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

0
votes
1answer
32 views

Is SRAM erased when putting Arduino into sleep_mode_pwr_down?

Question In the interest of reducing power consumption, I am putting the Arduino into sleep mode between taking sensor readings. However, the data from readings are stored in arrays, and must not be ...
2
votes
1answer
35 views

How can I make a power button for my project powered by a USB powerbank? [on hold]

I've solved the battery power supply issue for my Arduino project by simply connecting a USB powerbank. However, I just realised that I can't come up with a good way to add an on/off button! There ...
0
votes
0answers
36 views

Seemingly free floating and too high voltages

I have connected a moisture sensor, a usual LDR, a BH1750 and 4 DS18B20 sensors to my Adruino MKR GSM 1400. A few days ago everything worked fine when mounting it to a breadboard. But now for some ...
0
votes
0answers
24 views

Keep battery pack awake and run motor every 6 hrs

My circuit is a Nano that runs a watchdog timer code to keep it asleep and wake it every 6 hours to run a small dc motor for 5 minutes and then go back to sleep. The watchdog timer code works great ...
0
votes
1answer
34 views

Can adjustable constant current/voltage source be made with Arduino?

I would like to create a 18650 battery automatic management system that can handle and restore used up cells using solar panels for power. To do that I need to create adjustable constant current ...
1
vote
1answer
29 views

Safely powering a relay from same source as attiny/arduino?

My project involves using ATTINY to control a 5v relay (specifically JZC-11F and will be ground triggered) in an automotive setting. I keep seeing the warnings of powering a relay from the same ...
0
votes
1answer
38 views

Help me determine the power consumption/rating of the circuit below? [closed]

Please help me determine the circuit's power consumption from the battery and help me outline the steps to calculate?
0
votes
1answer
42 views

Cannot use radio transmitter after switching to LowPower library

My Arduino Mini board has DHT22 temperature sensor and 433MHz radio transmitter modules. I'm using DHT and RCswitch libraries to make use of them. Code looks like this: void setup() { tempSwitch....
1
vote
2answers
45 views

How to produce multiple DC voltages for a single project

So the title pretty much says it all, but for an example, I have an arduino board, 5-12 V, an LED bank 18 V, and an ultrasonic mister 24 V. I know some brute force methods to power ...
1
vote
3answers
54 views

Turn off power to a moisture sensor except when reading values

I have an Arduino Uno and a moisture sensor (looks like a YL-69 clone) submerged in water. I need to read the sensor's (analog) value every 3 min or so. The problem is: the sensor is always powered by ...
0
votes
1answer
26 views

Use lowpower-libary and still use serial connection and other things

I managed to get the LowPower libary working on my Arduino Micro. This code works perfectly: #include <LowPower.h> void setup() { // initialize digital pin LED_BUILTIN as an output. ...
1
vote
1answer
49 views

DHT11 Sensor : Stand-by or Shut down?

I have an ATmega328P monitoring room temperature and humidity. It is enough for me to monitor every 8 seconds. In these 8 seconds, I am putting my Atmega to sleep. Now , I want to know : Does ...
0
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0answers
7 views

Arduino micro standby issues

I wanted to set my arduino to standby, by using the lowpower.h libary (https://github.com/rocketscream/Low-Power). Using this code to suspend it for 8 seconds: LowPower.powerDown(SLEEP_8S, ADC_OFF, ...
4
votes
4answers
82 views

Send out a short signal every 10 seconds to an arduino

In order to reduce power consumption, I want to resume my Arduino from standby mode every 10 seconds. For this a hardware interrupt is necessary. Is there such a device that can create a quick ...
0
votes
1answer
28 views

Accidentally shorted 5V to GND on Arduino Nano, can I reuse the ATmega328p?

I've shorted 5V to GND and the Arduino Nano (CH340 clone) stopped working (power LED light is dimming). The board had a burning smell, and I also checked if other Arduini on the same USB port worked ...
1
vote
2answers
51 views

Do I need to power off the Arduino board before doing something?

Is it safe to build a circuit while the Arduino board is powered? Should I power the board only when I have to upload the program?
0
votes
1answer
22 views

Do I need an external power supply for the SG90 micro servo?

