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Questions tagged [arduino]

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1answer
37 views

Extract binary numbers from infrared sensor that uses I2C bus

I have an infrared sensor(OTI 301) which in order to display the desired temperature I need to apply a formula that depends on 3 binary numbers extracted from the sensor itself. I have tried different ...
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1answer
41 views

what is the maximum ESP32 app code space for 16mb flash?

I am using esp32 dev kit with 4Mb memory Arduino IDE I have noticed when wifi example is running almost 50% of program space is used. after some research, I have set memory configuration to no OTA/...
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2answers
54 views

Interfacing Atmega 2560 with 74ls240 inverting buffer

I am trying to light up the 7 segment display using inputs to the Port B pins, causing output on the Port k pins, which are inverted using the 74LS240 chip. The Arduino is correctly outputting the ...
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1answer
88 views

Multiplexer that works by measuring voltage on select input?

Is there any small MUX device that would provide 8-64 inputs, which reads from a single select input? I'm thinking that instead of using e.g. 3 select inputs to set which signal input to use, such a ...
1
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1answer
60 views

Simple low power rising and falling edge enabled circuit

I am working on a project where I use an esp8266 and a reed switch sensor (NO), this is powered by a battery so I need a low power circuit that can turn on the esp8266 when the state of the reed ...
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0answers
23 views

How to power multiple Wemos D1 Mini

I’m planning on making my bay window blinds tilt automatically with Alexa. I've done plenty of research but can’t find my answers, hence the question. I have 4 individuals blinds which all need ...
1
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0answers
46 views

Did I do something here that could have damaged my Arduino Mega2560?

I built a simple project here with a Mega2560. I wired up a TEA5767 FM tuner module via I2C. I tapped into it's line out pins, did some DC biasing and connected it to analog inputs of the Arduino, ...
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0answers
57 views

Sending a double type value over CAN Bus

I need help to send a double value using a CAN Bus. I am working on a eletronic traction control and i need to send, by a CAN bus, the calculated values of speed of wheels. The problem start when the ...
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0answers
28 views

OTI-301 Infrared Sensor

I built an infrared thermometer using the MLX90614 IR sensor and an Arduino Nano. I needed a little higher temperature reading so I changed to the OTI-301 sensor hoping that it would work with the ...
0
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1answer
36 views

Arduino RGBW 24v LED strip driver

This might not even be the right place for me to ask, but I hope somebody can help; I have an arduino mega with 4 PWM outputs (5v, fitted with 220 ohm resistor) that I would like to use to control ...
-4
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0answers
47 views

How to repair keyboard which has motherboard issue? [closed]

Do anyone know how to make DIY keyboard motherboard.. Or any boards that can be connected to keyboard membrane
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1answer
47 views

3V Air Pump loses force when drived by a TIP120 transistor

I'm doing a project driving a 3V air pump motor with a TIP120 transistor connected to an Arduino board. The schematic is the following: When I connect the motor directly to the battery it has almost ...
0
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1answer
44 views

Arduino AC Motor Control and Automation? [on hold]

My question is about the automation of single phase AC motors. I am aware that I can purchase TRIAC controllers with manual knobs or even 0-10V control inputs. I am new to the world of AC ...
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0answers
40 views

Custom 12 V DC motor control with ESP8266 without PWM

Scenario (you might want to skip the lengthy back-story) I'm trying to integrate my home ventilation system with my home automation. It currently consists of ten fans with ceramic heat recovery ...
0
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1answer
41 views

How do I convert a PWM signal (with a specific duty cycle) to its respective Analog value, for an application in a low voltage,high current circuit?

I wanted a 16V,50A regulated power supply but could not find it in the market. I also searched for a buck converter for the same current output and could not find anything. So I thought of making it ...
0
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1answer
24 views

Ground with one sensor vs multiple sensors

I'm pretty new to the world of electronics and was working on an Arduino project using load cells and HX711 amplifiers. The project consists of four HX711 connected to the Arduino and Pi, with all ...
0
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1answer
44 views

Unable to get stm32 blue pill with arduino [on hold]

I'm trying to get STM32F103C8T6 (blue pill) working with Arduino. I'm using the Board manager file: https://github.com/stm32duino/BoardManagerFiles/raw/master/STM32/package_stm_index.json Board: ...
0
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1answer
28 views

