Questions tagged [arduino-uno]

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1answer
26 views

Can we use nodemcu in real-time projects [closed]

I have been working on some small iot projects using nodemcu. So I have an idea to make those nodemcu projects into real-time . The places like home, office, school
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3answers
68 views

Interfacing LM19 temperature sensor with Arduino

community! I have a problem as follows. I've been trying to interface the LM19 temperature sensor using Arduino. I made a function to read and compute the temperature from the sensor according to a ...
0
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1answer
33 views

Battery connected to TP4056 will not operate load

I have a simple circuit with an Arduino board (load in the diagram) that I want to power using a solar cell via a TP4056 board. The 18560 Lipo battery is for powering the Arduino during night time. It ...
0
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1answer
49 views

A simple Arduino Uno HC-05 system doesn't work

I have an Arduino Uno, HC-05 module and an LED. I want to connect the HC-05 to my phone and with an app be able to turn on and off the LED and at the same time sending a message from the Arduino to ...
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2answers
74 views

Can LM35 temperature sensor be used to measure temperatures in bone in an in vitro setting? are they comparable to K type thermocouples?

I belong to the medical field. I have zero knowledge about electronics. For my thesis, where I will be measuring temperature within the bone during drilling, I am required to use a temperature sensor ...
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0answers
40 views

How to measure impedance of sensor's traces?

I'm designing a humidity sensor as a semester project and I want to measure impedance of these traces: I don't have specialized impedance measuring instruments for this. As I'm thinking, this should ...
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0answers
42 views

Addressing the RAM on the DS1302 RTC timer chip with an Arduino

I'm trying to access the RAM of my DS1302 RTC chip. According to the data sheet, I need to clear bit 7 of the control register. The control register can be accessed at address 8Eh. To test this out, ...
0
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1answer
22 views

VNH5019 motor controller

So I want to use the VNH5019 motor Controller shield for the Arduino Uno for a project. My question regarding this is the voltage of the motors. Since they differ from motor to motor I'm not sure ...
0
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0answers
42 views

Software to detect certain sounds?

I’m trying to incorporate into an arduino, some programme to light up an LED when it hears certain sounds. Basically Shazam. This app uses the fourier transform to break down songs into frequencies ...
0
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1answer
26 views

Combining multiple bar type load cells to measure large weights

This is my first post here. I want to make a scale that can measure weights up to 60kg. I have three 20kg bar type load cells. I can successfully measure weights with the load cells individually (just ...
0
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1answer
45 views

MAX7219 led matrix prints unwanted artifacts when it is powered up

I’ve got Led matrix 32x8 which is driven by MAX7219. Like this: MAX7219 Dot Matrix Module Microcontroller 4 In One Display with 5P Line When I power it up, I can see different glitches. How to power ...
0
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1answer
76 views

Initializing to MicroSD Card with Arduino produces error code 0x43, 0xff

I am trying to interface with a 32GB MicroSD card with an Arduino Uno, but the code consistently fails at the initialization stage. Below is my schematic (sorry for the horrendous schematic, I'm not ...
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1answer
67 views

Why does my IR receiver spit out random codes when my motor is on?

I'm learning electronics and trying to understand why my IR receiver spits out random codes when my motor is on. I have a basic setup with this: Arduino Power supply set to 5V IR sensor receiver ...
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1answer
75 views

Arduino lack of accuracy in AD conversion

let's consider this simple piece of code: ...
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0answers
148 views

Modulate/demodulate 125khz signal to 433Mhz transmitter module (2.5Ghz carrier)

I am trying to implement a project which consists of two circuits. Circuit A receives a 125khz AM signal and modulates it to 433Mhz CC1101 which then uses 2.4Ghz carrier to send at longer distance. ...
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2answers
86 views

Clarification on adding capacitors in parallel

I have a 5 metre strand of WS2812B LEDs, at 18W per metre. I also have a 120V to 5V-30A power supply I plan to connect them to. The data pin will be connected to (for now), a PWM pin on an Arduino ...
1
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1answer
81 views

Arduino AREF pin

In Arduino UNO R3 official schematic the AREF pin is not connected to anything: While in most online Arduino schematics (such as this one) it's connected to a 100nf capacitor and then to the ground, ...
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2answers
83 views