I have a Uno R3 and although I can add an external power supply for the SG90 micro servo it would make the project more complicated. Can I power the servo using the 5v pin of the Uno R3? I measured ...
1
vote
1answer
27 views

Power RFID module using GPIO

I am building an ESP8266 device that uses RFID but need to conserve battery power. The ESP is a Wemos D1 Mini and the RFID module is a RC522 (still waiting for it to arrive), which needs 3.3 V. ...
0
votes
0answers
32 views

Is this a good way of making a low power attiny? Unpower instead of sleeping

I am making a low power rf remote that just has 3 buttons and sends rf signals accordingly. I've been trying to make pin interrupts work when it's in deep sleep but it's a huge hassle. And then I ...
0
votes
1answer
20 views

How to connect both MicroSD module and MPU9235 power in an arduino

I'm really new at electronics and wiring, so please be kind. Coding is my stuff, but I'm trying to learn something here. I'm working with a project to store the movements of a skateboard through a ...
0
votes
2answers
34 views

Schematic interpretation, where to put resister?

I'm new to schematics, trying to figure out where to put a resistor (no instructions other than the schematic) I'm told I need: 10K variable Resistor x 1, 4.7K Resistor x 1, 100 Resistor x 1 But I ...
-2
votes
2answers
65 views

Connecting Arduino to a Peltier Module [duplicate]

I am trying to make a cooler using Peltier Modules, the Peltier Modules and the fans switch on when the Temperature sensor attached to the circuit reads above a certain threshold. But I know that ...
0
votes
2answers
38 views

How can I power a servo and Arduino from the same power supply?

I have an ESP8266 NodeMCU which I'm using for an automatic blinds project. The NodeMCU struggles to power the servo on its own, so at the moment I am using a 5 V supply for the servo and a USB ...
0
votes
1answer
76 views

How to achieve smooth motion with a servo motor?

I'm trying to control the MG995 servo motor with an Arduino Uno, but the motion achieved by the motor is kind of erratic. The servo motor is externally powered from a 2200mAh 7.4V 30C LiPo battery ...
0
votes
1answer
110 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 ...
3
votes
1answer
44 views

Noise when running Arduino close to analogue audio circuit

TL;DR: My Arduino is injecting a lot of noise into an analogue audio circuit, even when not physically connected. I'm experimenting with using an Arduino as a low-frequency oscillator in audio ...
0
votes
1answer
29 views

Is there any problem in running Arduino logic to 12V LEDs?

I want to run a strip of 300 12V LEDs (Adafruit Neopixels with WS2811), with my Arduino. Is it safe to connect a follows, or is there some "separation" between voltage levels needed? 5V voltage/out ...
-2
votes
1answer
44 views

Controlling two-pole contactor using Arduino [duplicate]

I am working with Packard C230C contactor to develop own EVSE. For a simple start i just want to toggle contactor using Arduino. OpenEVSE is already doing it. Just want to know how do they do it and ...
1
vote
1answer
69 views

Powering a water pump with nodemcu [closed]

I want to use a nodemcu to water my plants. I connected a pump with a 2N2222 transistor (I know i should add a diode and a pull down on the gate). The pump is DSL370 and when it is off i measure 4.4V ...
-1
votes
2answers
67 views

Understanding how to power objects with a relay (featherwing, feather huzzah)

I am trying to learn how to control a relay to power various household objects. I bought a power relay shield for an adafruit feather huzzah, and I have just set up the arduino blink sketch to provide ...
0
votes
1answer
38 views

will push button work if input and output is connected to two different arduinos?

For example we have two arduinos, we make a push button circuit in which we need 5vdc and ground, we take these two connections(5vdc and ground) from our first arduino and then give the output of that ...
0
votes
1answer
28 views

Arduino Wall Wart and Relay Board Power Supply

I am relatively new to Arduino, and have been doing a project to trigger an LED/alarm when movement is detected to be over a certain threshold value. I am using an Arduino Uno, an LED/buzzer (https://...
0
votes
1answer
105 views

Wemos D1 doesnt drive Relay [closed]

I recently bought a Wemos D1 board and tried to connect a relay and test its connection. I got an example server from here and executed. I connected D5 to a Relay's data and 5v and GND from Wemos ...
1
vote
0answers
12 views

Correctly Powering Lilypad Arduino

I am trying to correctly power a Lilypad Arduino that is attached with an HC-05, Lilypad temp sensor, and Amped pulse sensor. So far I have found that powering by plugging the Lilypad into my laptop ...
0
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0answers
146 views

