Questions tagged [arduino]

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STM32F103C interfacing with TF Card Module

I have an stm32f103c8t6 board. Recently I got a tf card module and I tested out with arduino nano. It worked fine. Then I tried to use the module with my stm32 board. Unfortunately It did not work. ...
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19 views

LIN bus sniffing with Arduino

I'm trying to do a simple LIN bus sniffing in my car with an Arduino. This should be possible with a simple voltage divider if I'm not wrong. Would this schematic work? ...
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26 views

Binary Manipulation in arduino with 74HC595

I'm doing practice of bit manipulation in arduino with a 74HC595 shift register. I would like to create an algorithm that allows the binary digit to perform this way: 1 0 0 0 0 0 0 1 0 1 0 0 0 0 1 0 ...
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31 views

Interfacing STM32F103C8T6 Board with tf card module in Arduino IDE [closed]

I have an stm32f103c8t6 board and recently got a tf card module. I tested out the module with my arduino nano and it worked fine. Then I tried to use with the stm32 board by uploading the same code ...
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1answer
25 views

Esp8266-01 module attached to Arduino resets when DC motor runs

Machifit JT80SL DC 3-6V Water Pump: 3-6v Servo sg90: 3-7.2v Esp 8266 01: 3.3v I have 2 Arduino Uno both has their own ac-dc power adapter. Lets say, 1st Arduino ...
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1answer
68 views

Controlling multiple stepper motors using a single driver

I want to control ~50 stepper motors using a single driver, and use only one Arduino pin to control each motor. Currently I'm using a single A4988 driver and a couple of 12v 1amp stepper motors to ...
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1answer
28 views

How would my circuit vary if my DS18B20 comes on a 'Keyes' module?

I am looking at the following tutorial on how to link the DS18B20 to an esp32 module: https://randomnerdtutorials.com/esp32-ds18b20-temperature-arduino-ide/ For the parasite mode, I have the ...
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1answer
46 views

Wireless RGB led controller circuit with motion sensing - design feedback

Beginner hobbyist here. I would appreciate some design feedback. Purpose of this circuit: It controls an RGB LED strip (5 Meters, SMD 5050) via an IR remote and also automatically powers on/off the ...
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2answers
59 views

Why one stepper motor is twice faster?

I am using some stepper motors and I realized they are much slower than the stepper motors of OpenBuilds (http://youtu.be/GrjqW2MDCvM?t=3744). They're using less teeth on pulley too. Power supply ...
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48 views

Why stepper motor is slow with A4988 driver?

I'm using NEMA17 17HS13-0404S1 stepper motors with Arduino CNC Shield & A4988 drivers but I think they're much slower than they should be. Hard to explain how slow they are but compared to Ender 3 ...
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1answer
56 views

Powering an L298N's IC and an Arduino Uno R3 using an LM7805

Before i start i would just like to say that i am an absolute beginner at this, and this question might be a little silly. I'm trying to make a shield that'll go on top of an arduino uno. The shield ...
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1answer
53 views

Optocoupler conducts without LED supply

I'm a beginner in electronics. I am trying to use an optocupler (p621) to switch 12v supply to 5v for digital input. Here is the fritzing diagram So from the 12v supply I am using 1 1k resistor into ...
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1answer
35 views

What happens: n Hall effect sensors wired in parallel, < n of them is triggered?

This is almost certainly a noob-level question. I only have one Hall effect sensor to play around with so I can't test this out for myself. Say I have multiple Hall effect sensors wired like this, ...
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1answer
32 views

Is it possible to use two HM-10 on two Arduinos for bidirectional Bluetooth communication?

