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Questions tagged [arduino-uno]

The tag has no usage guidance.

0
votes
2answers
90 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 ...
1
vote
2answers
41 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
votes
0answers
56 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
votes
1answer
43 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
votes
1answer
62 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 ...
1
vote
1answer
140 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
votes
1answer
62 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
vote
1answer
111 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
votes
0answers
49 views

ESP8266 WiFi relay module constantly switching on/off the moment power adapter is connected

Totally new to this. Tried googling and watching some youtube videos but can't seem to find anything that can related to my case. Do let me know if I'm doing something wrong. I bought my module from ...
0
votes
0answers
101 views

Update Mega328 Transistor Tester with Arduino Uno micro controller

I'm trying to update Mega328 Transistor Tester with Arduino Uno micro controller. Here is my Uno and Mega328 connection and Avrdude setting, including particular error: avrdude.exe: verification ...
0
votes
2answers
60 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
votes
1answer
40 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 ...
-5
votes
2answers
110 views

How to connect my Sony camera to an UNO ATMega238p Arduino? [closed]

I saw a cool project online where they had a little camera connected to an Arduino with a motion sensor, the camera takes pictures whenever the sensor gets activated. So, I'm trying to build the same ...
-3
votes
1answer
93 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
votes
1answer
68 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 ...
0
votes
2answers
355 views

Connect RS422 interface with Arduino Uno

I have a fishfinder,Lowrance Carbon HSD 7, and I want to connect it with the Arduino Uno to let the fishfinder transmit the Sonar data and GPS data via NMEA0183. According to the maker's site, the ...
1
vote
1answer
59 views

Stepper Motor Voltage

I am having a problem making a stepper motor run. The problem is that the voltages that I am reading from the motor never reach zero (they move from a high voltage to a smaller voltage) so they never ...
2
votes
0answers
45 views

Trying to replicate the behavior of an smartcard without sucess. What I am doing wrong?

Background: I am a software engineer and I am starting to research security hardware in my free time. The one I am starting with are contact smartcards, which are defined by the ISO 7816 standard. I ...
1
vote
2answers
54 views

Powering a project from a car cigarette outlet

In my car boot there is a cigarette style power socket, I have a one of these: https://www.amazon.co.uk/gp/product/B077D71HXY/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 I also have an Arduino ...
0
votes
1answer
374 views

Interfacing of Proximity Sensor with Arduino [closed]

I want to interface OMRON Proximity Sensor E2A-M12KN08-WP-C1 2M with Arduino Uno. How do I interface it with the Arduino? Also, where will I find the relevant starter code? I am new to this and I ...
0
votes
1answer
65 views

Help understanding this schematic : Why is the diode there (AT89C2051 Programmer)?

I am having trouble understanding the following portion of schematic from AT89C2051 programmer circuit. Please help me comprehend what is going on here. Here is what I understand: A1 directly ...
1
vote
1answer
133 views

ESP8266 module emits random/garbage characters on external supply (but works on arduino's 5v & 3.3v)

Summary: With arduino's 5v & 3.3v supply , ESP8266 module emits boot messages and responds to AT commands on serial terminal@115200 baud as - boot message: ...
3
votes
1answer
169 views

How To Reassign The MISO Pin?

So I have a PCB with an LCD hooked up along with a 595 shift register. Unfortunately, when I designed the board I didn't realize that the LCD library used SPI, which on the Arduino Uno is pins 13-10. ...
0
votes
1answer
114 views

SPI read error with MCP2515

In an attempt to interface a motor controller, battery management system and maximum power point tracking device on a CAN bus, I used the MCP2515 and TJA1050 CAN breakout board. All these devices send ...
0
votes
3answers
135 views

How can I see an output from SCL?

I am new to electronics, circuits, etc. Currently I am reading I2C and synchronous serial communications. As I understand, two devices must be connected to the same CLOCK wire so that the slave knows ...
-3
votes
1answer
619 views

arduino controlled spark plug with ignition coil

I am trying to built a ignition system which will have the following Spark plug Ignition coil (I don't know the spec of these. but this one is from Honda Activa) Some switching circuit I found ...
-7
votes
3answers
628 views

how to make a arduino based voltage regulator? [closed]

i have a project for my microcontroller lab for making voltage regulator using arduino. Can anyone help me with this.
0
votes
1answer
155 views

Compatible driver motor for JGA25-370

I'm new to electronics so i came here to ask some questions : 1) i have 4 motors JGA25-370 (6v, 58rpm) and 2 driver motors L298N ; If i put one drive to control 2 motors i will have max torque from ...
0
votes
0answers
39 views

Bluetooth Controls instead of R/C Controls for simple Holonomic robot

I am new here and with little experience in electronics. I have assembled this holonomic robot, see link: https://shop.wickeddevice.com/product/omniwheel-robot-complete-kit/ It has 3 Omni-...
-1
votes
1answer
77 views

DB25 to TTL logic (voltage control) [closed]

I am trying to control a 6-bit digital step attenuator for a project, with an Arduino (here, Arduino Due or Arduino Mega). The given attenuator has a software to control it. So, I connected the ...
-1
votes
1answer
99 views

Are pins of my Arduino fine? [closed]

I was making an Arduino project. It was a very safe project as I copied it from Arduino's official website. The project was about adjusting the speed of blinking the LED on 13 pin of the Arduino. I ...
0
votes
3answers
77 views

Why is the load output voltage from my relay so low?

