Questions tagged [power]

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

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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, ...
-1
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1answer
16 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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0answers
18 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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19 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 ...
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0answers
22 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 ...
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2answers
47 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
46 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
53 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
57 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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0answers
27 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, ...
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1answer
12 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 ...
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0answers
8 views

In HLW8012 schematic, where should the Referenced ground be connected [migrated]

In the datasheet of HLW8012, the both 33nF capacitors , 1K resistor and 0.1uF capacitor are connected to GND. I'm not sure where should I connect those ends of components marked with GND symbol, (To ...
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1answer
117 views

The need to use logic level converter

Why do we need level logic converter to have 5V or 3.3V? Because in Arduino Uno/Mega (don't know about other boards), they already provide 5V and 3.3V for us to use.
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1answer
66 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 ...
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0answers
41 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
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1answer
30 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
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1answer
42 views

Arduino Smoothing does not work as expected

I using the standard example of smoothing: /* Smoothing Reads repeatedly from an analog input, calculating a running average and printing it to the computer. Keeps ten readings in an array and ...
0
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1answer
38 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 ...
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0answers
27 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
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1answer
20 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 ...
0
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1answer
17 views

Options for powering a Futaba servo

In one of my earlier questions it was determined for me that my Futaba Servo should not be powered directly from the 5v pin of my Arduino and should instead be powered by an alternative source. I was ...
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0answers
24 views

Loop failure after unset amount of time

I am building an art piece that takes in input from three rotary encoders and two buttons. and outputs data to a large neopixel display and 2 large 4 digit seven segment displays. The displays are ...
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1answer
43 views

Power Arduino controlled by another Arduino by MOSFET [closed]

I would like to control power to Arduino B from signal of digital pin from Arduino A. I use IRFZ44N MOSFET as switch and +12V DC source. The Arduinos have common ground. The connection is: Gate: ...
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2answers
70 views

Use ATTiny as a battery-backed RAM?

So, I found an interesting article the other day, and I'm trying to build a project that could benefit from a battery-backed memory (no wear limits, but keeps data over power cycling). The article ...
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1answer
20 views

What type of power supply is the Arduino Due’s 5v pin and what is its current?

I’m looking to use a Futaba Servo with my arduino Due and was told it requires a “high current 5 volt supply” and I don’t know much about current so excuse my arrogance. I know the arduino Due has a 5 ...
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1answer
47 views

Arduino Fio: Battery/Solar Powered Weather Station [closed]

I am trying to make a Solar Powered Weather Station. I'm using the Arduino Fio, with a BMP180 and a DHT22 as the sensors. There are sleep modes activated with the Fio and the Xbee. It seems like the ...
3
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3answers
29k views

Powering up LED strip - How many amps?

I want my Arduino to drive a LED strip. The LED strip in particular is the 3528 non-waterproof type. To power this up, I need a 12V power supply. My LED strip is going to be 5 meters. Now my ...
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0answers
30 views

Min/Max current for supply input of mega2560

What is the min and max current the mega2560 can take for the 5v supply input voltage of the chip itself, not just the arduino mega?
0
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3answers
473 views

Use 5V SD-Adapter on 3.3V System

I want to use a Catalex Micro SD Card Adapter in Combination with my Arduino MKR GSM 1400. The problem is, that the Arduino uses 3.3V to operate but the SD Adapter needs 5V (or at least 4.5V) to ...
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3answers
70 views

Modifying normal doorbell to get notification

I'm really not used to Arduino and I would like to know if it would be possible to tweak my doorbell, most specifically the bell itself, to embed a small arduino that would be able to send a ...
0
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3answers
2k views

Arduino Nano and SIM800L on Battery Power

I'm very new to Arduino and everything related but I'm highly interested to learn more. However, I've run into a problem right in the beginning. I want to build some sort of portable emergency/...
0
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3answers
113 views

Connecting arduino ground with battery powered remote control ground

I soldered a cable to the button of a remote control and I want to simulate that button press by setting the pin to input mode and back to output (LOW) again. For this to work I connected the ground ...
0
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1answer
104 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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2answers
197 views

Powering Arduino Uno and Ardumoto Motor Driver Shield

I need to power an Ardumoto Shield to drive two 12V DC motors. I was planning to connect a 12V battery to the Max 18V input on the Ardumoto and a 9V battery to the barrel jack input of the Arduino Uno....
3
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1answer
571 views

Powering Multiple Servos From One Battery- What is my circuit missing?