Trying to use NodeMCU ESP-12e, a 5v relay AND a solenoid lock on same 12v power wall-wart

Noob here, so be gentle. Using a 12v-5/3.3v power board, NodeMCU powers relay fine, 100% of the time. Add in the solenoid by soldering a line from the wall wart into the COM spot on the relay, and ...
1
vote
1answer
36 views

Power consumption for arduino

I am using an Arduino SMD UNO r3 board ,and connecting thermal sensor MLX 90614 , wifi modem ESP 8266 , a buzzer and an arduino based sound sensor . How much power distribution will it require ? What ...
1
vote
1answer
79 views

Using a 3V latching relay to power up ESP8266

I'm trying to use a 2-Coil Latching Relay like TXS2SA-L2-3V for powering up a ESP8266. My idea is to activate the relay by setting the first coil to high and deactivate the coil by setting the second ...
2
votes
2answers
154 views

Setting 10 RGB Strips Independently from Single Arduino

I want to control 10 different 12V RGB LED strips independently from a single Arduino. As a clarification - I've setup a bunch of NeoPixels and understand how to wire and control them independently. ...
1
vote
1answer
30 views

LiPo + charge/boost circuit vs pre-built “power bank” - contrasting portable power sources [closed]

Portable 5V power for my projects - I was about to get the necessary parts to wire up an OEM LiPo battery (3.7V battery, boost circuit, charging circuit) when I took a peak at pre-built "power banks". ...
1
vote
2answers
166 views

External power vs usb power

I built a sample of my project on a breadboard using little 700mh leds and other components that easily ran off my computers usb. Now I’m building my project to full size. This includes 12 7w leds, ...
0
votes
2answers
48 views

Powering USB cable that powers Arduino with regulated 5V

I am having an issue with external loads causing the computer I have my Arduino connected to to momentarily drop out, which causes the Arduino to lose USB power momentarily and the port drops out and ...
1
vote
0answers
31 views

Arduino Uno with data logging shield has a problem switching power sources

I have the basic Adafruit "Light & Temperature data logger Tutorial kit" made, and it works well when connected to a PC, but when I unplug the PC USB connection and hook it up to another power ...
-2
votes
1answer
46 views

USB reset fails on arduino due because of 5v on digital pins

I have the signal channels of four 5v magnetic encoders connected directly to the digital pins of the arduino due. I am aware that this is not allowed according to the specification which says that ...
1
vote
1answer
53 views

Small Baseball Scoreboard using 2 to 3 breadboards

I'm helping my son start an Arduino small baseball scoreboard (roughly 2 or 3 breadboards in size). Im thinking to use qty 2, 2 digit 7 segment LED's (score of each team), an LCD 1602 module (inning ...
0
votes
0answers
33 views

Arduino (or similar) board with GPIO pins that can output 80mA - 100mA

I am looking for a board like the Arduino with GPIO pins that can output 80mA - 100mA. Does anybody know if such a board exists?
0
votes
1answer
359 views

Looking for Power Bank with “Always-On-Feature” [closed]

I want to build a mobile weather station with an Arduino and some sensors. I want to use a power bank as power source. The Powerbank should support "Always-On", because weather data should not be ...
0
votes
1answer
48 views

Arduino - Raspberry Pi serial communication

I need to connect a Raspberry Pi and an Arduino Uno through serial communication and decided to follow this guide, which mentions the use of a voltage divider. I understand the connection to the ...
0
votes
1answer
56 views

Most compact way to power 5V Arduino boards?

So I have quite a few ideas for wearable devices using Arduino boards (mainly the Nano and the Micro clones). With that in mind, I want to determine what the best way to power an Arduino is, with ...
0
votes
1answer
19 views

Can external power supply above current limit lead to errors/shutdown arduino?

I have an Arduino Due that is connected both over native USB to PC and a 12v power supply in the Jack. Mounted on the Arduino I have a custom PCB that drives 3 motor drivers. The Motor drivers are ...
1
vote
1answer
54 views

Powering an Arduino Uno using 2 (or as few as possible) AAA batteries

[Background] I'm constructing a water bottle rocket which is going to use apogee detection and a mechanism for the parachute release. Connected to the Uno will be an accelerometer and a servo, now ...