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Questions tagged [arduino]

Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.

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1answer
55 views

Atmega328 Project

I want to make a sound system circuit using Atmega328. I want to connect a memory port for store sound files, If I use a single USB, Can I use this single usb for both file transfer to memory and ...
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5answers
48k views

Can't get a precise reading with PT100 temperature sensor

I am trying to get more precise temperature value from PT100 ( 2 wire ) sensor with Arduino. Here's how my circuit looks like : When the sensor is about 20 °C I get a value on A5 pin that is 432 and ...
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1answer
6k views

Phase Cut to Control Speed of AC Induction Motor with Arduino

simulate this circuit – Schematic created using CircuitLab So I'm trying to speed controlling a single phase AC Induction Motor(For Fan). And I am trying to use phase cutting to control it. So ...
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2answers
58 views

Power on Atmega

I want to design an alarm circuit using Atmega328 microcontroller. How much voltage supply to the IC will be better? In Arduino I see that 5v power supply used. For Atmega328 which will be better? 5V ...
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1answer
36 views

Arduino incubator

For my project I am building an incubator using Arduino. I use a DS18B20 to read the peltier temperature (TEC1-12706) a DHT22 to read the room temperature and the peltier. I also have 2 fans on both ...
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1answer
217 views

PT100 sensor for measuring liquid resin, fully submerged

Edited Link to Pt100 sensor (That's the best i could do) https://www.intech.co.nz/products/temperature/mrh.html Link to ESP8266 datasheet http://www.handsontec.com/pdf_learn/esp8266-V10.pdf ...
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1answer
51 views

acs71020 Connecting and reading voltage properly

I am using an ACS71020 3.3V I2C version hooked up to ESP32. I have connected the IC as proposed in the datasheet. Rsense used is 1.8k ohm as proposed in the evaluation board user manual for 230-240 ...
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1answer
104 views

Find tuned vertical movement component for arduino

I have an automation test setup which uses pneumatics for pressing a button (ordinary push button, like the one on an Arduino uno) on the test devices. I'd like to replace the pneumatics with a ...
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0answers
42 views

Arduino cannot set pinMode when the pin has connected to 5V

I'm new to Arduino, and want to build a FPV goggle. I'm going to use an Arduino board to switch on and off the camera, VRX, DVR, and audio. So I use four P-channel MOSFETs (AO3401) and connect them ...
1
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1answer
168 views

Arduino and car's 12V switch

I'm trying to control my headlights with my Arduino and a LDR. For this I will use the Arduino as a middle man between the lights switch and the actual lights. The switch has three positions OFF / ...
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3answers
35 views

How do I use multiple GY-521, I2C sensor with Arduino?

I'm working on an Arduino robotics project that requires I find the position of 12 different angles (I'm making a walking scale model of the Star Wars AT-AT and need to measure the angle of three ...
3
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2answers
872 views

How to get an analog signal 0 to 12 V DC based on reference 0 to 5 V DC?

I have an Arduino which is creating an analog voltage from 0 to 5 V (I used external DAC for it) and I need to use it for the regulation of "big" circuit with 12 V DC. So I am trying to get ...
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1answer
11 views

Bluetooth Controller using Arduino Uno and HC-05 doesn't work when connected to PC

I had an old Guitar Hero guitar that had the circuit board on the inside broken, so I decided to replace it with an Arduino Uno and an HC-05 to make it work over bluetooth. I installed the HID capable ...
0
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1answer
61 views

Floating analog input value

To use my sensor I need to supply 24V. So I converted 4.5 V from battery pack to 24V and converted it again to 0-1.66V using a voltage divider. So far I can read the output of the sensor using the ...
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1answer
81 views

Servo motor too noisy [on hold]

I’m currently using a Hitec HS-645MG servo to swing a piece of thick piano wire approximately 2ft long in a 180 degree arc. Servo being controlled via Arduino. It needs to swing back and forth ...
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1answer
63 views

Burning graphite with 9V battery vs. Arduino's 5V

First off, I'd like to say that I am completely new to electronics and the way circuits work, so this may be a really dumb question. I've tried searching Google but I can't really find what I'm ...
0
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1answer
148 views

How to estimate current consumption by ICs

I'm using an Arduino Due (3.3V) which has a maximum current for all pins 130mA. How to estimate consumption for a number of ICs? For an example i use multiple MCP4822 (2channel DAC) On the ...
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2answers
73 views

How to get audio data in Arduino using p2 audio cable?

