Questions tagged [arduino]

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31 views

Is there a way to know which magnet pole is facing the circuit?

I am not that much into magnetism, but I am facing the problem of defining the pole of the closest outer magnet it faces the circuit with. The magnet is completely out of control and might as well ...
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19 views

Providing power to NodeMCU (ESP 8266) from 5V output of an Arduino

Is it possible to power a NodeMCU from 5V output of an Arduino UNO board? I was trying to use the Vin of the NodeMCU as the input from the 5V port of the Arduino. It didn't work. Could anybody please ...
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1answer
30 views

What type of hall effect sensor do I need?

I have this gear (image attached) that I'm putting over a metal shaft and I want to measure its rpm from 800-15,000 rpm with a tolerance of +/-10 rpm. I'm thinking I can do this using a hall effect ...
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18 views

Need Help Connecting Arduino to PC via RS485 with Max485 breakout board

I am currently attempting to connect an arduino to a PC via the RS485 communication protocol using a max485 to convert the RS485 to serial. It does not however appear to be receiving any data at all. ...
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21 views

Arduino Load Cell Limitations

I came across this forum in my research on load cells for a project at work. I had order the load cell and an amplifier/display but turns out there's no way for the display to show lbs it only shows ...
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1answer
21 views

Does this L298N H-bridge produce a PWM signal or a steady voltage as its output?

I am wondering if these l298 h-bridge packages produce an amplification of the PWM received from the micro-controller, or if they produce a fixed voltage. let's say I was viewing the output signal on ...
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36 views

adding music to my smart car [closed]

so I want to add music to my expansion board since the Arduino is connected below that. The question is what materials do I need to make music that's on a micro sd card?
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57 views

Why do Arduino PCBs not use the FT230XS? [closed]

I wonder why many Arduino PCBs (both official and unofficial boards) use the FT232R instead of the FT230X, since the FT230X is cheaper, works just as well for bootloader burning, and can support up to ...
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2answers
32 views

LED_BUILTIN output is not working on NodeMCU ESP8266

I have a new NodeMCU ESP8266. I made sure that the builtin LED on it was working properly by uploading the "Blink" example sketch from the Arduino IDE examples and it worked. When I try my ...
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1answer
43 views

Overheating Arduino Nano: decoupling capacitor advice

I've put together a circuit to control two LEDS (datasheet) with two Picobuck LED drivers (product page, datasheet) controlled by an Arduino Nano clone. I'm powering the Picobucks with a 12V 5A power ...
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2answers
65 views

Custom Drone not lifting off and few other problems [closed]

General description I am trying to make a drone but with all the circuits and code from scratch. Its arduino based and is communicating with the controller with nrf24lo1 modules, it also has a ...
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39 views

How to receive UART0 data using UART0 Received interrupt in ESP32 with Arduino IDE code

I want to receive UART0 data of ESP32 using UART0 Received Interrupt using Arduino IDE. There have arduino Library to receive UART data like: ...
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3answers
76 views

Microcontroller- Run program directly off external EEPROM

I am working on a project, and for it I need to run a microcontroller program off of an EEPROM. I know I can set it up with an Arduino to load the program into internal memory and run it from there, ...
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1answer
62 views

Servo shutoff using a MOSFET

I am trying to design a circuit to cut the power to a servo to prevent the servo from overheating on the occasional circumstance that it stalls. The servo can draw almost 4A at 7.5V on stalling and ...
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50 views

What steps one should follow to convert an Arduino code to PIC MCU?

For my project, I'm using some Arduino library code. I need to translate the code for PIC MCU and I'll use MPLAB IDE. I want to know what should be my working steps to perform the task? I have some ...
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1answer
53 views

WIZnet W5500 arduino connection

I am trying to make PCB with arduino and w5500 . I am looking example schematics. I didn't understand one thing. Normally I am connecting with 7 pin like this but when I look the example schematic ...
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60 views

Controlling 12 V solenoid valve via Arduino

I have a solenoid valve that is to be controlled via 0..330 mA proportional control @ 12 V. I imagine the right way to control it is to modulate the solenoid voltage between 0-12 Volts and the change ...
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1answer
40 views

16 high frequency ~4khz or more pwm ESP8266

I do colorful led light near my table. I have 5 common anode led rgb strips, glued to a different places. I'm trying to develop my own rgb controller based on ESP8266, with WIFI and USB, and met a ...
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48 views

I want to make a tachometer that uses CDI (capacitor discharge ignition) signals to measure RPM. How can I measure the high voltage with an Arduino?

