Questions tagged [power]

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

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1 vote
1 answer
54 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 ...
0 votes
0 answers
55 views

How to reduce power consumption using ADC attiny arduino

i have finally created the code and it works perfectly with internal 8mhz crystal but when i shift to external 8mhz as per the systems demand, the current consumption during sleep mode stays between ...
0 votes
0 answers
19 views

Power saving and pc interrupts on ATMega324PA

I have an ATMega324PA and I want to power down and only wake on CAN receive (working on int 0 successfully), on a schedule, on pcints on 6 digital inputs, and on serial receive - either serial0 or ...
0 votes
1 answer
71 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 ...
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
105 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 ...
0 votes
2 answers
2k 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
38 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
7k 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
78 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 ...
-1 votes
1 answer
117 views

How to power LILYGO ESP32-S3 1.9" T-Display without USB?

Noob question, I'm sure, but - I have one of these little LILYGO ESP32-S3 1.9" T-Display boards. Linked up with my PC, downloaded my code, runs fine, but I can't get the thing to power up from ...
2 votes
3 answers
141 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
546 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
8k 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 ...
0 votes
0 answers
59 views

How to lower the power consumption of this ESP32 during delay(500)?

The following code works. It does the following: wake up when pin GPIO0 is connected to GND (the pulse duration is 400 milliseconds) once every 10 wakings, I send the current index to a server with ...
3 votes
2 answers
477 views

Set control register to low in ds3231 rtc

I have been using ds3231 rtc module for keep tracking and make alarm along with backup battery. when I used it for first time it worked fine. but now it doesn't keep track my time when the power lose ...
2 votes
1 answer
419 views

Wemos D1 mini and JSN-SR04T-2.0: Type of power supply affects the sensor readings

Pretty similar to what is described here I have the strange problem that my sensor readings are affected by the type of power supply I use. Whenever I connect my D1 mini through USB with laptop ...
3 votes
2 answers
611 views

Bluetooth Communication Not Working with DC Power But Works With USB Power?

I am running a 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 ...
0 votes
1 answer
250 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 ...
-3 votes
1 answer
194 views

If Arduino digital pins can be used as power supply pins then why do we need VCC pins? [closed]

If Arduino digital pins can be used as power supply pins then why do we need VCC pins? VCC pins work the same as digital outputs , don't they? So why do we still need VCC pins to power components
1 vote
2 answers
493 views

How to fix HC05 burning even after while using voltage regulator?

I'm using two circuits for my wireless head mouse project, one of them is a transmitter circuit with Arduino Pro Micro, HC05 Bluetooth module, Elechouse Voice Recognition Module V3.1, GY-521 module ...
-1 votes
1 answer
34 views

Arduino Nano Doesn't Upload Any Code After Connecting It In Reverse (Rotated 180°)!

I've Made A PCB Which Includes An Arduino Nano. I Soldered Some Female Pin Headers Instead Of Soldering The Arduino Itself, So That I Can Easily Plug/Unplug The Arduino Board. It Was All Good, Until I ...
0 votes
0 answers
67 views

Atmega32u4: Reduce power consumption while keeping USB active

I have a USB powered board, that should consume as little power when idle as possible, while keeping the USB connection alive. The device only sends data to the host, doesn't receive any, so the ...
-1 votes
1 answer
19 views

Driving APA102C strips from Mega 2560

I have written (cobbled together from code snippets) an Arduino program that pushes various patterns down 160 APA102C LED strips (5). I originally was using a 5V 40A power supply and everything worked ...
0 votes
1 answer
479 views

Why can't I use Jeelib Sleepy on the Teensy 2 along with Serial

I have been using the Jeelib Sleepy functionality for several years now to achieve low power states on the Arduino ATmega328/1280/2560 boards, specifically the LoseSomeTime functionality. I want to ...
0 votes
2 answers
93 views

Lag in sensor reading when Arduino Powered with 12V adaptor

So I am trying to power an arduino to measure water flow. It works all fine and dandy when I am powering it with laptop, but when I directly power it with 12V 1.5A adaptor the readings take a second ...
0 votes
3 answers
70 views

Voltage drop when power from AA batteries

I am using a Arduino MKR 1010 Wifi board to control 4 servo (PS-1109MG). All the circuit is powered by 4 AA rechargeable batteries (1.2V * 4). Arduino is powered through the Vin port. Below is a ...
2 votes
2 answers
2k views

Where Can I Find a 12v Solder-less Breadboard Power Supply?

