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Questions tagged [battery]

A battery is an electrical power source which is often portable.

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Re-using built-in USB port to charge battery

I'm dipping my toes into using LiPo batteries for supplying power to small devboard projects, currently with an LOLIN S2 mini. So I got hold of a MH-CD42 module, which seemed like a safe way to start ...
macroController's user avatar
0 votes
1 answer
41 views

ESP32CAM behaving unusually

I have an ESP32CAM, a 3.7 Li-Ion battery hooked up to a HW-107 battery protection and charging board and a MT3608 voltage step up module. They are connected like the diagram shown below. Now the ...
Broteen Das's user avatar
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0 answers
64 views

Make ws2812 leds working from arduino uno rev 3 powered from battery

I’m trying to control 64 leds ws2812 from an arduino powered on a lipo battery. Leds are powered from the arduino 5V output When the arduino is powered from my computer, the arduino behaves normally ...
Oscar's user avatar
  • 109
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1 answer
58 views

ESP-WROOM-02 with on-board 18650 battery. How to charge it?

I have a ESP-WROOM-02 module with on-board 18650 battery. V+ and GND are exposed on the board. Can I directly charge the battery using an USB-C connector with the two cables (red and black) directly ...
Frank Piselli's user avatar
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0 answers
24 views

How to bypass any on board circuitry when using an external LDO

I am using an ESP8266 NodeMCU (Amica) module. I am powering it with a 3.7v rechargeable Li-Lion battery (18650). I am regulating the voltage using a LDO circuit. https://randomnerdtutorials.com/...
Eoin Byrne's user avatar
0 votes
1 answer
153 views

I want the Arduino to be in sleep mode by default and have a button wake it up

I saw a library called LowPower_LowPowerLab that can set the Arduino in sleep mode. In their example they put the Arduino to sleep using an external button, is there anyway to invert this behavior? I ...
Zach Harrison's user avatar
2 votes
3 answers
556 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 ...
Krawabbel's user avatar
1 vote
1 answer
644 views

Determine if a XIAO ESP32C3 is charging

When the XIAO ESP32C3 is charging a LiPo battery, there is a small LED on the board that lights up. Is there any way to access this information in an Arduino program?
Jason's user avatar
  • 13
1 vote
3 answers
164 views

are 4AA batteries (6V) power my arduino

I'm actually new to using arduino , and trying to make a simple car, using two dc motors, a l298n and an arduino, the problem is that a 9v battery doesn't seem enough to just power the l298n and one ...
Marouane Rakine's user avatar
1 vote
0 answers
1k views

Powering up a 16x2 LCD display with only a 9V battery

I'm using an Arduino (Nano 33 IoT) board for a project and apparently this board can only supply with 3.3 volts when a 9V battery is connected to it through Vin and GND pins. In other words, I'm ...
Yosor Shishakli's user avatar
1 vote
0 answers
313 views

How to use LiPo powered Arduino Nano BLE when it's charging (with a charging circuit and a boost converter)?

I have a project where Arduino Nano 33 BLE (3.3V operating voltage) is powered by a LiPo battery. The battery is charged using Adafruit's MicroLipo Charger it is then connected to Adafruit's MiniBoost ...
Ivan Novikov's user avatar
1 vote
1 answer
279 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 ...
Davy's user avatar
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-1 votes
1 answer
160 views

Arduino 3.3v pro mini, most efficient use of AA batteries for power

I want to use a 3.3V pro mini that uses a BME 280 to take temp/pressure/humidity, and nRF24L01 module to transmit the data, at ?10 minute intervals. I want to use 1, 2,3 or 4 AA batteries to power it....
user4109's user avatar
2 votes
1 answer
182 views

ESP8266 Wemos D1 Mini Pro v2.0 - Load sharing and battery

I have a simple question regarding the new version of Wemos D1 Mini Pro v2.0 and specifically about its load sharing circuitry. Schematic is here : https://www.wemos.cc/en/latest/_static/files/...
Vassilis Papanikolaou's user avatar
1 vote
0 answers
152 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 ...
Basj's user avatar
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1 vote
1 answer
1k views

Slow WiFi reconnection after deep sleep (6 to 10 seconds)

With my ESP8266, I need to make a simple GET request to a server, and then go to deep sleep (the goal is 1 year battery powered)... until a signal comes on RST and then it starts again. The following ...
Basj's user avatar
  • 398
0 votes
3 answers
165 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 ...
Adrian's user avatar
  • 11
-1 votes
1 answer
84 views

Arduino battery capacity selection based on the current measurements

I'm sorry for this stupid question... I'm not an electronic/electric expert.. In order to select the battery capacity as well as the solar panel I'm measuring the Arduino current consumption. So, I ...
Safari's user avatar
  • 101
-1 votes
1 answer
147 views