I'm working on a robotics project right now and my limited DIYer knowledge of electrical circuits is failing me. I need to power 7 Rage Standard Metal Gear Servos (RGRS104-16-6vm) and 4 RadioShack ...
0
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1answer
97 views

I'm getting NaN for readings on my DHT22 sensor when using 3v3 pin, but not 5v pin

I have a DHT22 temperature sensor and DS1302 RTC module connected to the 3v3 pins on an Arduino Nano. Both the sensor and the RTC module are rated to work on either 3.3V or 5V, but the recommendation ...
-1
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1answer
74 views

Getting at the PS_ON pin on a RAMPS1.4 mounted to a Mega

Got it! Check end of post for solution. I'm running a Mega 2560 with a RAMPS 1.4 Shield which is usually used for 3D printing applications. For my use case I only want to get at the stepper motor ...
0
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1answer
2k views

ESP8266 light sleep - can't wake up

I am attempting to implement a light sleep mode on an esp8266 (feather huzzah) which, when a button is pressed, wakes the system up so that it can continue its normal task. I cobbled together some ...
0
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1answer
302 views

WS2812B LED Stripe going crazy with Arduino and External Power Supply

I have a simple connection here: A WS2812B 5m 300 leds strip 5V; A Power Supply MS-150-5 150W 5V; Arduino with a simple code to blink 10 first leds; TEST: If I connect my power supply to my LED ...
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0answers
14 views

Tower pro mg3996r servo problem

Recently I bought 5 original TowerPro mg3996r metal gear servo for my Robotic's project, I tried to test run each of them separately with arduino built in example servo's 'SWEEP' code. I tried to ...
0
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1answer
67 views

SIM808 return the same AT command

I am using atmega 2560 and SIM808. When I send an AT command to SIM808 it returns correctly. But sometimes I have seen that SIM808 returns the same AT command. Sometimes it occurs due to lack of power ...
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1answer
74 views

How to filter the power supply for an Arduino in a vehicle (car, motorcycle)?

I want to use an Arduino (maybe Nano, maybe MEGA) in my motorcycle (a new KTM with lots of electronics). I checked my test circuit (with the MEGA) and it uses about 100mA (with 5V connected to the 5V ...
0
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1answer
89 views

Switch controlled power saving esp8266

I'm trying to build a door sensor with the esp8266. I want it to be battery powered and use deepSleep for power saving. I'm going to use a normally closed reed switch between D0 (GPIO16) and RST. I ...
1
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1answer
3k views

Motor shield power from Arduino pro mini 5v RAW Pin 150mAh cannot run servo

linked to my old question, Pro Mini 5v with Adafruit motor shield v1 power sharing problems I figured out and use one 7.2v battery (6 AA cells), and link it with RAW pin to Pro mini and join its 5v ...
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2answers
1k views

Using a pushbutton to power Arduino on and off

I need help adding a pushbutton to provide power to an Arduino to save power, as I am using a battery and the same button to power it off. This is the circuit I wish to implement. Thanks.
2
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1answer
44 views

From Exploring Arduino Text

I am working thru the Exploring Arduino text mostly with success up until chapter 4. I have most of the parts required but for Figure 4-3 I used the following: 100nF Capacitor, (In place of 1uF ...
6
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3answers
3k views

How to stop Arduino from drawing power through USB

I'm working on an embedded project, where I use arduinos as a "sensor shield" for RaspberryPi (I have model B). The problem is, that the RaspberryPi's USB port is not powerfull enough to drive WiFi ...
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1answer
223 views

Wemos mini pro switch power from servo with mosfet bs170

I got a servo connected to a wemos/arduino with a capacitor(470uf). Before I didn`t use a cap. Now with the cap the device use to much power while sleeping(capacitor on the servo). I want to switch ...
0
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2answers
49 views

How can I discard power from a device I want to read from?

I want to read the data line from a device that normally interfaces with a controller. It has 3 pins, 3.3v power, gnd, and data. I don't need the power line since the Arduino will be USB powered and I ...
0
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1answer
18 views

H Bridge for microcontroller power management?

Is it fine to use L298 N Dual H Bridge Stepper Motor Driver Module to control power of other ICs in a multiple microcontroller setup? I intend to reduce power consumption in by powering communication ...