Questions tagged [arduino-uno]
The arduino-uno tag has no usage guidance.
255 questions
2
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Can ATmega328P microcontroller work at 3.3 V with 8 MHz oscillator
I want to use ATmega328P for my project, but I saw in datasheet that to use 16 MHz oscillators. Is it possible to use 8 MHz oscillators?
Could you please direct my attention to other things that I ...
0
votes
1
answer
144
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Using H-Bridge as a way to drive a latching solenoid that requires reverse polarity pulses
simulate this circuit – Schematic created using CircuitLab
I have been working on an Arduino project which requires me to control a latching solenoid through pins on the Arduino uno. The ...
- 11
0
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0
answers
27
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Differences in UV Sensor Readings Between Arduino Uno and ATTiny85 Using AnalogReference
I've been working on a project involving UV sensor readings using both an Arduino Uno and an ATTiny85. However, I've encountered discrepancies in the UV index values obtained from the two different ...
- 103
0
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0
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42
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PHD ULTRA syringe pump communicate with Arduino
I have a PHD ULTRA syringe pump from Harvard Apparatus. I want to establish communication between an Arduino and the syringe pump. The company provided me with a Python code, but Arduino does not ...
0
votes
2
answers
144
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12 V relay buzzing/fast clicking sound when getting signal from Arduino UNO
I'm new to electronics but I decided I want to try and build a simple circuit to control with my Adruino UNO R3.
I want to make a relay switch on and off programmatically with my UNO.
Here is my ...
- 101
1
vote
1
answer
148
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I2C communication between load cell and Arduino
I am using Load Cell (FX29 Data Sheet) and Arduino for measuring force. Every time I disconnect and reconnect Arduino from USB I get one of the following readings on serial monitor:
Correct expected ...
- 167
3
votes
2
answers
489
views
UART between TMC2208 and Ardurino : unable to use read from TMC
LT, DR:
I can program the TMC via UART but can't read anything back, and I don't like it :'(
Description
I want to make my ardurino UNO communique with a TMC2208-V3.0 (manual). The use case is to ...
0
votes
1
answer
49
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Heart Rate Monitor, replacing pulse sensor with ECG?
I'm completely new in this area, but I would like to try this project: https://iotdesignpro.com/projects/iot-heart-rate-monitor-project-using-arduino-and-esp8266
The only mismatch is that I have an ...
0
votes
2
answers
59
views
Using PWM with 9 volts
I am trying to power a DC motor for a minifan, and want to be able to control the speed of the motor through PWM. In order for the motor to generate good wind, it needs 9 volts. Since I am using an ...
0
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0
answers
38
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How to Power 2 MG996R Tower Pro Servo
I tried powering a MG996R Tower Pro (180 deg metal gear) servo from an Arduino UNO and ended up hibernating the host PC.
I want to power two such motors (in parallel configuration) for 10 minutes a ...
- 11
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0
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59
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Why is my 4digit 7segment display not showing all segments
My 4digit 7segment display is not showing all of the segments, the image is of it showing 8888. I have never used this display before and it has been lying around for a year or two does anyone know ...
0
votes
1
answer
51
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Powering Arduino with external regulated 5V
I'm planning to create a custom Arduino Uno shield for a test jig I'm making. The shield will have an external regulated 5V source, and I'm looking to use that to power the Arduino. I've read a few ...
- 25
0
votes
1
answer
63
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Programmer is not responding error
I currently am running into problems with my new Arduino board. The complete details are here with log info and other troubleshooting steps https://forum.arduino.cc/t/programmer-is-not-responding-...
- 157
2
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4
answers
340
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An aspiring electriconic engineering hobbyist -- How should I go about this? [closed]
I'm a full-time maintenance technician with no University education (though I did get college credit in highschool for physics and statistics 9 years ago), and I have plenty of interests I want to ...
0
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0
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66
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How to measure frequency of aperiodic signal in simulink when you are getting that signal through arduino?
Actually i want to measure frequency of a signal that i am getting thorugh arduino . I am getting almost correct voltage value near 220V that is value of our national grid and frequency in our ...
- 1,161
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0
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164
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OV7670 camera module (no FIFO chip) configuration with arduino Uno R4 WIFI
a couple of days ago I bought this camera module to use for my project which also does not require a lot of resolution, since I haven't used this camera module before I did google and chat GPT. but ...
2
votes
3
answers
987
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What resistors for a 4 LED Arduino/breadboard project?