I am trying to find a 12 V input and 12 V output breadboard power supply but I can't find one. I am making an Arduino-controlled lock but the Arduino cannot power the lock strike by itself so I need ...
0 votes
1 answer
83 views

DHT11 stops working when power comes from a power supply board

I had a mini project with a DHT11, a temperature and humidity sensor, working perfectly on my Arduino UNO clone. Then, I bought a power supply board, that can feed the sensor with the 5V it requires, ...
2 votes
2 answers
243 views

Arduino Uno SD card storage

I am interested in storing accelerometer data to an SD card. Since power consumption is the main consideration of my project, it is important to do as few writes to the SD as possible, because the SD ...
2 votes
1 answer
3k views

Can I use and external power supply and USB at the same time on my Arduino?

Can I use the Arduino with an External wall-wart and the USB at the same time? I need to power more LEDs, and the USB on my computer can only supply so much. But, I didn't want to destroy my ...
3 votes
2 answers
1k views

Sleep mode and watchdog at the same time

Suppose we want to save battery power, and we use sleep mode and also prevent the Arduino from hanging and use the watchdog timer. The problem is here that when the Arduino goes to sleep the watchdog ...
-1 votes
1 answer
48 views

How to wire an ESP32-S2 Dev KitM-1 for power?

I'm putting an Espressif ESP32-S2 Dev KitM-1 into a project box. The box will have 12VDC power and a 5V buck converter for the Dev Kit. Do I need to use the USB port to power the Dev Kit or can I ...
-1 votes
1 answer
642 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 ...
1 vote
2 answers
128 views

Arduino Nano: HUGE voltage drop on VIN

I am building a small automated indoor greenhouse. I want to use an Arduino Nano to control some LEDs und a fan (both through relays) and a water Grove Water Atomization module. Everything works fine, ...
1 vote
3 answers
704 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 ...
5 votes
4 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
46 views

Does an 5V 2.1 A will fit for this Led Schema?

Hello I would like to create an Arduino protoype with Led WS2182B. I currently have Arduino NANO (not UNO, like in this schema) 65 Led WS2182B = Which gives me 3.9 Amp of suply for full brighness (65*...
0 votes
1 answer
390 views

Power source for Arduino uno, sparkfun usb shield and adafruit motor shield

I'm having trouble powering my boards altogether. Right now, I'm using 8x AA batteries to power everything. Running my arduino with one shield runs fine, but not with both shields stacked on top of my ...
1 vote
3 answers
1k views

How to save data in arduino when it's power goes off

I am doing a project 'arduino based switch operation'. Here the user needs to set a time to turn on relay and set time to turn it off. The problem is that I want to supply power to arduino using ...
0 votes
1 answer
203 views

USB-C to USB-C cable Arduino is not responding even not powered by this cable

Hi I want to connect arduino NANO to my laptop with Type-C (USB-C) ports (on below image left side [4] and other side 3). Now I bought a USB-C to USB-C cable, because it appeared to be the right tool, ...
1 vote
0 answers
68 views

Putting samd-based board into sleep mode

I'm using a SAMD21G18A based board - the arduino zero, for a battery-powered wearable project (a type of computer mouse). I'm trying to figure out how to put the device to sleep, when it hasn't been ...
1 vote
0 answers
111 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 ...
1 vote
1 answer
68 views

switching power sources

I have a small project I am working on that accepts power from either a 5v DC power source or a USB power source. Now, I know that both of the power sources are effectively 5v. I have measured the ...
1 vote
0 answers
69 views

Arduino port not discovered with bootloader / Did I fry my board?

I have a Arduino Nano 33 BLE that I've been using for a while. I usually upload new programs to the board through USB with the board in a bootloader loop. The other day this stopped working. The board ...
-1 votes
1 answer
48 views

Using Analog Pins for Power

I'd like to power something needing 5V DC using the Arduino Uno analog pins. Specifically, I'm following the "Fun Plug-in Hack for Arduino UNO" section of this Adafruit tutorial. It states: ...
1 vote
1 answer
1k views

Can I power a Wemos D1 R2 via the VIN and GND pins?

Can I power a Wemos D1 R2 via the VIN and GND pins? If so, at what voltage?
1 vote
2 answers
2k views

Power 5v from l298n to 5v pin arduino

im using the l298n module, and 3x 18650 batterys (near 12v total), and supplying 12v to the 12v pin of the l298 module. Can i use the 5v pin of the module to power the 5v pin of arduino? Or i need a ...

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