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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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1 vote
2 answers
63 views

6 V high-torque servo won't function with motor shield

I have only ever been able to get this servo to “somewhat” work when connected to the 5 V pin on the shield, the ground on the shield, and the signal line attached to whatever pin. But 5 V is not ...
0 votes
0 answers
36 views

Power supply on Vin for ESP8266 Amica nodemcu v2

My ESP8266 nodeMCU v2 Amica runs fine if I power it from my computer with a micro USB cable. I successfully uploaded a sketch (extended Blink) and it is doing fine. However, if I power the board with ...
5 votes
5 answers
5k views

Arduino PRO Mini - The pads [was "jumpers"] on the back and Low Power Consumption

I've noticed that on the back of an Arduino PRO mini are two Jumpers next to the A4 and A5 pins, marked with red in the following : Looking at the leads one seems to be a bypass for the POWER Led and ...
-1 votes
1 answer
30 views

How to power 2 MG996R towerpro servo

I am a beginner and tried powering MG996R Tower Pro (180 deg Metal Gear) Servo from Arduino UNO and ended up hibernating the host PC. I want to power 2 such motors (in parallel configuration) for lets ...
1 vote
2 answers
97 views

I'm planning on using 2 arduino boards for my project. Should I use 2 voltage regulators for project or use 1 for both?

For context, my first board would contain a motor circuit with an L298N motor driver while my second contains a controlled heating system that uses 2 relays with PTC heating elements, DHT11 sensor, ...
0 votes
1 answer
899 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 ...
1 vote
1 answer
78 views

Increase in power consumption after brown-out detection (BOD)

I'm working on a low-power energy harvesting project, where I'm considering using an ATtiny85 to perform some minor tasks. The ATtiny is put in Power Down mode most of the time and does not consume ...
1 vote
1 answer
89 views

Code review for timer using RTC and OLED screen

I am building a small art project to display my current age with an accuracy of 1/100th of a second. I am using a XIAO SAMD21, a DS3231 RTC, and a 128x32 OLED screen. Here is what it looks like right ...
0 votes
1 answer
51 views

ATtiny25 - assembly - BOD disable for sleep mode - error [closed]

If I understood the AVR instruction manual correctly, the ATtiny 25 can disable the BODlevel2 fuse by software, but when compiling with Studio 7 (version 7.0.132), I get the error "Undefined ...
-1 votes
1 answer
132 views

Code does not run when Arduino is powered by AC adapter

I'm trying to implement the circuit as shown with an Arduino Nano. The project runs fine when powered via the USB port of the Arduino. However, the code freezes when connected to an AC adapter. When ...
-1 votes
1 answer
890 views

How to properly run four DC motors with an Arduino?

I am working on a project where I have four DC motors that are controlled by two L293D motor drivers. Two of the motors act as the wheels of the robot, and the other two act as a mop. The Arduino ...
3 votes
2 answers
686 views

Bluetooth communication not working with DC power but works with USB power?

I am running an HM-10 Bluetooth Low Energy (BLE) module to transmit serial data (using SoftwareSerial) from an analog sensor onboard my Arduino Uno to a serial terminal app on my Android phone. When I ...
9 votes
7 answers
38k views

How to remember variable values after rebooting an Arduino Uno R3 board?

Is there any way to store the values of necessary variables somewhere (may be in a file that gets updated by the program at various events), which can be read back when program starts after rebooting ...
0 votes
2 answers
3k views

NodeMCU ESP8266 Ver 0.1 not powering on with VIN

I'm trying to power on my NodeMCU ESP8266 Ver 0.1 (thats what is written in board), via VIN and Ground with my phone charger. I'm 100% sure that the USB charger is working, providing 5V, and that the ...
2 votes
1 answer
729 views

Nema 17 stepper motor speed problem

This code is quoted from here. May I know how to increase the speed of the NEMA 17 stepper motor further? I tried to increase the step speed to 2000rpm but it does not even work. It only works for ...
0 votes
4 answers
3k views

nrf24l01+ does not work with a battery, or very unreliably

For a project in progress, I have an Arduino UNO sending a message when a condition occurs, and a Raspberry Pi that listens to it. Both are fitted with NRF24L01+ modules with antennas. It works ...
-1 votes
2 answers
109 views

How can I get servos to not brownout my Arduinos and power supply?

I have a problem with a project where one servo is resetting (browning out) two Arduino Pro Minis running 3.3v/8mHz. The two Arduinos are connected by SoftwareSerial on pins 9 and 10 and the slave ...
7 votes
5 answers
16k views

Can I have backup power for an Arduino device?