Arduino - Not outputting 2 separate signals

I’m trying to get an Arduino to output 2 signals with different frequencies for a project.The schematic of the circuit is shown below. I’m trying to experiment using Pulse Width Modulation to give me ...
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0answers
144 views

Arduino UNO, L298N Stepper Motor Drive Waveforms

I am driving an unknown stepper motor using a little red L298N board from eBay. The board is sometimes called Qunqi L298N Motor Drive Board Module. I used a 19.5V laptop power supply to power the ...
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1answer
87 views

WRL-1368 (ESP8266) wifi module briefly flashes blue LED once when powered up, then nothing happens

I bought a WRL-13678 wifi module, but when I connect it to a 3.3V power source, the blue LED flashes once, then nothing happens. I tried powering it from a 3.3V breadboard power supply (connected to ...
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2answers
124 views

Can I control 6-7 devices of 12v max (each) with Arduino Uno?

I have to control following devices: 2 × Gear motors (each 12V, 200mA, speed & direction) 1 × Motor (12V , 1.2 A, on / off) 1 × Motor (3V, 110mA, on / off) 1 × dc pump (...
0
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1answer
70 views

Why my circuit only draws max. of 2.8V across the electromagnet? (Circuit picture included)

I created a circuit using Arduino Uno and the goal is to use pulse width modulation (PWM) so the voltage across the electromagnet decreases from maximum value to zero, and then the cycle repeats. The ...
1
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1answer
84 views

12 V Solenoid Valve Not Opening

I am a chemical engineering student. I need to control a valve and pump system using an Arduino Uno. I was testing out my 12V DC solenoid valve with a variable DC power supply, and noticed that the ...
0
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0answers
36 views

What configuration is needed to use an ATMega328p micro-controller on a breadboard

I previously bought an Arduino Uno that came with a store bought/prebuilt PCB and ATMega328p to program it and use the pins. I also have a second ATMega328p that was bought by itself and I ...
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3answers
129 views

Connecting Arduino to 10hp 3 phase ac motor?

I want to connect Arduino to 3 phase 10 hp ac motor. I just want basic functionality that is I should be able to turn it on or off using the code. Is it possible to do with 3 phase solid state relay? ...
0
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0answers
237 views

TMC2130 with Arduino UNO

I have the Bigtreetech tmc2130 and trying to get it running with an arduino UNO. I have tried using the driver in my 3d printer and it works in SPI mode. I have tested the stepper motor driver with ...
0
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1answer
42 views

Different level TTL driving each other? A problem?

I connected a GPIO of a 3.3V level board (schematic, pin is 5V tolerant) as output to a 5V Atmega328p (schematic) pin configured as INPUT_PULLUP. I perform a low active control function with that. ...
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2answers
149 views

Buck converter for Li-Ion 2s battery charger

I'm currently doing a project that requires the charging of a 2s Li-Ion battery. I have an 18V 10W solar panel that I want to charge my battery using a buck converter. Im controlling the switch and ...
1
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1answer
325 views

12v DC brushless PWM fan burnt out via Arduino Uno

I’m working on a project where I want to control the speed of a fan using a microprocessor. I read several posts about using an Arduino Uno to control the PWM function on a 4 pin fan you find in PCs, ...
6
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4answers
2k views

Can a USB port passively 'listen only'?

I have a small dedicated controller built around an Arduino that accepts commands from a PC over USB (serial). The communication is one-way -- the controller never sends data back to the PC. Now I ...
0
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3answers
75 views

Arduino Uno reading a logic 0 signal as 1

I have a program on my Arduino Uno that needs to execute quickly, so I'm trying to carry it out by dealing directly with registers. I made a few recent changes to my code, which was originally working ...
0
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1answer
23 views

Running MG996R servo using Eneloop Pros

Recently I just bought 2 pack of Eneloop pros, and have fully charged it. By using a multimeter I saw that the voltage went up to 1.3 ish after it is fully charged. And I'm planning on using 5 of them ...
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1answer
75 views

Don't know which transistor I should use

I am new to transistors. I want to know which transistor I should use which will suffice for my H bridge. My motor draws 1.2A at 6V when stalled.
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1answer
58 views

Servo arduino using eneloop

Say if i use 5x eneloop AA batteries to run 6x MG996R servo, will it be good enough since im afraid for the motor if it will burn out. I already read the spec sheet what im afraid is the stall current
0
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1answer
130 views

How can I use PWM to power a 1.5v dc motor with an 5v board Arduino UNO?

