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Questions tagged [arduino]

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

1
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1answer
130 views

How to design for electrical connection for a food dryer

I am on this project in building food dryer to dry 2 kg fish cracker maximum per use. Based on the calculation, I only need to use power of approximately 60 watt for the heating to achieve the energy ...
0
votes
0answers
18 views

Arduino frequency measurement

I am using an ATMEGA328p to measure the frequency of a 50% duty cycle square wave in the range 2khz to 15khz. The square wave is being generated by a good quality Function Generator and I can see on ...
0
votes
2answers
126 views

HC-SR04 Distance Sensor Trigger Signal on 2.5V Voltage level gives no reading

I am using an Arduino on a breadboard setup with an ATMEGA328p MCU. The whole circuit is designed to work in a low-power state and is powered using a 3V (Nominal) voltage Coin Cell. The HC-SR04 is ...
2
votes
1answer
39 views

Controlling Mosfet with ATTiny85 and IR Reflective Sensor

My plan is to start a motor, then stop the motor when the gear teeth gets to 15. I will be able to tell at what position the gear is by placing an IR reflective sensor under the teeth. The sensor is a ...
0
votes
1answer
4k views

Arduino 4N35 input

I trying to interface the arduino digital pins through an optoconnector attached to an LED of a consumer electronic device. I have bought the recommended component for this. Before I would even get ...
0
votes
1answer
134 views

Inductive sensor signal voltage too low, how to boost it for Arduino?

I have an Inductive proximity sensor that is listed as working with 5v. M8 2mm sensing DC 5v Inductive Proximity Sensor NPN NO LJ8A3-2-Z/BX-5V It was the model recommended. When using 5 V, I get 0 ...
0
votes
1answer
36 views

MKR Vidor 4000 Verilog tutorial

I can't find any tutorial on how to write verilog on MKR Vidor 4000. If you have done it what software do you use to synthesize, simulate and create a bit stream to the board ? Thanks,
-2
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0answers
32 views

connecting power resistor to arduino as a heater? [on hold]

how do I connect power resistor to a Arduino. it take 15V to reach the temperature I want and I have to maintain the temperature.
-2
votes
1answer
52 views

STM32 Usart Forwarding [on hold]

Please I cant figure it out this whole week about How to program a usart forwarding function in Atolic for Stm32. The function is like Aduino IDE's "uart2.write(uart1.read());" for Stm32 with Atolic ...
0
votes
0answers
24 views

HDLC with Microcontroller [on hold]

I want to communicate a Microcontroller with a third party embedded card communicating over HDLC. Preferably I want to achieve this using AVR or Arduino. The HDLC channel consists of a data and clock ...
0
votes
0answers
32 views

ESP8266 Webserver not reachable after 2 minutes from reset

I have a Keyes Espressif ESP8266 NodeMCU, I have two LEDs that I want to control which are connected to the ESP. When I open the webpage http://10.0.0.5/5 after ...
0
votes
2answers
146 views

Why 2 electrolytic capacitors and Schottky rectifier at power supply?

I am trying to design and improve the power input part of my circuit to supply power to a motor driver that controls 2 DC motors. I did some research and i found this circuit but i cannot fully ...
-1
votes
0answers
13 views

Arduino nano and Lora SX1278 receiver hangs/stuck after some time [on hold]

I am using arduino nano with Lora 2 (sx1278), I need to run continuously. therefore I have set up a power backup as well. in the circuit, I am using LM1117 3v3 800mA power to the module and Arduino, ...
0
votes
1answer
36 views

Capacitor DUE board 10uf polarized?

I found in the schematics of Arduino DUE some polarized capacitor but in the board I can see NO polarized capacitor. Somebody to know why ? I guess the capacitor on board is like a capacitor 50v ...
0
votes
2answers
49 views

Level shifter for WS2811 led strip

I'm trying to control a WS2811 Led strip with an ESP32. I'm using a logic level shifter to convert the 3.3V output of the ESP32 to 5V. I bought this level shifter (txs0108e) https://fr.aliexpress.com/...
0
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0answers
16 views

Using use the STM32F103C8T6 board with the Arduino [migrated]

last two days I am trying to programm my blue pill with arduino ide, helplessly... Actually, I managed to install simple blink program, but after that, all other attempts ended up with: ...
1
vote
1answer
135 views

