Questions tagged [arduino]

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19 views

Possible over-current issue in Arduino transistor circuit?

I have made the circuit illustrated below. It uses a Sparkfun ProMicro to turn a pump on and off based on the signal from an Adafruit light sensor. I am using a signal from the ProMicro to the 2n2222 ...
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12 views

How to use AT commands on Proteus while Bluetooth module being interfaced with Arduino UNO

How do I use AT commands on Proteus when HC-05 is interfaced with Arduino UNO ?
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1answer
29 views

Arduino Mega 2560 USB died due to short circuit

I have found some Arduino tutorials where the voltage regulator died on board: https://www.instructables.com/id/Fix-a-fried-Arduino-Mega/ However this is not the case for my Arduino Mega 2560. The ...
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1answer
54 views

What diode to use in keyboard matrix PCB?

I'm making a project where I redesign my old calculators PCB, so I could read the button presses with an arduino. The general design is done, all that's left is to decide on which diode is going to be ...
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0answers
25 views

UART Multidrop - Arduino - Return TX to master

Suppose that i have 1 ESP32 as Serial RS232 Master and 30 Arduinos slaves connected with crossed RX-TX each other. Note: i can't use for any reason RS485/422 protocol, i need a simple (and cost ...
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2answers
137 views

Where to connect GND on keyboard multiplexer circuit?

Hi all, I'm making a project to read my old calculator's keyboard with an arduino and I've decided to design a new PCB and change it with the original one, as it's easier than trying to hook into the ...
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0answers
18 views

Sequential access of 1-Wire devices

I need to access sequentially 64 1-wire devices by indexing them, this because i need to know the exact position of those single devices (for example, the DS2401 on position 25 has 000xFFF456 serial). ...
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0answers
19 views

Unsure of PWM frequency for HobbyWing Platinum-60A Brushless ESC

I want to program this ESC HobbyWing Platinum-60A Brushless ESC (Manual) I want to first try it using Arduino's Servo Library and then using STM32F4. From its manual: It says that it requires PWM ...
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0answers
47 views

Arduino-12V Pump losing power

I'm creating a automated watering system using a Arduino. I'm using a 12V peristaltic pump to pump the water. The Arduino is connected to a phone charger (230VAC to 5VDC). For the 12V source, I'm ...
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32 views

How to pass a changing value to a graphic display using Arduino? [migrated]

I am using an EA DOGM132-5 graphic display, they also have provided a library for Arduino, so everything is nice and easy. The library has a function for easily passing a string to the LCD. ...
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2answers
48 views

Using a slider potentiometer with an Arduino

I'm new to electronics and in the process of building a Joystick using an Arduino Leonardo. I am reusing parts from an old Joystick from the 90s https://www.amazon.com/F-15E-HAWK-Tactical-Control-...
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1answer
83 views

4-20mA output from Arduino Nano

To convert 1-5V to 0-20mA: When I use 3.3V ouput from Arduino Nano Power Pin--> Iout = 13mA (which is ok). Similarly, with 3.3V Battery -> Iout = 13mA (which is ok). But, when I use 3.3V ouput ...
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4answers
79 views

Recording bioelectrical activity in plants- will this circuit work- any advice on sensors?

I am a visual art student and I'm currently developing a project which involves recording bioelectrical activity in plants. I am totally new to this game so I’m just wondering if anyone can have a ...
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0answers
25 views

Feedback on Schematic and Board Design (Following Prior Feedback, Includes BOM)

Table of Content: Purpose of the Project Schematic "Guide" Schematic Board Questions Purpose of the Project: Firstly, thank you so very much for reading this. The general goal of this project is ...
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1answer
80 views

ATX PSU turns itself off when uploading sketch to Arduino

I'm trying to power a stepper motor with the 5V rail of an ATX PSU and control it using arduino. To keep the PSU running, I have shorted the PS_ON pin to ground. ...
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2answers
36 views

What board should I use to control my 3D printer

I'm trying to build a simple experimental FDM 3D printer as a hobby. As I said it's a simple printer with only basic functionalities such as receiving the slicer file to print from a slicer software ...
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2answers
45 views

What options exist for a for low-latency (<1ms) photosensor?