I am currently working on a school project for my work-study. The project is super simple: light up 4 LEDs, in various patterns, using a push button to cycle through the modes. I'm using 4 colored ...
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2
votes
1
answer
140
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Why won't my voltage feedback system work?
Vin is a constant DC source. This circuit will take a random DC input between 12.6V and 48V, and then maintain a constant output voltage of 5V using a system of voltage feedback.
with the source code,...
- 288
0
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1
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153
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Why doesn't my buck converter work properly?
Such is my circuit:
Vin is a constant DC source. This circuit will take a random DC input between 12.6V and 48V, and then maintain a constant output voltage of 5V.
At the left bottom corner, there is ...
- 288
0
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1
answer
128
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How do I connect two RFID readers at the same time to my Arduino?
I’m making a simple door lock for my room using an Arduino uno and an RFID sensor, I made the code to unlock the door with the correct tag, but it’s only on one side, I need a way to unlock the door ...
0
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2
answers
66
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Stepper motor for wire winding step calculations
Stepper motor takes 200 steps/revolution without anything attached to the shaft. With a bobbin of 10mm in diameter and 50mm in length attached to stepper motor shaft, does it take the same 200 steps/...
0
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2
answers
942
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How can I read audio output signal (jack) with Arduino?
I am trying to find a way to connect an Arduino board to an USB sound card, equipped with 2 outputs: RCA and headphone jack 6.3mm. I would like to simoultaneously play a sound from one and record the ...
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1
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2
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333
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Why my 12V RGB LED strip controlled by Arduino Uno has reversed colors and when I set RGB to 0,0,0 (after reverse) strip should be black but its red?
This is scheme:
Transistors: BD912, PNP, 15A, 100V, 90W, TO220.
And this is color of "black":
and this is code:
...
- 11
0
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2
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146
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How can I calculate the current induced in the copper coil that is wrapped around a single phase of an 11kV, 2616A distribution line?
Aim: To develop an alert system for power outages in the distribution line, informing electricians of their occurrence.
Working Principal:
Fuse Monitoring: The Arduino measures the status of the power ...
- 11
0
votes
1
answer
118
views
MOSFET trouble with Arduino
I am new to electronics. I have a MOSFET that I'm gonna use to activate a solenoid, but for now I wanted to test it with a resistor. This is my design.
simulate this circuit – Schematic created ...
- 27
5
votes
9
answers
4k
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Can I drive a 5 V relay that requires 22 mA with an Arduino’s 20 mA continuous output?
I need to control a solenoid that requires 120 VAC to actuate. I’m powering an Arduino with a 5V power supply (directly into the 5V pin), and I want to use the Arduino to control a relay that will ...
- 87
0
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0
answers
155
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LCD Display with FPC to Arduino
I’m very new. My game is push button, but it’s important that the display is transparent.
I have this LCD screen. (data sheet) I was going to connect it to my uno using this PCB. But it didn’t fit ...
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3
votes
1
answer
309
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Need help to understand an Arduino Capacitance-Meter program
There is a program for Arduino that without using any external component, measures value of an unknown capacitor in the range of 470pF to 18pF:
https://www.circuitbasics.com/how-to-make-an-arduino-...
- 73
1
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1
answer
219
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How to connecting two ADXL345 (GY-291 modules) to one Arduino UNO R3 by using pin jumper?
I am having some trouble in connecting two independent ADXL345 (GY-291 modules) to my one Arduino UNO R3. Before this I tried using one ADXL345 and it works perfectly, but in my project I need to use ...
- 11
0
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1
answer
269
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Connecting Raspberry Pi UART to Arduino Uno
AFAIK the RPi uses 3.3 V logic and the Uno uses 5 V logic.
So I need a level shifter to convert the logic levels.
I have purchased a bi-directional level shifter.
I want to check if I have wired it ...
- 3,373
0
votes
1
answer
69
views
74HC595 used with Arduino gives high value only on first pin
I am using a 74HC595 shift register IC connected to my Arduino board as described in this tutorial to drive 8 RGB LEDs. The code is given below and is similar to the one in the tutorial:
...
0
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2
answers
227
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Powering Arduino from 12 V
I’m making an automatic dog feeder with an Arduino Uno as the brains and a stepper motor (taking 12 V, hence the need for the 12 V power supply) as the muscles. I want to power the whole unit from a ...
- 101
1
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1
answer
2k
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Does ESP32 Wroom-32 have internal EEPROM?
I'm working with ESP32 Wroom-32 and AHT25 temperature and humidity sensors. I need to store the temperature and humidity data using EEPROM.