Battery life calculation using Nano, NRF24L01+ and window magnetic reed switch

I'm trying to make my own home wireless security system. I will be using probably 3 AA batteries to power these devices. My problem is that I need to know if the batteries will be enough to power ...
4
votes
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 ...
-3
votes
1answer
101 views

Which arduino is inside the device [on hold]

I've got a few devices made using the arduino board. I was asked to update the program. However I've different version which must be used for different arduino boards. Is there a way to get to know ...
20
votes
2answers
38k views

Active vs Passive Buzzer

I recently borrowed an Arduino Inland Basic Starter Kit. It includes an active and passive buzzer. What is the difference? I can hear a difference in sound when I use the ...
0
votes
1answer
36 views

Looking to find out how to power 2x 12v, 0.2amp, 3pin computer fans through an arduino uno

I'm fairly new to using Arduino boards. I'm trying to make a fan controller for two 3-pin fans that run on 12V at 0.2 amp. I read that all I need is a power supply that will run at 12V and #of_fans * ...
0
votes
1answer
143 views

RC car problem using bluetooth module

I m making a small RC car and to control it, I m using a HC05 Bluetooth module. My car is rear wheel drive using two dc motors and the front wheels will just turn left or right for navigation. Can the ...
2
votes
6answers
38k views

How do I burn an ATmega328 chip via Arduino UNO as ISP?

I've an ATmega328 chip (without a bootloader), and I want to burn it with my Arduino Uno as ISP, so I can have a spare ATmega328 with an Uno bootloader. I'm trying to follow the instruction in Using ...
2
votes
4answers
1k views

Build a scale without computer

I need to build a scale that is not attached to any computer. The goal is to weigh a dustbin and show the weight value on a small LCD screen. The weight I want to measure is approximately 10 kg, but I ...
0
votes
1answer
2k views

SainSmart 5V 4 Channel Relay momentary switch [closed]

I am wanting to hook this relay up here: (source: sainsonic.com) What I am wanting it to be hooked to (output) is the PWR and reset switch on a PC motherboard to act as a momentary switch: (...
0
votes
2answers
199 views

fluctuating ADC Reading for 4-20mA Pressure transducer input

I am working on one project of water pressure measurement, in which i used pressure transducer which gives me output between 4-20mA Current form. I am using one 250 ohm resistance to convert current ...
0
votes
0answers
41 views

garage door button with delay feature [migrated]

I am working on an art project that involves a garage door opener. I am very new to arduino, and electronics. I have a starter kit with a ton of accessories. The garage door opener has 2 screws (...
0
votes
1answer
306 views

How to fix the error “Response code 0” to get “Response code 202” to bulk update a thingspeak channel?

I am using this example: https://www.mathworks.com/help/thingspeak/continuously-collect-data-and-bulk-update-a-thingspeak-channel-using-an-arduino-mkr1000-board-or-an-esp8266-board.html According to ...
0
votes
1answer
42 views

which is faster GPRS vs 4G on arduino?

I am using Sim800 GPRS to send data to MySQL server online. I use Arduino mega 2560 for one update in MySQL, it takes 1-2 seconds to run required AT commands If I use a 4G module like SIM7000E will ...
0
votes
2answers
125 views

2 LED strips in parallel dimmed with PWM

If i have 2 LED strips of 10 amps @ 12 volt and I connect them in parallel . Can i run them off a 10 amp transformer if I use a 50% PWM duty cycle ? I assume that if the PWM is not in sync that the ...
0
votes
1answer
31 views

Advice on getting a stable analog reading of capacitance

I would like to detect the presence of a person's hand in a project. I am aware that one can use a capacitive touch system to do this. I have used a TTP223 module in the past and this works great ...
0
votes
1answer
32 views

Atmega32u4 USB and USART

I have an ATMega32u4. My question is about the bootloader section. How does this device pretend to be a com port while connected to USB? What makes the computer think it is a com port and how can I ...
0
votes
1answer
232 views

Increase Measurement Distance of a Capacitive Proximity Sensor - Arduino Project

So I am working on a project that I found online at (https://makezine.com/projects/a-touchless-3d-tracking-interface/). However, instead of using my hand to track, I want to track an aluminum ball ...
0
votes
0answers
34 views

Credit card testing using iPP320 and Arduino [closed]

I was able to connect the iPP320 and Arduino to my computer and use C# for testing different use cases of a credit card. I am using a single test card for the process. Is it possible to load ...
0
votes
3answers
58 views

How to monitor the voltage of a bunch of batteries using Arduino?