Arduino + Solar Charger Shield V2.2: Battery and Solar panels selection [closed]

first of all I would like to apologize for the, probably very basic and stupid questions for you, but I'm not an electronic expert.. I'm implementing my project using an Arduino Mega 2560 (I need more ...
Safari's user avatar
  • 101
4 votes
1 answer
2k views

ESP32 Wifi not working when powered by battery

I'm quite new to ESP32 development. I've been using this devkit for a few small projects and everything was going smoothly until I decided to run it on battery. In particular, the ESP32 devkit I'm ...
luigi's user avatar
  • 63
-1 votes
1 answer
368 views

My ESP32 WROOM clone will not register touch sensor when using a 5v power bank with usb cable

I have a very simple touch sensor program that works fine and lights an led to show the sensor works; while hooked up to the computer via usb cable it works fine. When using a power bank with the ...
JerryG1112's user avatar
0 votes
1 answer
130 views

Could I put an arduino in series with a battery charger?

recently in one of my projects I have wanted to make battery powered. I was wondering if I could connect the charger to the battery and the battery to the Arduino without blowing it. The battery is ...
alexlikesallthegamez's user avatar
1 vote
1 answer
179 views

ESP8266 with HC05 : expecting to receive more bytes then the 63 received

I'm trying to read a Ant BMS 32H with a ESP8266 and a HC05 module. BMS is sending 146 bytes when asking for these by sending DB DB 0 0 0 0 (HEX) I did test with my android phone and the app 'Serial ...
Bart De Pauw's user avatar
1 vote
0 answers
85 views

What external battery do I need?

For a school project I need to connect an Arduino with an accelerometer gyroscope sensor and 2 mini servo motors. Of course I need a battery for this. However, I don’t know what battery I need for ...
Jim's user avatar
  • 11
1 vote
0 answers
929 views

Using L298n motor driver without jumper (Voltage Regulator)

When I am using 9V supply with motor driver and Jumper connected so the red LED was blinking but when I did the same using 9V and 15V supply removing the jumper LED didn't blink. Neither the voltage ...
Ohm Vaghela's user avatar
1 vote
0 answers
85 views

Arduino UPS without reset

I’m trying to figure out how to make arduino UPS (when the power goes down it should not reset the arduino). Or preferably buy something that will do that for me. I found this, but Im not sure of it ...
krystof18's user avatar
  • 315
2 votes
1 answer
473 views

ESP32 powered for atleast a year

How to power esp32 board this one with soil humidity sensor that sends data to server via wifi every 30 minutes for something around a year on battery? What battery type and capacity should I use for ...
krystof18's user avatar
  • 315
1 vote
1 answer
234 views

arduino nano with lora only runs once if connected to battery

this code works perfectly if connected with usb cable. but as soon as i connect my Arduino nano with battery (two 18650 batteries in series connected to VIN) it runs loop only once. it sends only 0 to ...
LongToeBoy's user avatar
1 vote
1 answer
1k views

Battery voltage measurement with voltage divider

I am using the following circuit to measure the Li-ion 3.7V battery capacity. Figure 1 – Schematic for 3.7 V batteries. This setup works fine for the 3.7V batteries. To be able to measure 9V ...
Zaffresky's user avatar
  • 183
3 votes
1 answer
103 views

Battery for WS2812 Strip? (Something's not right)

I have posted this in a few places, so sorry if you have seen it somewhere else Im working on a battery powered led strip project, iv put the project together and have been testing with a mains power ...
Thomas PomTom Steel's user avatar
1 vote
1 answer
54 views

Using External Power Supply Arduino Uno

I have an AA battery holder for 9V. Two wires come out of it, one for positive and another for negative. How can I wire it up to my Arduino Uno? It kind of looks like this.
Nathan Jiang's user avatar
1 vote
0 answers
369 views

Problem with floating of AnalogRead

For a university Lab course i have to realize a UPS unit with a internal LiPo battery . The unit uses as battery charger a buck converter I have only a problem with the battery charger (buck converter)...
Marco Toni's user avatar
1 vote
1 answer
216 views

Arduino UNO With On / Off Module Switch + Battery Advice

So I have the following connected and the programming works fine when connect by USB The Parts 1 Arduino UNO 1 Laser Module (KEYS) 1 Rocker Switch Module (Standard 3 PIN) 2 Variation Motors (KEYS) 1 ...
Davinco's user avatar
  • 21
1 vote
2 answers
229 views

I need a good battery reccomendation

I have simple project composed of an Arduino Nano, a HC-05 module, and a small toy DC motor controlled using a L293D driver, I want to be able to power this circuit entirely using a battery, here is ...
The Riser's user avatar
  • 123
1 vote
1 answer
450 views

Power LED Matrix With LiPo Battery & ESP32

I want to power an ESP32 with a 3.7V LiPo battery. There's a LED matrix of 64 WS2812 LEDs attached to the ESP32. I learned that I need a buck boost converter to power the microcontroller as it needs a ...
Joh's user avatar
  • 113
1 vote
0 answers
66 views

My car only moves when it is plugged directly into both my pc and battery pack?

i built a car that works with four motors,one motor driver(specifically the l293d),the arduino and the battery pack with four AA-Batteries. The motors work fine though, but they only work when it is ...
adham's user avatar
  • 21
0 votes
1 answer
48 views

Chips & High voltage: Connected in Series?