MAX7219 led matrix prints unwanted artifacts when it is powered up

I’ve got Led matrix 32x8 which is driven by MAX7219. Like this: MAX7219 Dot Matrix Module Microcontroller 4 In One Display with 5P Line When I power it up, I can see different glitches. How to power ...
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0answers
27 views

Arduino Pulse Generation

I have a Arduino sketch that can rotate 2 stepper motor using a stepper driver that has 256 micro stepping. I used Arduino MEGA timer 1 and timer 3 with fCLK/8 prescaller for generating step pulse ...
0
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0answers
36 views

Can't run two RFID readers off the same 5V rail

I have a circuit consisting of an Arduino Mega2560 connected to a 134.2kHz RFID reader from Priority1Design. The RFID reader works fine by itself, however as soon as other components are connected to ...
0
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0answers
55 views

Driving a motor freezes Arduino

I am trying to drive a Carrera Digital car (brushless DC motor) using an Arduino and an L293D h-bridge motor driver. My schematic is the following: I have also connected an IMU (GY-521 MPU-6050) to ...
0
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1answer
69 views

INA219 bus voltage depends on supply voltage

I tried to measure voltage with INA219A connected to Arduino. As datasheet says INA219 works from 3V to 5.5V supply voltage but I get different values for bus voltage when I change supply voltage. ...
0
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0answers
34 views

Switch between 2 AC sources for a DIY Arduino-based UPS

I want to build a UPS that when the main AC source is under-voltage or not available, it will automatically switch to the inverter's AC output and when the main AC source is available again, it will ...
0
votes
1answer
37 views

Arduino Long distance cable tester

We have a 50 pair cable running about 1.5-2 KM with some services running on different pairs. One pair has recently become intermittent and is losing connection for 1-2 seconds at random. It might ...
0
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0answers
25 views

Programming Nrf52832 using Arduino?

Has anyone programmed a bare nrf52832. I have the ebytes e73-2g4m04s1b module. Nordics devzone suggest using segger j link and stuff. But I don't have access to any of those. Can I use Arduino Uno to ...
1
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0answers
185 views

Desperate plea to increase 10k NTC thermistor accuracy

For some time now, I have been trying to increase the accuracy of my thermistor for a competition, and I can't. I tried adding a 16-bit external ADC, and it didn't make a difference. Does anyone have ...
0
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1answer
100 views

Why do all my NTC thermistor have a PTC curve?

Suddenly, after testing my NTC thermistor (100k), the thermistor's curve started to turn into a PTC curve. To measure the resistance I am using an Arduino. I think its a hardware issue as I did not ...
0
votes
1answer
31 views

Initializing to MicroSD Card with Arduino produces error code 0x43, 0xff

I am trying to interface with a 32GB MicroSD card with an Arduino Uno, but the code consistently fails at the initialization stage. Below is my schematic (sorry for the horrendous schematic, I'm not ...
1
vote
1answer
76 views

Sewing machine speed and needle position control over arduino

I need control sewing machine speed and needle position over arduino project. Current sewing machine is: Brother X5, with 70 Watt motor with foot pedal control. Speed of motor will controlling by ...
0
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0answers
23 views

power decoupling 2 RFID scanners run by an arduino mega

I have an arduino mega 2560 hooked up to 2 Innovation ID-20LA readers, datasheet found here. My code works fine, as I have a single setup working perfectly. I don't know why the other setups don't ...
0
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0answers
29 views

Proteus failing to load .elf file for arduino simulation?

I've been writing code for an alarm clock based on the Arduino Uno, and then uploading it to a simulation in Proteus to test it out. Everything was working perfectly until I decided to try changing ...
0
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1answer
57 views

RF receiver always having 1 on output

So my problem is I want to build a wireless system with arduino and an RF module. It is like this one: But when I tested the module, with this site: https://www.instructables.com/id/How-to-test-RF-...
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2answers
65 views

Ws2812b circuit safety with 5V 12A

i am making a arduino project using 5v ws2812b 300leds/meter. Its going to be a motion activated led strip that runs along the side of the stairs. I will be using 3.5m of the led strip so 210leds at ...
0
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0answers
42 views

Can I run I2C devices in ISP pins?

