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Questions tagged [power]

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

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1answer
16 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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4answers
62 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 ...
0
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1answer
30 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
58 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
107 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 ...
0
votes
1answer
21 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
91 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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0answers
9 views

Powering a 6V motor from a 5V USB battery pack [migrated]

I'm trying to run a 6V/1A motor from a 5V/2.2A USB battery pack (i.e. a phone-charger battery bank). I'm using a Pololu boost converter to make 6A (>80% efficiency), but the motor never starts, it ...
0
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1answer
30 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 ...
-3
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1answer
27 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
19 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 ...
0
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1answer
34 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
28 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
23 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 ...
0
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1answer
87 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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0answers
28 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
54 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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votes
3answers
57 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 ...
0
votes
1answer
26 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 ...
0
votes
1answer
59 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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0answers
26 views

Possible race condition using ADXL345, external interrupts and sleep

Setup: I have an Adafruit ADXL345 attached to an Adafruit feather 32u4, via I2C lines and an interrupt line. Goal: The microcontroller should be in a sleep condition when acceleration values are ...
0
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1answer
50 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
43 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 ...
0
votes
1answer
31 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 ...
0
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1answer
30 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?
1
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1answer
21 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
26 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 ...
1
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1answer
85 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 ...
-1
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1answer
334 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 ...
2
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0answers
33 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 ...
0
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1answer
54 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 ...
1
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0answers
34 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
21 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() ...
-1
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1answer
38 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 ...
-1
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2answers
65 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, ...
0
votes
1answer
104 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 ...
0
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0answers
71 views

STM32 (F103C8) could not wake up after sleep

#include <RTClock.h> #include <libmaple/pwr.h> #include <libmaple/scb.h> RTClock rtclock(RTCSEL_LSE); #define SCB_SCR_SLEEPDEEP 4 #define SCB_SCR_SLEEPONEXIT 2 #define ...
0
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0answers
46 views

Can too much power consumption cause NodeMCU to trip?

I made a home automation setup that involves a NodeMCU and a 5v relay module. Now, this setup automatically disconnects from the WiFi randomly. It sometimes connects immediately, sometimes it takes ...
0
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2answers
53 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 ...
0
votes
1answer
49 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. ...
1
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3answers
56 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 ...
0
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2answers
71 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 ...
0
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0answers
30 views

PWM voltage appears to be low (~0.33V) and fails to trigger a PWM dimmer LED controller

I am attempting to use the Arduino Uno to tune the current on a SparkFun Femtobuck LED driver. The driver itself appears to work fine and outputs 0.33A when the PWM pins are not connected. However, ...
1
vote
1answer
37 views

Powering a Sim800L Module

I am trying to use a DC power supply. I am thinking whether I can use this power supply to provide power for Sim800L module. After some research, I gathered that the Sim800L module requires a max ...
0
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0answers
55 views

Waking up a NodeMCU when force load is applied to device

I am currently designing a device that will take measurements from a load cell that is in tension. I am using a v1.0 NodeMCU device that features an HX711 load cell amplifier and is running off of ...
1
vote
1answer
36 views

Maximum power rating for Arduino UNO revision 2 (SMD)

I have located the 5V voltage regulator chip on my Arduino board which I am hoping to use to power an attached device (which draws up to 500 mA at 5V). The chip is next to the plug for the external ...
0
votes
1answer
79 views

Are my stepper motors being burnt out? What is the issue here?

I am building a mini-cnc laser engraver as shown in this intructable and this youtube video. I have built the circuit (minus the jst connector and two male pins at the top left of the board) and have ...
0
votes
1answer
40 views

Can I solder wall cord directly to servo?

I have a servo which requires 7.4v and a wall power cord which says the output is 7.4v but the connector does not fit that of the servo. Is it safe to snip off the end of the wall cord and solder the ...
1
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0answers
28 views

Arduino Fio and Solar Pairing

I'm creating a weather station and want the station to be completely power independent. I'm using the Arduino Fio (https://www.arduino.cc/en/pmwiki.php?n=Main/ArduinoBoardFio) and have estimated the ...
0
votes
1answer
25 views

Should L, TX, RX led light on while connected with laptop

Dear Sir, I need to know that should led light named as L, TX, RX should be on when we connect it with laptop? Because when I connect it with laptop led light turns on for 1 or 2 ...