I have 3 micro-controllers that will be connected to a battery, and I need to provide each of them between 3 and 5 volts maximum. I have 3V batteries but they do not seem to provide enough power, ...
B7th's user avatar
  • 167
0 votes
1 answer
1k views

Calculate battery (18650 Li-ion) voltage using ESP8266-12E

i am trying to calculate the battery voltage using ESP-12E module. I am using a voltage divider circuit to calculate the same. Here is how my circuit looks like: And here is how my code looks like: ...
user3201500's user avatar
1 vote
1 answer
130 views

Is there a 3.3V and 12V 18650 circuit?

Is there an all in one circuit which regulates charging, protects and steps up/down an 18650 battery to 12V and 3.3V at the same time, so I can power a sensor and my ESP32?
Dimitrije Vasiljevic's user avatar
1 vote
1 answer
2k views

What is the best way to power the ESP32 from a battery?

I am making a temperature sensor that can go in a freezer and I am trying to figure out what the best method is. My research has taken me all over the place an I can't seem to find a straight answer. ...
user71866's user avatar
0 votes
2 answers
286 views

How to use a push button & transistor as a kickstarter for power supply?

My goal is to save energy, and I intend to do so by powering a chip with itself, and cut power whenever unnecessary. The best image I can have is of a startled monkey who jumps on the branch, screams ...
B7th's user avatar
  • 167
0 votes
1 answer
177 views

Voltage from batteries in series operating on 3 ATTiny, 3 Buttons, and 3 Piezo buzzers

I intend to power three ATTiny45 chips (each requiring around 3.5V) in parallel with 2 pill batteries (namely Maxwell's CR2032) in series (which would come to around 6V). They will each play a sound ...
B7th's user avatar
  • 167
1 vote
1 answer
63 views

Can arduino nano drive two circuit

I am building a robot snake with a bunch of servos and ov7670. As I see, ov7670 operate with 3.3v and servos needs 5v. I will use Lipo battery for servos for this I need to connect ground pin of ...
HollyPolly's user avatar
3 votes
1 answer
150 views

How to power board plus module with one battery pack

I'm someone who's very new to robotics and the physical side of computers (software guy) so apologies if this is a stupid question. I'm purchasing an Arduino Nano 33 IoT that I'll be using in ...
kfeen's user avatar
  • 33
0 votes
1 answer
237 views

TX Pin Stays Lit After Removing Voltage Regulator

To save power, I removed the linear regulator from my Arduino Nano clone and powered it via the 5V pin from a regulated source (a rechargeable USB phone charger). However, I've noticed that removing ...
I Like's user avatar
  • 205
1 vote
0 answers
94 views

How to connect arduino mega 2650 and motor driver shield with seperate powers source?

I am building a robot that runs only when a matching rfid tag is identified..for that i need motor driver shield for running the motors and rfid module. The problem is if i attach the motor driver ...
Arjun's user avatar
  • 11
1 vote
1 answer
209 views

How do I control a conveyor to start and stop in same location using optical rotary encoder

I am a complete novice at arduino. I just want to know if this is possible before I start investing in components. I need to start and stop a chain drive conveyor {can't slip} powered by a 12 volt ...
Duane G Holstege's user avatar
-1 votes
2 answers
48 views

Certain componenet does not seen to respond when given voltage

I am using a part off an electronics set I got a long time ago. It is off a electronic set called snap circuits rover deluxe Its a disc launcher and I have wired it to how it seems to want to be ...
DigitalRookie4's user avatar
0 votes
1 answer
965 views

9 volt battery not being able to power motor driver [duplicate]

Currently I am using a 9 Volt Duracell A one like this: I am using it to power a motor driver which contains 2 motors within. I can see where the main problem is coming and that is to do with that ...
DigitalRookie4's user avatar
0 votes
1 answer
295 views

Powering Arduino Components with AA in Parallel and Series

simulate this circuit – Schematic created using CircuitLab I have 6 AA batteries that I would love to power my Arduino Nano and HCSR04 ultrasonic sensor. However, for my low power application I ...
I Like's user avatar
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