I am thinking about using the HM-10, or some other bluetooth module on two Arduino boards for Bluetooth communication. What I want is to be able to send and recieve data from a single Arduino board. ...
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1answer
29 views

Arduino RFID Multiplexer Antennas

I want to make a electronic chessboard that detects the position of every piece on the chessboard. Every chess piece will have RFID tag. My idea will be to have 2 multiplexers(1*8) one for the rows ...
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33 views

Using an unknown CLK output to pulse two LEDs

I am trying to modify a preexisting imaging setup. The setup I have relies on an excitation LED to excite a fluorescing material which will then be captured on a camera. The already existing setup has ...
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39 views

Fix burnt USB port [closed]

I accidentally connected the 5V output of my arduino UNO with a 12V power adapter (I wanted to use a transistor as a switch for turning on some fans and touched the breadboard line). Unfortunately, ...
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26 views

Wire.endTransmission(); have trouble ending

I am trying to read data from an INA219. To save some memory, I looked at the .cpp file from Adafruit_INA219 library: (Adafruit basically used their function wireWriteRegister(0x05,cal);) ...
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1answer
108 views

Not debouncing on a MIDI keyboard

I am modifying an old 90s keyboard (CTK-450 by CASIO) to make it a MIDI controller. I'm going for an Arduino that goes over the matrix layout of the keyboard. The issue I have is with debouncing. ...
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2answers
76 views

How to drive an AD9850 at 100 kHz/s sweep using arduino or rasberry pi?

The basic problem I am interested in doing is using an ADXXX chip to make a linear frequency sweep through the HF bands, from 1-20 MHz. The sweep rate I would like to achieve is 100 kHz/s, which ...
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2answers
59 views

Optocoupler with Arduino

I'm trying to input 12v into Ardunio Digital inputs. But since Arduino digital input max voltage is 5v, I would like to use an optocoupler as a switch for 12v input into 5v from Arduino itself. So I ...
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2answers
57 views

How to wire 0.91/0.86 inch display to i2c?

I have a 0.91 inch display with a 4 pin I2C connection. I then realised that I needed to use a 0.86 inch display with the connector in the above image. I have searched on google on this but nothing ...
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2answers
59 views

Working principle of a MOSFET Transistor

I was just reading a blog entry regarding the power conflict of the Arduino and trying to understand everything, when I came to a point where I could not understand the working principle of the ...
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75 views

How to properly connect IR photodiode

I encountered some problems with the signal from photodiode and don't know how to connect it effectively. Datasheet can be found here: https://www.marktechopto.com/pdf/products/datasheet/MTPD1346D-...
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1answer
52 views

Is this a valid matrix circuit, I've drawn it based on guides and examples online

I'm trying to build a matrix of 6 toggle switches 6 momentary buttons 4 rotary encoders I'm going to use a Pro Micro board and I'm wondering if my wiring looks okay, this is my first real ...
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29 views

Failed to connect to ESP8266: Timed out waiting for packet header

I'm trying to program ESP8266 Node MCU v0.9 using Arduino IDE. I'm trying to upload the most common sketch i.e. blink which is available in the examples of ESP8266. Even then I'm getting this error - ...
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1answer
55 views

Chaining 25 74HC595 shift registers together

Situation: I am doing a project which requires me to chain 25 74HC595 shift registers together. They ate controlled by an Arduino microcontroller. Question: Will it work when chaining that number ...
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2answers
64 views

Finding value of resistor between two diodes

I'm using an Arduino and I have the following circuit: I couldn't find the symbol for analog signal, so the voltmeter represents a connection to the Arduino's analog input pin. How can I work out ...
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23 views

Whats the difference in these 2 input filter dampers?

Hi Im designing input filter for tps54202, with input 12V, output 3.3V at 0.5A. To pass emission test I need input filter, L+C should be good for that, but Ive read that its good to add damper to get ...
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3answers
91 views

How to choose R and C to reduce noise on analog input of arduino?

I'm not terribly proficient when it comes to hardware, so please bear with me. I've tried to google around to figure out how to choose values for a low pass filter to reduce noise on a potentiometer. ...
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1answer
71 views

3D hologram fan display

Did not know where else to ask about this, so if it is off-topic I would gladly take some pointers as to where the correct place would be. I would like to make one of those spinning LED fans that can ...
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1answer
11 views

Functioning Problem In Accelerometer

Hello I have used ADXL335 Accelerometer in a gesture controlled project but I have powerd by 5v output from Arduino Lilypad, so it started creating mess by giving wrong outputs. Afterward I came to ...
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29 views

Adafruit eInk Display and ESP32 Huzzah

I have an ESP32 Huzzah board from Adafruit and am trying to control a 2.19" flexible eInk display to no avail. While the screen occasionally updates, the full black and white "clear" screens work but ...
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1answer
54 views

What is the exact formula relating a DC motor's input voltage and torque produced?