I don't think ESP32 has internal EEPROM. If not means how ...
- 71
0
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0
answers
69
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Inverting Arduino reset signal
I'm designing a general-purpose PCB for a 8051-family MCU. I make it compatible to use shields for the Arduino Uno. There is a snag with the reset circuitry, as an Arduino is active-low reset and the ...
- 199
0
votes
2
answers
458
views
How to connect a 4x4 matrix keypad to one analog pin?
I watched this video on YouTube, the video's creator shows how we can connect a keypad to just one single analog pin of Arduino UNO instead of using (number of columns + number of rows) pins by using ...
- 53
0
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4
answers
158
views
How to give small voltage signal to Arduino?
I have a device which audibly says a specific line, let's say it says "received payment of $5," and the device has a speaker connected. Now I want when it says this line, my Arduino should ...
0
votes
2
answers
815
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Understanding how the input pins on my Arduino Uno read voltage
I recently bought an Arduino starter kit which comes with an Arduino Uno and some components. I know very little about electronics or physics. The Arduino has some analog-to-digital pins on it which ...
- 153
0
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2
answers
413
views
RS485 not working
I want to send data between different Arduinos distributed in different places:
Something like this: https://forum.arduino.cc/t/arduino-master-slave-communication-using-rs485-and-modbus-protocol/...
user337746
0
votes
1
answer
519
views
My lower side MOSFET in my half bridge SPWM inverter keeps getting shorted
I am designing a single phase SPWM inverter as a project. I am using IRF740 as MOSFETs (all N channels.) My low side MOSFET keeps getting shorted.
I have checked through DSO - there is no cross ...
8
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5
answers
2k
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MOSFET overheating in Arduino heating pad project
I am very new to electronics and working with Arduinos, I am learning a lot and would appreciate any help.
I am making a heating pad system for a high-altitude weather balloon science experiment. The ...
1
vote
0
answers
104
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Not being able to write&read data from the 24C04N EEPROM using I2C
I have connected the 24C04N EEPROM to the ATmega328p like this -
Image source - Google
The only difference is I connected the ATmega328p on a breadboard using FTDI like this -
Image source - This is ...
- 45
0
votes
2
answers
171
views
Can I capture keypad values with an analog pin?
I am building a calculator with an Arduino Uno. The thing is I ran out of pins. The switch membrane has 4 rows and 4 columns resulting in 8 pins it doesn't fit. That is why I plan to do a shift ...
- 3
0
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2
answers
372
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How does an Arduino actually read a high signal on a pin?
I have made circuit where you can see that it is reading some signal from a button.
I've found in Arduino tutorials that there should be a pull-down resistor, which I don't really understand well.
I'...
- 101
2
votes
1
answer
216
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GP2Y0A21YK0F Sharp IR sensor not counting below a certain distance threshold
I'm building a self-navigating robot that uses IR sensor (GP2Y0A21YK0F model) with Arduino to navigate through a terrain, however during testing phase when I put my hand closer than 7cm it bugs and ...
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0
votes
1
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438
views
I need help uploading scripts to an ESP01 through an Arduino UNO
I am a beginner with Arduino. I am trying to upload any basic script from my PC to an ESP01 through an Arduino UNO and Arduino IDE.
The code I am trying to upload is very basic:
...
- 1
7
votes
9
answers
3k
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How can I connect multiple potentiometers (~20) to my Arduino without having to have 20 analogue pins?
I'm trying to build a MIDI controller and I'm looking for a clever way of using 20 potentiometers without having to have 20 analogue ports on the Arduino. So far all the functionality I need is for ...
1
vote
0
answers
128
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Coding Help: Blender to Arduino over Serial Port
Working on a connecting an Arduino Uno to Blender 3.4 over the serial port. In the Blender file, I have an object named "motor1", a simple cube that can be manually rotated in the 3d ...
- 11
0
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1
answer
169
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Why is my arduino digital signal flickering on my oscilloscope display?
I have a very simple arduino program:
...
- 1,204
0
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1
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80
views
Using a voltage divider to measure output of generator, and use an Arduino to measure wind speed
I am currently part of a group project in which we are required to build a turbine and generator that will turn on a light at a wind speed of 10 m/s.
How will I use the fluctuating voltage out of the ...
2
votes
1
answer
181
views
How to properly measure a 200 A/5 A CT using an Arduino?
I've seen multiple projects for energy monitoring explaining how to calculate values using a Current Transformer (CT), however, all the CTs that were mentioned have high turn ratios.
The CT available ...
Kristofer