I’m trying to build a simple circuit with a relay controlled by an Arduino that will turn on/off a little LED light string I have that was previously powered by two AA batteries (that would be 3V, ...
0
votes
1answer
28 views

1.4V instead of 0V when Arduino signals a LOW

I have motor controlling mechanism as the one shown in the image. I'm controlling the direction of a motor controller from three different sources. DIR1 and ...
0
votes
1answer
34 views

What is a suggested portable power source for 100w Arduino project?

I purchased one of these LED strips. The 16.4 ft, 60 LEDs per meter one. They are connected to my Arduino Uno. I’ve been powering my Arduino through my laptop, but would now like to make it portable....
0
votes
0answers
18 views

Which battery to use to charge my arduino project?

when you are connecting ESP 8266 to an SMD UNO R3 Arduino board along with a sound sensor and a thermal sensor MLX 90614 , how much will be the range of power required to run this project smoothely on ...
0
votes
0answers
151 views

Trying to obtain phase angle using AD 8302 phase detector chip

I am trying to use the AD 8302 phase detector chip to obtain phase angle between antenna's receiving a RF signal due to the vertical separation of the antennas. I want to use the phase angle to ...
0
votes
1answer
64 views

Earth& neutral voltage detection

Can someone suggest me circuit to detect the earth to neutral voltage. I would like to trip relay coil using microcontroller if earth to neutral voltage exceeds 3v. There are device RCB and RCBO ...
5
votes
4answers
1k views

void loop executes even when the while loop inside is true in arduino

I made a simple mobile application to send LED_ON or LED_OFF when a button is clicked. In the below code the while loop is not fully completed while execution but the controller is going to the void ...
0
votes
1answer
148 views

Problem with mesuring value from current sensig pin on VNH2SP30

I connected the Monster Motor Shield (based on the VNH2SP30) to the Arduino Uno and successfully drive the engine, but I can not measure the value from the CS pin on this board (the voltage at this ...
0
votes
0answers
336 views

Using a current transformer with an Arduino Uno

I have a current transformer CR3110 - 3000 It will be used to detect the state of different loads (100w, 1000w, ...). The intention is to use Arduino Uno, to detect voltage in the range 0-5V, like it ...
0
votes
4answers
101 views

Arduino sensor data erratic

I'm a noob just getting my feet wet in EE, so go easy on me, please. I bought an Arduino Uno and have been learning tons in the last couple weeks. I took an LM35 sensor, a generic thermistor (using ...
0
votes
2answers
120 views

Measure alternating voltage with arduino

I'm worried about how to measure alternating voltage with Arduino because it measures voltages from 0 to 5. Please help me with the circuit. What I want is that when: If Vin = - 5V Vout = 0V If Vin ...
-1
votes
1answer
84 views

Big loads turns MOSFET's on despite pull-down resistors [closed]

I am using a FQP30N06 MOSFET to PWM a motor. When I test it with an LED and a PC fan it worked fine, but when I connected it to a big motor it just turns on by itself. I am using the analogWrite ...
0
votes
1answer
41 views

How to receive audio from Arduino into Max [closed]

I'm a beginner with Max and what I'm trying to do is take the the audio input signal going into my Arduino and hear the receiving audio playing through Max. There's a photo below of the patch that I'm ...
0
votes
1answer
72 views

floating pins in arduino [closed]

i have an arduino board when i use analogeread to read the value of A0 without connecting any wire to it ,gives me a value not zero in serial monitor. is my arduino dead or what is the problem? i ...
1
vote
1answer
93 views

Why triac output goes higher than line 230-240 voltage in AC dimmer circuit?

I am using AC dimmer circuit using arduino. circuit is working normally but the only problem is about voltage. as the dimmer circuit varies dimming,the output voltage also increases and decrease. Line ...
0
votes
0answers
284 views

Diagram of L298N with Arduino

1- Am I correct in my schematic if I want to connect L298N to arduino to drive 2 motors ? 2- are the resistors of 0.5 ohm mandatory ? (I saw them in datasheet) 3- Am I missing components in ...
0
votes
1answer
168 views

AD9833 Continuous Frequency Change

I am trying to run AD9833 frequency generator to have a smooth continuous frequency change. I have run AD9833 module as in here using the code below as found in internet and it works fine and the ...
1
vote
1answer
248 views

Why does this component on my Arduino UNO heat up?

Every time that I plug my Arduino into the computer, this chip immediately gets burning hot, way too hot to touch, this wasn't something that i noticed happened after a particular event, I just ...
1
vote
1answer
133 views

Recognize blowing or clapping hands with microphone sensor(Arduino Uno) [closed]

I want to recognize between blowing or clapping hands with microphone sensor(Arduino Uno) and than with DSP to know which gesture is made. I took a lot of samples but when clapping there is no ...