Ive got about 36 batteries that all stay between 2.8v and 3.6v, and I want to be able to accurately monitor the voltage(and therefor the state of charge) of all of them using an Arduino Nano, the two ...
-1
votes
2answers
50 views

Can we prepare any ICs similar to decoder or demux , but for selecting multiple pins simultaneously?

It is possible to select the output pins sequentially using decoder or demux. But for selecting more than 2 output pins at same time, they don't work as the decoder /demux are single output selector ...
3
votes
4answers
21k views

How to decrease the motor Speed without losing the maximum Torque

I am using MDS40A motor driver(http://www.cytron.com.my/viewProduct.php?pcode=MDS40A&name=SmartDrive40) to drive a power window motor (12V, brushed motor) similar to the one at (http://www.cytron....
1
vote
2answers
53 views

Is it good to wire WS2813 LED strip DI and BI together?

I have so far only worked with WS2812 strips and understood, that the WS2813 have a backup data line. But how do I connect the first LED to my Arduino (acts as a controller)? Many tutorials said I ...
11
votes
4answers
50k views

How can I spin an old HDD motor?

I've stripped out an old IDE (40 Pin) HDD from 1998 for use in a POV display project (Gr. 12 Computer Engineering), and I've been trying to spin it up. The problem is that the HDD motor is brushless ...
1
vote
1answer
61 views

36:6 analog multiplexor?

I'm trying to connect 36 analog voltage sensors to the 6 analog pins of an Arduino Uno and cannot figure out the simplest way to go about it, given that I need to be able to accurately read a voltage ...
0
votes
1answer
129 views

Arduino Interfacing Breadboard with SD Card + Shift Register

I have a small circuit, and use a shift register (74HC595) to help add output ports to drive an LCD display. As far as I have found, the latch pin can be connected to any digital pin, and I have it ...
1
vote
1answer
68 views

12 V Solenoid Valve Not Opening

I am a chemical engineering student. I need to control a valve and pump system using an Arduino Uno. I was testing out my 12V DC solenoid valve with a variable DC power supply, and noticed that the ...
-4
votes
0answers
32 views

Finding the correct way for sending and receiving data over serial port arduino [closed]

I am working on a project in which two arduino boards have to be used. One board is used for acquiring analog signals from sensors and sending these signals serially. Other board has to receive these ...
0
votes
2answers
7k views

Understanding the serial transmit buffer in Arduino [on hold]

From a different question that I posted, I realized I am having a hard time understanding what exactly is happening in Serial.print, Serial.read, etc and the buffer. I'll use my code as a specific ...
1
vote
1answer
137 views

help me pick the correct mosfets for low voltage coreless dc motors

I'm building a minidrone based on an eachine using the same components as the original but instead controlling it with an arduino nano, a bluetooth module and a 6 axis gyroscope. I had available 2 ...
1
vote
1answer
36 views

NTAG213 Not being picked up by the RC522 Module

I have been using the RC522 module to read and write things to the tags it came with. But when I tried to use an NTAG213 I bought for a recent project it will act as if it isn't there. I've tried a ...
1
vote
2answers
83 views

Detecting when an illuminated AC doorbell is pushed

I have an 8VAC (can be switched to 12VAC if required) pushbutton bell which is in series with two "ding dong" chimes. The button is illuminated with an incandescent bulb, also in series. Pushing the ...
0
votes
0answers
25 views

Cannot use SoftwareSerial and RS485 protocol in the same code

Could someone help me ? I want to make 5 nanos communicating through RS485 protocol with my Arduino Uno master. This part is working great by using the code of http://www.gammon.com.au/forum/?id=...
1
vote
1answer
47 views

Reading a low voltage signal from a battery connected to a transformer

So currently I am trying to read the current draw from a battery that is being run through a transformer to generate an arc to light a gas burner. I have a roughly 1 ohm piece of wire that I am ...