I'm trying to control a 12V geared DC motor with encoder through an Arduino by an L298D driver for my self balnace bot. Based on the angles from the attached gyro sensor and encoder, it calculates ...
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1answer
53 views

RS485 communication between Arduino

I want to transfer data (only numeric values) between Arduino Nano and Arduino Mega 2560. I tried with my own code and tried with several libraries also. Arduino Nano code ...
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1answer
76 views

Do I need a buck converter?

I am planning to build a circuit with a bluetooth audio receiver (MH-M18) and an Arduino Nano, connected to a DIN connector. I have a wire with 12V supply readily available to connect to the circuit....
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30 views

Need help configuring battery pack for quadruped project [closed]

I've done some digging and can't seem to find a solution this. I am working on a quadruped, and I am currently designing the power system, and can't seem to settle on a way to hook up the battery ...
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72 views

How to rule out that you have a faulty power supply?

Just for context: I'm trying to code an ESP8266-ESP01 through an arduino, but I'm failing and my primary suspect, as per other forum issues I read, is that the power supply is the fault. I've tried ...
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44 views

HowTo create an accurate constant-current dummy load using immersion heaters controlled by Arduino?

Given: variable sized nominal 3.2V LI/LFP battery cells, from little 18650 / 26650 cylindrical A123s up to large prismatics from CALB / Winston etc. the desire to capacity-test them off grid (no ...
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1answer
157 views

Amplifying particular range of analog signal

I am working on an a project where I need to get the reading of an analog transducer via Arduino's 10 bit ADC. The problem is, the range of the signal is such that the 10 bit ADC value is moving from ...
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1answer
57 views

Issues reading from an I2C device

I'm testing out the BQ25887 2 cell balance charging IC, and I'm trying to read the data from the I2C interface. But I'm not getting any results. I am unable to see any values from the serial monitor ...
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42 views

Why does my MAX30105 give wrong temperature reading?

I am using a custom made board for the MAX30105 sensor. I am checking with ESP8266 Arduino (Sparkfun max301505 library.) When the sensor is on, the temperature reading is 10 Celcius. It ...
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1answer
47 views

How to specify throttle range of RC ESC?

I've bought some cheap ESC's off banggood in order to build a drone. Now I'm trying controlling them using an Arduino. I just can't figure out how to use them properly. The ESC is called XXD HW30. ...
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27 views

Pro Mini wireless programming with auto start (reset)

After a long play, I made this adapter to be able to program a Pro Mini wireless via BlueTooth. The long play wasn't the adapter but the settings of the BlueTooth module (baudrate is fixed and need to ...
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2answers
45 views

How to connect wires between power supply and switch?

I'm trying to connect non-fused and European AC power socket/toggle switch to power supply. Probably very "newbie" question but as a starter I didn't want to try-fail with this thing for safety ...
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1answer
31 views

WAVGAT Pro Mini, no serial output

I ordered some Pro Minis however get some WAVGAT clone thingies. The first problem was it is running too slow (4x slower) when compiling with default "Pro or Pro Mini" board profile. Serial however ...
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45 views

How to ground external AC voltage (18V) to Arduino?

I have a project where I need to read 0-18 Volts AC in Arduino's input (0-5V DC). So I did a circuit with a diode (half wave bridge), voltage divider, and a RC circuit where I tested some values for ...
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2answers
52 views

What circuit simulators can also simulate ESP8266 and/or ATmega328?

I'm going to start soon some ESP8266 and Arduino Nano projects. I've used some simulators in the past, but none of them simulated these ICs. Dou you know if there is any simulator, that would also ...
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1answer
54 views

Charging a 3.7v lipoly battery at less then 4.2v?

I'm trying to experiment with supplementing battery power using microbial fuel cells. MFCs are batteries that produce their charge from decaying matter, but they often only get up to 0.9v (unless ...
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2answers
73 views

L298N heating up when driving a Nema 17 with Arduino

I've just bought a Nema 17 (Motor NEMA 17 40mm 1,2A 2,6kg/cm 1,8º 42STH40 1204A CNC) to build a pet feeder, and to control it I'm using a L298N driver I've also bought. I've wired everything together ...

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