I have an arduino project that will work while plugged into a generic outlet. But I want to connect a battery in case the power goes out. I know there are various power sources (coin cell, polymer ...
3 votes
1 answer
161 views

NodeMCU V3 GOT OVERHEATED AND DIED

My NodeMCU V3 got overheated and died. Please help me figure out what i did wrong. Brief Desrip: Project is an RC Car on ESPNOW Protocol. Transmitter setup have an Arduino Nano to take values from Two ...
2 votes
0 answers
42 views

Confusing language on arduino docs about powering via 3V3/5V pins

I'm reading about powering alternatives for the arduino board, and I have run across two confusing sentences in Section 5, powering via 3V3/5V pin. First, it says: 3V3 and 5V pins can also be used as ...
1 vote
1 answer
136 views

Powering a NodeMCU as well as a GSM module

I'm trying to connect a GSM module(sim800L) with a NodeMCU to execute remote operations. But the GSM module cannot be powered using the NodeMCU. So, what are the other ways to power the board as well ...
1 vote
2 answers
141 views

Arduino UNO Power interruption

Do you have to upload the UNO after the applied power is disconnected? Does the UNO retain the code without any power? And when the power is disconnected, if the code is retained, will the timers ...
2 votes
0 answers
75 views

WiFiNINA Reseting Arduino Nano IoT 33 When Powered Externally

This is puzzling me: if I power my Arduino IoT 33 Board from USB, everything runs smoothly. Now, if I power it with 5V on Vin, the board resets as soon as I call WiFiNINA's WiFi.begin(ssid, pass). Of ...
0 votes
1 answer
135 views

The Arduino UNO Pin 3V3 have OUTPUT 5V (measured with meter)

I just noticed that my original Arduino UNO on pin 3V3 have 4.98V output. That's odds. That pins should have 3.3V. So I measured the Vout on the voltage regulator LP2985-33DBVR where that pins is ...
1 vote
0 answers
290 views

Arduino and PCA9685 - Suddenly stopped working

I'm using an Arduino Uno and a PCA9685 board to run 4 servos (of type MG996R). For that, I set up the following connections: SCL -> SCL SDA -> SDA Ground -> GT VCC -> 3.3V As the servos ...
2 votes
3 answers
474 views

Run Arduino Uno with battery AND use 5V output

Newbie here: I built a working binary clock with my Arduino UNO R3, see Picture 1. From my understanding the power supply for the Arduino itself is via USB, and I use the 5V output to supply power to ...
0 votes
1 answer
122 views

Servos jitter when powered by power module

I need 48 sg90 servos to move to a specific position each minute. Now I am using two arduino mega boards to power everything through 6 bread boards but it seems I need more power because some servos ...
2 votes
1 answer
706 views

Arduino MKR GSM 1400: Can I tell from code if the power has tripped

Is there a way to tell if an Arduino MKR GSM 1400 has lost power and has to rely on the connected battery? Ideally, I'd like to do this without adding additional circuitry. Alternatively, can I ...
4 votes
0 answers
55 views

Can I use regular pins (Example: D2, A3, etc...) as serial (RX, TX)?

Python/Arduino Beginner here... I have a DFplayer I am trying to hook to my Arduino and I want to hook it up through the regular pins instead of the RX and TX pins, but I've not been able to find ...
1 vote
1 answer
455 views

How much maximum current do the Arduino Wemos D1 (R1 & R2) consume?

I have been powering my WeMos D1 R1 and D1 R2 Arduinos (with ESP8266) using a simple USB cable connected to a standard charger whose rating is 3.1 amps. Is this sufficient to charge two such Arduino ...
-1 votes
2 answers
4k views

Nodemcu powering with 5.2v and 2A?