I tried to calculate the value for analogwrite which is 77 but that doesn't work. I also tried a bunch of other value but none of them spin the motor. Is this possible and am I missing something? the ...
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0answers
30 views

How to stabilize the magnetic levitation system? [duplicate]

I have asked similar question before also but want to try again - Not able to levitate magnet for magnetic levitation project I followed everything from this project but still, the magnet is not ...
0
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1answer
86 views

Using laser engraving for date stamping [closed]

This is my very first big project. I have to build a laser engraving machine for date stamping. I'm using Arduino Uno microcontroller and a CNC shield with GRBL control. Being fairly new to G-code, I ...
0
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0answers
39 views

Circuit B will turned Off for 2secnd and than turned ON

Am really a noob in this regards, therefore, need help to build an easy 12 V circuit which when circuit "A" is powered off enables "B" circuit to switch off for 2 - 3 seconds and then turns on. I ...
0
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2answers
229 views

L293D DC motor affecting LCD display

In the circuit below, I have noticed that when the DC motor (12V) is disconnected, everything works nice. The LCD correctly displays what arduino sends to it. But ...
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2answers
72 views

How to choose proper power supply for 8 servos on Adafruit shield with Arduino Uno controller

I use Adruino Uno micro-controller powered with USB 5V from PC and Adafruit 16-Channel 12-bit PWM/Servo Shield on it with 1000uF capacitor, powered with 6V 2A power supply. Seems like it is not ...
0
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0answers
81 views

Automatic bird feeder with battery using servo

I am considering to create an simple automatic bird feeder with a servo motor and a plastic bottle, like this project, but without remote controller. The thing is that I would like to power it not ...
0
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1answer
62 views

Arduino Voltage Divider Connection

Can anyone explain the connection of the voltage divider in this image, why it's connected to A0? I put a red circle on the section that i don't understand.
-1
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1answer
215 views

Comprehending wiring data sheet for ME3 C2H4 gas sensor

I am humbly requesting an English translation of this image. The only thing I figured out is that the box on the top left is the ME3 sensor I am trying to connect to an Arduino. It has three pins, as ...
2
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1answer
566 views

Advice for this P-Channel MOSFET Power Source Selector

I know there are already questions and answers about P-Channel MOSFETs and power source selection, but I still find myself pretty confused, as many of those are more complex than my circuit or simply ...
0
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1answer
68 views

Powering Arduino Uno with 9 V LiPo batteries

Would it be safe to use two 9 V LiPo batteries in parallel to power an Arduino Uno?
1
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1answer
145 views

What does “Run Power and Ground wires back to the Arduino” mean?

An Adafruit article showing people how to wire up an RGB LED to an Arduino UNO has the warning shown below on its page. For longer strips requiring more than 1 Amp, wire the power directly to the ...
0
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2answers
66 views

Choosing the ground for circuit

Can the GND pin of the Arduino UNO be used as a ground instead of the negative terminal of a battery while using a battery as the power source? If no, do we have the liberty to choose our ground for ...
0
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1answer
50 views

Can I charge a large capacitor with a small resistor?

I am working on a simple Arduino capacitance meter. This project uses twp resistors: a 10 kohms resistor for charging and 220 ohms resistor for discharging. The Arduino is programmed to measure the ...
-3
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1answer
94 views

What if I connected +5V from one source and GND from other to arduino [closed]

I'm just asking... What if I connected +5V from one source and GND from other to Arduino Will it work? EDIT simulate this circuit – Schematic created using CircuitLab Will it work? or ...
0
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2answers
326 views

Use a switch to override Arduino program

I am building a system where I am controlling 2 LED strips using an Arduino Uno, time chip and relay. I have managed to get the lights to turn on and off on 2 separate days at different times. Now I ...