I'm wanting to build a computer keyboard-to-display lag measuring tool using an Ardunio: User places the photosensor right-up to their computer monitor. User presses a button on the Ardunio. The ...
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0answers
20 views

Mega2560 no response from serial after replacing 5v voltage regulator

The voltage regulator failed on my Mega2560 (using 12v supply, was seeing 12v on input and 3v on output). I replaced the component and the code runs fine but I can no longer communicate by serial over ...
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0answers
24 views

How to install Arduino Driver, if it is not discovered by pc(Win10)?

I bought an Arduino Uno on amazon, and when I connect it to my pc it is not discovered by the pc. Even if I use hdwwiz and install the driver, it says that the ...
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0answers
20 views

5 wire, Logic Output Photointerupter/Slotted Optical Switch

I am trying to get a digital output from a 5 wire photointerupter. The p/n is OPB903w55z, it is configured as an inverted open collector. I have used 4 terminal transistor output photointerupters ...
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0answers
22 views

LED driver - current monitoring AC or DC side with Arduino

I have 2 LED strips connected in parallel to the same LED driver (driver is constant current + constant voltage). I have got an Arduino controlling a relay module that switches the lights on or off (...
0
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1answer
51 views

Steering wheel controls with zener diode?

I am looking at my steering wheel schematics and trying to find what are these zener diode doing there? I want to be sure there's no problem feeding 5V from an Arduino to check the ADC values without ...
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0answers
26 views

How to design a multiplexed keyboard circuit for Arduino?

Hi all, I'm working on a project where I'm trying to read my calculators keyboard to know which key was pressed. I've decided over the past few days that hooking into the calculators PCB wasn't ...
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0answers
43 views

Ask about Opto 6N137 [closed]

I want ask something about opto 6N137. i have two 6N137 1 is Vout = +0,2V 2 is Vout = +1,3V which is working ?? Did I kill it? Or I did sth wrong? I have attached schematic for the same
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0answers
26 views

How would I control a non-individually addressable RGB led strip with an Arduino, an android phone and bluetooth [closed]

I want to control my non-individually addressable RGB lights with an Arduino, Android phone, and Bluetooth. My goal is to be able to create cool effects like lights that are reactive to the music. I ...
1
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1answer
31 views

Cannot connect Arduino Uno REV3 ATmega16u2 serial connection to outside serial connection

I wanted to simply use the ATmega16u2 on my official Arduino Uno with a serial connection. I connected my Serial Board (where I can simply connect any serial connection and read it on my PC via Putty)...
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3answers
64 views

How to automatically disconnect from battery when USB +5v is present

I'm creating a SMD PCB where space is extremely limited. Usually, the application is powered by a battery (Single cell 3.7v lipo). To charge the battery, I'm using a USB cable. What I'd like is for ...
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0answers
14 views

Which pins of ATSAMD51 are used for I2C in Adafruit Grand Central?

I am trying to recycle my old Adafruit Grand Central board to use with Atmel Studio.I Adafruit website , I2C pins ( SDA , SCL ) are marked as PB20 and PB21 to be used as SERCOM-3 but in ADSAMD51 ...
0
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1answer
61 views

How to decide which key was pressed on a calculator?

Hi all, I'm trying have an arduino read key presses on my calculator. The calculator does it by pressing the keyboard membrane to the PCB and connecting two points, so each key has two of these ...
2
votes
1answer
54 views

Do I need a diode to protect my ESP32 from a connected relay?

My ESP32 is controlling a relay which I switch on for 500ms (controlled through the internet). Do I need a diode to protect my ESP32 from voltage spikes when the magnetic flux collapses? I'm using ...
0
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3answers
71 views

Arduino frequency measurement to 2 or 3 decimal places

I am in the process of building a Proton Precession Magnetometer to calculate the earths magnetic field strength by measuring the precession frequency of protons in distilled water. I am using an ...
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0answers
52 views

Attaching sensors to PCB to minimize space

In my electronic product design project I need to come up with a completely finished product that can be presented in the market.What i'm designing is a turbidity meter with Arduino components with ...
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1answer
91 views

Using directly Arduino pins, can the Arduino deliver the current needed to trigger 4 or 5 optoisolators (moc3023) at the same time?