I bought a this voltage regulator . DC-DC 5v 8A voltage regulator. ıts supported 8-35V input voltage . And i want to use this with 12v power supply. But i searched on the internet . Nodemcu max amp is ...
1 vote
0 answers
88 views

ESP8266-01S only coming back from DeepSleep every 2nd time

I'm using an ESP8266-01S for a battery-powered project. The ESP is in DeepSleep, a doorbell relay pulls RST to GND, bringing the ESP to life to do some stuff, before going back to DeepSleep. My ...
1 vote
1 answer
57 views

Program work when used Delay() but same program doesn't work with millis()

I'm running a dc motor using esp32 and mosfet by taking readings of IR. Program works fine when used delay() but same program doesn't work when uploaded using millis(). //This uses fixed delay() // ...
1 vote
0 answers
70 views

Running a 5V, 4pin pwm fan with Mega2560

I have a Mega2560 and would like to use it to power a single fan and display. The fan is a 5V fan that draws 260mA and I can't find power specs for this display. I can't find a clear answer for how ...
1 vote
0 answers
197 views

Arduino Nano 33 BLE power consumption optimization

I am working on building a sensor using Arduino Nano 33 BLE that will measure temperature using two thermistors and angle changes. The measured values will be transmitted over Bluetooth to a ...
0 votes
0 answers
40 views

channels on logic level shifter outputs high

so I have a logic level shifter which is TXS0108E ,I use it to shift the eps32 ouput volatge to 5v to be used with motor driver ,when I test it with multimeter , all the channels on the B side outputs ...
-1 votes
1 answer
40 views

How to produce multiple DC voltages for a single project with different dc requirements

I have a project that has 2 12V .2 amp fans, and 1 30 3 amp LED COB panel, and a 5 V Arduino. I was wondering if there was a simple method to power all of these devices from a 120 V wall outlet? As of ...
4 votes
1 answer
507 views

Power Supply Problem with Arduino Yún: Using a long USB cable

I want to use an Arduino Yún as a kind of outdoor weather station. I want to supply the power for the Yún with a 5V USB-Charger. Using a normal USB cable everything works fine. But as the weather ...
3 votes
1 answer
300 views

Arduino | external power supply and USB at the same time

Arduino | external power supply and USB at the same time I have got an Arduino Mega 2560 project with many sensor and outputs. Right now I’m supplying it with an external stabilized 5V over the 5V pin ...
1 vote
1 answer
238 views

AA alkaline batteries on firebeetle?

I would like to power a dfrobot firebeetle 2 using 3 alkaline batteries. I tried connecting the battery pack to the GND and VCC, but the board does not seem to react. What pins should i connect the ...
5 votes
4 answers
10k views

Two arduinos one power source

I was surprised that this question had no answer on Stack Exchange and I can't find much about it elsewhere so, in the hopes that it will be useful to people other than myself, I'd like to ask: How ...
1 vote
1 answer
516 views

ESP32 failing to read from DHT11, MH-Z19C sensors

I got MH-Z19C (CO2 ppm) (datasheet), and DHT11 (temperature) sensors from Ebay and followed instructions online to set it up with my ESP32 board (ESP32). I'm using a breadboard and 5V/3.3V power ...
2 votes
1 answer
188 views

Wemos C3 Mini (ESP32-C3) does not run firmware unless connected to pc

I've been using ESP32s and ESP8266 for a few years now and I thought I'd give these little boards a shot, they were cheaper for Bluetooth/WiFi combo, and I don't need all the bells and whistles of a ...
6 votes
3 answers
10k 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 ...
-1 votes
1 answer
183 views

Why can't my four batteries (6V) can't power this circuit while usb 5v from arduino can?

I have this circuit And I want it to power all the led rgb (100 in total), I want to make a independent portable circuit, so I don't have to use the usb power. The thing is when I use this circuit it ...
2 votes
1 answer
2k views

Ultrasonic sensor returns random values on external power supply

my Problem is, that I get random values from my ultra sonic sensor if my arduino is connected to any external power supply (vin port 30) on my arduino nano. If I power up from the laptop usb port, I ...
2 votes
3 answers
241 views

Powering Arduino and transistors with one power supply > 12V

So say you want to use transistors with your Arduino Nano to power components, which require greater than 12V. If your power supply is more than 12V, is there a way to safely use the same power supply ...
0 votes
1 answer
959 views

How to work with WS2812B 16x16 matrix panel from aliexpress

I'm completely new to Arduino, and I want to build the project using an LED 16x16 matrix, but I don't know where to start. On the internet, I keep finding these custom matrix panels and they aren't ...
4 votes
2 answers
10k views

What happens if we connect GND and +5v?

What will happen if I by mistakenly connect GND and +5v of an Arduino Nano? Is there any protection for it? Or will it get short and fry out something?
2 votes
2 answers
1k views

Connect 5V relay to ESP32 WROVER B board

I need to use a ESP32 WROVER B based MCU board with a standard (cheap) one-channel 5 V relay (e.g. to switch on a mains-power appliance). Attempted removal of excess solder around the headers ...

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