I have a Chinese unbranded ~ 50cc chainsaw engine. I tried numerous times to use it to power a bike but in vain. I found online that the RPM is very high - around 10k RPM. I decided to do it right by ...
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22 views

Understanding the SAM ARM static memory controller and mapping

I've been reading the datasheet for the SAM3X chip used on the Arduino DUE to explore and learn more about the static memory controller. The reason I want to learn this is because I'm looking to build ...
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0answers
29 views

Accurate weight sensor for home kitchen scale [closed]

I'm building a "smart" home kitchen for my home that will be integrated with my home automation system. Fo that I want a weight sensor that will be both very accurate and also thin. I found ...
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0answers
26 views

How to use Arduino to interpret UART signal from e-scooter [closed]

I'm currently working on modifying my E-scooter. I intend on building a bigger battery using 18650's and replacing the crap speed controller in it... But I would like to keep the original Dashboard as ...
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0answers
27 views

Upload problem on custom made Arduino Mega2560 rebuild

I designed my own PCB to control a couple of motors, to monitor positions by means of light barriers, as well as via UART with to chat with a barcode scanner and a GSM module. Since I first made a ...
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0answers
19 views

Issues with Arduino datalogger freezing

I'm trying to build a datalogger using the following components: DS3231 SD Micro SD Module AHT10 LM35 Just a little context. I noticed that when connected to my notebook usb port, the data was saved ...
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2answers
129 views

How to fix voltage divider that drops more voltage than expected? [closed]

I'm not sure if I stated the question correctly, but here are some details. I want to hack Ikea smoke sensor that has a controller designated as CS2105GO-S12 (also known as MC145010). It has aa T4 ...
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1answer
74 views

generate encoder signal without using delay

I'm looking to emulate an encoder signal using an Arduino microcontroller (Seeed Xiao, SAMD21 Cortex M0+). The following works but locks up the main thread with delays. The frequency of pulses isn't ...
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1answer
63 views

How to achieve high speed microstepping?

I used an Arduino Uno with A4988 driver with 1/16 microstepping and tried to achive the highest speed possible. Using AccelStepper library ...
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0answers
72 views

How to measure current as low as 0.1 mA via Arduino

I would like to measure currents in the 0.1-1.0 mA range and read the data into an Arduino. I see there are a good amount of ammeter boards available, but I am wondering if they can measure this fine ...
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2answers
67 views

I don't know what voltage to use for my Arduino Uno

Specifications: It's a 100% Arduino pro micro Compatible Board. Chip: ATmega32u4 Board Mode: LEDNARDO R3 Operating frequency: 16MHz Working voltage: 5V Input voltage: 7-12V Digital IO port: 20 PWM ...
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0answers
52 views

Connect 6 UV-C Luminus LEDs to an Arduino UNO [closed]

I am not an electrician but I wish to connect 6 UV-C Luminus LEDs to an Arduino UNO. Is it possible? How can I control them? I only notice that they have + and -. A scheme how to do it will be of ...
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2answers
57 views

Square wave frequency upsample with crystal oscillator

I'm trying to accomplish the following without the use of a microcontroller: Input: A square wave with a 1 Hz period, duty-cycle of 100 ms (10%), normally low. Output: A square wave with a 100 Hz ...
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46 views

Would it be possible to replace the atmega328p on the Arduino Nano with an atmega324p?

I have an atmega324p and was wondering if I could attach it to my Arduino nano by removing its atmega328p. If I cannot due to pin layout, would it be possible to make my own PCB of an Arduino nano ...
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2answers
67 views

Can I measure vibrations with an IMU that has lower frequency than the vibrating object?

I’m using Arduino 33 Sense IMU to measure vibrations and I have tweaked it up to about 400Hz. However, the object (motor) I’m measuring can have a vibration frequency of up to 10kHz. My question is; ...
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5answers
75 views

Combining two antenna at a right angle to get a better signal?

