when turned on. Only about 25 leds per time will be turned on, the ...
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2answers
168 views

Powering Arduino with Thermostat Power

So I want to make an Arduino based thermostat controller. I'm good with the semantics behind this, there's just one detail I want to make sure I get right: Power I know US thermostat power is 24VAC, ...
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1answer
788 views

Power supply affecting sensor readings ESP8266 and JSN-SR04T-2.0

I have an ESP8266 Wemos D1R2 Board with a JSN-SR04T-2.0 ultrasonic range finder and everything works perfectly when I have the device connected to my computer USB or via a 12V battery into the onboard ...
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2answers
126 views

Can I leave AVcc disconnected?

I am using ATmega8A standalone but analog pins (Port C) have not been use. Due to ATmega8A does not have a PRR (Power Reduction Register) to disable ADC and TWI. I would like to know, is it a work ...
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1answer
58 views

Powering Arduino AND Relays

I have a 5V (5.3V) switching transformer that goes to a 7805 voltage regulator and powers Arduino, Arduino controls 4 relays using BJTs. those relays getting power directly from the same power source. ...
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3answers
75 views

How to keep the regulator cool while battery powering the arduino and accessories?

I'm trying to build a battery operated hand lantern. It has the Arduino, an MPU6050 accelerometer, and 4 APA106 (WS2812B-like) LEDs. If everything's powered through the Arduino's 5V pins, that's 80mA ...
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2answers
84 views

Handling arduino output current

I need to power an actuator that requires 12 volts and consumes between 5 and 10 amperes depending on the weight it is charging. Therefore I bought a power supply of 12 volts and 10 amperes. My ...

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