I am trying to build an IR thermometer using an Arduino Nano, a I2C LCD and a I2C infrared sensor(MLX90614). my problem is that my Nano board only has 1 option for I2C ports which I am planing to use ...
0
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0answers
19 views

Inconsisent SPI data transfer with MAX31856

I am using an Arduino to communicate with a MAX31856 on a custom-built PCB. The Arduino is loaded with this library, which seems to be working correctly. Unfortunately the data being read by the ...
0
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0answers
17 views

Laser Controller using Arduino Uno [migrated]

---> I am trying to create a controller using Arduino Uno that simply detects pulses from a waveform generator mimicking a Laser Machine and then switches between 4 state machines states at the output ...
1
vote
3answers
99 views

Counting pulses using Arduino Uno

I am trying to count pulses from a waveform generator using an Arduino Uno. The waveform generator is set at the following settings: Waveform Type: Pulse Freq: 20 Hz (50ms) Amplitude: 3.0 Vpp Offset: ...
0
votes
1answer
108 views

Use microprocessor with arduino / ESP32 WROVER [closed]

I was looking through some of the atmel microprocessors, and I was wondering if you could use a microprocessor (say, the atsam91) as a coprocessor for a microcontroller (say, an esp32 wrover (240Mhz)),...
1
vote
3answers
528 views

If a module is “arduino compatible”, does that necessarily mean it isn't compatible with other microcontrollers?

I'm trying to find a GSM module to pair with a PIC32 microcontroller for a project and I've found some nice ones. The one I'm really interested in is the SIM800C GSM module. Many of them say they are "...
0
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4answers
84 views

Wiring a 28 segment LED bargraph (to an Arduino)

I need to control a Barmeter 28 led bargraph via an arduino (Mega). I believe I have found the details of the component here: http://www.barmeter.com/download/bl28-3005sk04y.pdf (BL28-3005SK04Y) I ...
0
votes
0answers
25 views

Can I use AC voltage from myRIO to power stepper motor?

I am using easydriver and arduino for a stepper motor provided on this website The motor is 17HS3401S Stepper Motor and I think this is the correct datasheet found on the internet for the same. ...
0
votes
1answer
42 views

How to ignore an undesired short output signal coming from arduino?

I'm currently programming a Nodemcu ESP8266 board, fully compatible with Arduino IDE. The project drive a relay board with a GPIO pin set as output. You can see the board pinout in the following ...
2
votes
3answers
85 views

Driving two MOSFETs with one AND Gate?

I am designing a circuit to drive the brakes on a DC motor. The brakes are a 19.9Ω coil that is disabled when energized (think wheelchair motor style brakes). The brakes work on 24VDC. I have found ...
0
votes
1answer
46 views

Trouble controlling LED strips with n-mosfets on 2 power supplies

I have 2 equal power supplies and I try to control LED strips using arduino and n-channel mosfets. I've split the strips between the supplies, strip A + arduino is on one power supply, strip B is on ...
0
votes
1answer
61 views

Best sensor to measure light intensity in open room

I am working on a project to understand how robot localization is effected by light levels. I am wanting to build a circuit which can be mounted on a small robot near the camera and can determine lux ...
0
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0answers
15 views

Compiling error for board chipKIT MAX32 in Arduino IDE [migrated]

I have a compiling error for chipKIT board MAX32, which looks like this: exec: "/bin/pic32-g++": file does not exist; Error compiling for board chipKIT MAX32. As I checked this file in Arduino/...
0
votes
1answer
31 views

FIFO Clock Setup for CMOS Detector

When attempting to construct a miniature laser beam profiler with the Omnivision OV7740 CMOS detector and an Arduino Due, I am running into some problems with FIFO reading/writing. From the datasheet, ...
0
votes
1answer
38 views

pull-up resistor relay (low trigger)

I'm having issues controlling a single relay module with an arduino. It works fine when its up and running but the relay initially starts triggered until the arduino can send a "high" signal to turn ...
2
votes
1answer
64 views

Measuring small currents at DC high voltages without floating meter

I'm doing a project with a Cockcroft-Walton multiplier that will output up to 40 kV DC at up to 10 mA. The the circuit takes an input of 10 kV AC at 60 mA and 60 Hz (from a neon sign transformer) and ...
0
votes
1answer
38 views

Arduino to PC multi-sensor device

This us for a liquid-cooled computer or server. Is it at all possible to ”daisy-chain” (possibly not the right term) multiple Arduino boards together for the following inputs? Multiple different ...