I got two of these: https://www.amazon.com/dp/B01KH3VEGS But I only need one at the moment so I thought I could combine the two antenna to get a better signal in this manner (90 degrees to each other):...
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1answer
44 views

ESP32 Devkit V1 blown USB

My new oscilloscope arrived today and thought I'd play around with the ESP32 to see what signals I could get out of it. Unfortunately, being a cack handed imbecile, I think I shorted GND to Vin (or ...
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2answers
82 views

Split core vs. ring ferrite

I have an Arduino clone with L298P motor driver, which drives a linear actuator with a brushed DC motor and a built-in end of stroke mechanical switches and diodes. Motor runs at about 12V/2A DC, on/...
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1answer
66 views

Programming ATMEGA328P with an USB-UART adapter

I'm having trouble using this USB to serial converter to program my ATMEGA328P. Let me show my steps below: I have bootloaded the ATMega328 using the Arduino as an ISP. I then used the Arduino as an ...
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0answers
28 views

Landline interface to analog 4+n door phone

I'm trying to build an interface between an old "4+n" (multi-language manual, power supply) analog door phone and the landline. I'm hoping to detect the ringing status of either the door ...
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1answer
53 views

Filters for potentiometer potentially causing issues with ADC

I am sampling potentiometers on an Arduino Zero using the SAMD21 microcontroller. Listed on the SAMD21 datasheet the ADC input is 3.5 kiloohms of impedance. On my setup I am using a low pass filter by ...
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1answer
46 views

ATMEGA328P RX/TX lines need to be connected for properly function with Arduino code?

I'm using ATMEGA328P implement on a miniPCB to control the Raspberry Pi Start and control LED Status. The code works fine when ATMEGA328P is plugged on Arduino UNO board, but on the PCB, on the first ...
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0answers
60 views

Operational amplifier output to both oscilloscope and Arduino analog input [closed]

I am looking for a solution to get sensor analog output to both an oscilloscope and/or an Arduino analog (A0) input or maybe ADC. Here is what I think it could look like: simulate this circuit –...
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2answers
47 views

ESP-12E circuit problem

I am trying to use an ESP-12E module to detect a voltage & drive a MOSFET and LED. My schematic is attached. I am having trouble getting this on and after checking it several times, I can't ...
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1answer
30 views

Connecting photoelectric sensor to Arduino for distance measurement

I've purchased some of these sensors"S15-PA-2-A00-NK" and I would like to use them as distance sensors to be read by an Arduino. I have no idea what type of signal the sensor even outputs or ...
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0answers
23 views

Is there a way to repurpose the RDM6300 (125 kHz) to 134.2 kHz? (ISO 11784/85)

I recently bought an RDM6300 (125 kHz) in order to build a DIY animal tag reader. Upon further reading and failed arduino tests I realized the animal (cattle) tags work within a specific frequency of ...
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0answers
67 views

Why is the voltage across high impedance indeterminate?

The analog pins on my Arduino read sporadic values when unconnected, and my multimeter (set to VDC) shows random values when there's no connection between the probes. If I connect the analog pins on ...
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1answer
43 views

Low Pass Filter for Arduino +5V Pin

How can I find the resistor and capacitor values for a low-pass filter applied to the +5V output pin of an Arduino Uno? I'd like to reduce the noise as much as possible and get a clean, steady +5V ...
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2answers
67 views

Arduino + ADS1115 + 10k pot noise

I am trying to make Arduino work in conjunction with 16-bit ADS1115 ADC and generic 10k potentiometer. However I noticed that there is some serious noise and values are way too inconsistent. Here is ...
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2answers
65 views

Does the Arduino Capacitive Sensing Library fully charge/discharge the "capacitor"?

I'm currently trying to figure out how the Arduino Capacitive Sensing Library works. There is already a similar, but more general question: How does the Arduino CapSense library work? The answers ...
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0answers
59 views

5V Voltage Regulation from Arduino

A question about using the +5V supply pin from Arduino devices such as the Uno. Supplying my system (consists of sensors, ADCs, and opamps) using only this +5V supply pin, I'd like to regulate this ...
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1answer
40 views

Pull-up resistors needed between DS3231 and AHT10?

I'm trying to create a datalogger using DS3231, AHT10, ESP-01 and MicroSD Module. So far I noticed that the AHT10 is returning wrong fixed readings: -50 for temperature and 0 for humidity. When tested ...

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