I have this project where I need to get audio from my PC or smartphone through a p2 cable like this: I want to send it to my Arduino through an analog input. How can I do it? I stripped the cable and ...
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0answers
41 views

Alternative IDE for compiling and running arduino code? [migrated]

I am not super experienced with c++ and I know that the syntax for C++ and the code written/compiled by the arduino IDE are slightly different. I would like to be able to write code, compile it the ...
1
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0answers
26 views

Using force and buttons

So I am currently trying to make an interactive mobile phone cover that communicates with a game on your phone. The inputs to the game will be push buttons on either side of the cover. What I am ...
0
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2answers
289 views

Microcontroller - Measure Resistance in Circuit

I am creating circuit that will control power of heater coil. For controling power I am using Arduino PWM that controls voltage and by Ohm's Law I am calculating desired power. P = V^2 / R Now the ...
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0answers
26 views

Easiest solution for DIY car/boat ECU system [closed]

I am building a small smart kayak that uses solar energy to power a DC motor. I have planned to use an Arduino to collect sensor information and represent them to the human driver as a gauge, but I ...
0
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2answers
41 views

Voltage divider reverse formula

I have this schematic, with an power supply of 24V and I want to read this voltage with my arduino so i need a voltage divider, the formula for voltage divider is Vout = (Vin * R2)/R1+R2, so with my ...
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0answers
34 views

issue communicating between pi zero w and Arduino nano with nrf24l01

I am trying to communicate between a pi zero w and an arduino nano with the nrf24l01 module. I have got very far and there are no apparent issues, besides no messages not being sent between them. for ...
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0answers
20 views

Reading incoming serial Frame of bytes using arduino uno [closed]

I have two Arduino uno communicate between each other using Serial, Arduino 1: Send data frame in baud-rate 19200, Example :it send byte ...
0
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2answers
18 views

What is IDC connector pitch on a USBAsp?

I am planning to use a USBASP programmer to program one of my boards, and I want to use a fitting receptacle on my board. I fail to find the exact pitch that the USBAsp's IDC connector has (as I ...
1
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0answers
45 views

Why are my motors stuttering?

Using my Arduino Uno, I have managed to arm my drone motors and keep them running continuously and stutter free. I have an esc between the motors and the arduino so I am using the Servo library. <...
0
votes
4answers
164 views

Arduino sensor data erratic

I'm a noob just getting my feet wet in EE, so go easy on me, please. I bought an Arduino Uno and have been learning tons in the last couple weeks. I took an LM35 sensor, a generic thermistor (using ...
1
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2answers
990 views

Piezo into 0-5V ADC, with offset center voltage?

I want my piezos to have a center voltage at 2.5V for a 0-5V ADC input on Atmega328, so it can sense force in both ways - one way would be >2.5V and the other will be <2.5V. Will this circuit work?...
6
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1answer
278 views

Why is my 10k NTC thermistor on average accurate to 2C

I am trying to figure out what is causing the 2C inaccuracy in my thermistor calibrations, my goal is to get my accuracy down to > .1C. I am using the KS103J2 10K NTC thermistor. To calibrate my ...
1
vote
1answer
487 views

Ultra low power arduino wireless sensor : care of battery discharge

I'm prototyping an ultra low power wireless sensor. To consume less I run an Arduino Mini Pro at 1.8V at 8MHz with sleep 99% of time. The power comes from a LIR2032 coin cell and the 1.8V is ...
1
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1answer
125 views

Splitting Audio Out - are there any issues I am not seeing?

first post, so I hope this isn't TOO stupid a question. I am planning on building this circuit: https://github.com/trash80/Ym2149Synth/blob/master/Ym2149SynthSchematic-V29082016.pdf which eventually ...
0
votes
1answer
47 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/...
1
vote
4answers
4k views

Can a RF 433.92 Mhz transceiver communicate to a RF 433.42 Mhz Receiver?

I am working on automating my Somfy Blinds. The idea is to avoid using the remote control which works on 433.42 Mhz and use a simple RF transmitter and an Arduino. The thing is that I can not find any ...
27
votes
4answers
105k views

Can I use the analog pins on the Arduino for my project as digital?

I am new to using Arduino, and I have an Arduino Uno. For the projects I've done, I've only used the digital pins. I am building a small vehicle that uses stepper motors. I have run out of pins to ...
0
votes
2answers
55 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 ...
1
vote
1answer
64 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 ...
0
votes
1answer
259 views

Inconsistency Issues With Stepper Motor

I am attempting to get my stepper motor to rotate 90 degrees, stop for a second, and repeat these steps. Please note I am a beginner, but I have taken physics courses so I do understand most basic ...
0
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0answers
40 views

Extract binary numbers from infrared sensor that uses I2C bus [migrated]

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 ...
0
votes
1answer
42 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 ...
0
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1answer
91 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 ...
0
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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 ...
0
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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 ...
0
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2answers
241 views

Can I guess 5/3-wire RS-232 pins from voltages?

Objective: interface to an HPLC pump via the RS-232 interface described in the manual. Communication protocol is well described. Pinout is not described at all. Can I guess the pinout based on ...
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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, ...
0
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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
votes
1answer
108 views

Connecting multiple HC-06 bluetooth modules to multiple smartphones at the same time

So I'm having a "robotics" workshop for kids and we are going to control 6 robots with bluetooth modules. They run on Arduino. I tested the code before class and it worked as expected. I also changed ...
0
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1answer
118 views

Interface Self power Sensor with Particle Photon using 4-20mA current receiver

Is it possible to use 4-20mA self powered sensors using current receivers ? If not then what will be the best way to use these sensors and interface it Particle Photon to monitor the readings? Note:- ...
5
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3answers
14k views

Best way to get +5V or +12V or 0V from arduino pin

I am working on an eeprom programmer as an Arduino shield. There are two pins on my EEPROM that require a 12V signal as part of the programming process. One of them is an address pin that I am also ...
0
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1answer
49 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 ...