I'm using an ATmega328P to contol 4 optoisolators via 2n3904 transistors. It works perfectly. I want to eliminate the transistors if the Arduino can deliver the needed current to control them. **...
0
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1answer
22 views

Options for passive long range sensors

What I'd want to do is to use cheap disposable temperature sensors and to read the temperature data wirelessly. The sensors would be set in a medium such as reinforced concrete. Right now I'm using ...
0
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1answer
34 views

How to detect a magnetic field from a distance?

I want to detect a magnetic field, like those of small neodymium magnets, from at least 6 inches away (the further the better, I'd like at least a foot but I won't ask for too much). I'd like to do ...
0
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1answer
24 views

4-20ma 3 wire linear transducer and arduino connection problem [closed]

I am trying to connect a 24 volt 4-20ma 3 wire resistive linear transducer to arduino with 4-20ma to 0-5 volt converter (https://www.amazon.com/Isolation-Current-Transmitter-Converter-Transformer/dp/...
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0answers
36 views

Solar Li-Ion Charging with load-sharing

I need some help regarding my project. I have made a dog feeder with Arduino Uno, which is powered with a 3000mAh Li-Ion battery. I want the system to be charged with a solar panel (more solar panels ...
0
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1answer
18 views

Arduino RGB ledstrip control 2 separate power supplies

Please ignore the 2 green and orange lines in the middle and consider the transistors to be IRF mosfets instead. First of all looking at the setup on the picture: is there any issues with using 2 ...
0
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2answers
161 views

LCD 16x2 Showing no text

I an trying to connect a 16x2 LCD text module with Arduino and it continuously shows only the green backlight. My code is correct and my connections are also correct. I tried the same project on ...
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0answers
31 views

Interfacing DE10 FPGA and arduino

Is there a way to connect DE10 lite FPGA board and Arduino UNO without an arduino shield? I want to test my UART module that I created on my FPGA board and was thinking of making it talk to my Arduino ...
1
vote
1answer
36 views

How To Read Serial Data From The Neurosky Chips

I recently bought a Star Wars Force Trainer II with the intention of using it to read the attention and meditation values. I looked at the Arduino brain library but that didn't work. I started reading ...
2
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3answers
78 views

Daisy chaining ground to buttons

I am building a small controller box based on an Arduino or similar MCU board. There are upto 6 buttons on the controller. In regards to ground, can I daisy chain the ground round all switches? ...
0
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1answer
34 views

Project containing different components with audio problems

I am creating a project where I have a speaker that starts playing music as soon as movement is detected. When movement is detected a ledstrip also turns on to illuminate the room. The project ...
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0answers
33 views

How does projectx arcade game works? [closed]

This is the video of the game. Video of the game I think it sends infrared light and it is received by the photodiode when it is reflected by the light on the wall. But I'm not pretty sure. I wanna ...
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0answers
34 views

How to measurement dynamic weight 0.3 Kg to 20 Kg, 1% accuracy

my problem is: I want to make a dynamic measure of weight that can handle a range of scales between 0.3-20 Kg while we keep of accuracy at least 1% [in case of 0.3Kg - 3 grams]. Equipment: Arduino Uno ...
0
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2answers
35 views

Using digital pins for reading analog value

When I connect the pressure sensor to an analog pin of WEMOS D1 MINI board I'm getting values between 300 when the sensor is not pressed, and 700 when it is pressed....
1
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1answer
58 views

How to combat voltage drop on a 5v addressable led strip

I've been trying to make my LED strip work but with no success. It is a 5 meter WS2812B RGB LED strip (60 LED's per meter). I did some research and it turns out that one LED draws around 60mA at full ...
0
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0answers
35 views

RTC not Responding

I'm using a MCP7940 with a Atmega328P on a custom board. I'm using the Arduino Wire library. When I first start communication to write the time to the registers, things seem to work fine but then in ...
1
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2answers
59 views

Designing a Arduino based circuit to power standard and RGB LEDs

I am very new to the world of circuit design and would greatly appreciate some feedback on this circuit I made. It is based on an Arduino Pro Mini and its purpose is to illuminate nine 2V, 20mA LEDs ...
0
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1answer
45 views

Solar tracking using an Arduino Uno

I'm trying to design a dual axis solar tracker using an Arduino Uno-R3. Basically it just takes the input from the LDR and outputs the PWM signal to the two 9g servo motors for each axis. The ...

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