Questions tagged [hardware]

The physical circuitry and other components of a machine or device. This is distinct from the program code running on a device, which may be called software or firmware.

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30 views

HTU21 on GY-21 breakout board I2C problem

I am interfacing the HTU21D sensor with my nodeMCU v3. All good! I managed to get some readings etc. But when I re-upload my code the device does not respond. If I remove the power supply from the pin ...
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31 views

Running hardware interrupt function on NodeMCU ESP8266, Exception(0) after four iterations, can't disarm interupt function

I've been trying to test the stability and consistency of hardware interrupts on my NodeMCU ESP8266. I'm using the Arduino IDE. This sketch should not require any external circuitry and I think, but ...
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1answer
41 views

How To Activate H-Bridge?

My understanding of the H-bridge is, that activating in1 or in2 will direct the 12V current to the motor, so it either spins right/left. Not that in1 or in2 is the actual current passing through to ...
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HC-05 Stuck in slave loop mode (loopback)

got my HC-05 today and accidently set the AT+ROLE=2(slave loop) and now I can't get out of it! Anything I send it just resends it back to me, even commands like AT+RESET and AT+ORGL, they just get ...
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getting interrupt from ignition circuit [migrated]

This transistor ignition circuit for a model petrol engine is built from a proprietary kit. I have made it up and it works. Now I want to take a signal from it as an external interrupt to an Uno ...
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2answers
67 views

How can I upload a sketch remotely from a distant location onto an arduino that is power by a battery

Of course after developing a success full embedded product the next step would be making upgrades to compete favorably with new products in the market. Well making upgrades would require making ...
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2answers
29 views

Hardware/software serial for HC-05

can anyone please tell me the whole difference between hardware and software serial for the HC-05. I read UART,USB cable, serial and I was like really confused so what is the difference and advantages ...
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42 views

how to implement AES in LoRa Module with Hardware Flow control using ESP8266?

I am working on project where I have to do AES encryption of plain text received through normal UART port of ESP8266 create a cipher text and sending it to LoRa module (EByte E32 868T30D) through ...
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1answer
49 views

How can I understand which arduino I need to run some code?

I want to build this project (but any other project would give me the same uncertainty): https://github.com/ltpitt/arduino-n64-controller-library But I cannot understand which arduino I can buy that ...
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1answer
96 views

Why are my motors attached to an Arduino MEGA not running?

I verified my code and uploaded it to the board and that was successful. Info: - Using Mega 2560 Arduino Board with Adafruit V1 - 3 DC 12 volt motors - on HP computer Here is my code: #...
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1answer
66 views

No potential across output of H-bridge

I’m working on a robot with a club at my school. So far, our team has an H-bridge shield (https://www.freetronics.com.au/products/hbridge-dual-channel-h-bridge-motor-driver-shield#.WwI9omh_WEc) to ...
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1answer
93 views

Problem to Setting up i2c OLED wemos D1 mini shiled (64*24)

Hi I used this shield before well. But it didn't work when I wanted to work with him last night! this is my wireing : Now I want to know how to test that it is healthy? Is i2c address missing or ...
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1answer
147 views

Connecting MPU6050 to Arduino Lilypad

To preface, I am very new to Arduino and I watched this video on YouTube. It shows how you can build a motion controlled car with Arduino and I decided to make this for my school project. One thing ...
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2answers
20k views

Controlling Floppy Disk Drive with Arduino

I am having problems controlling a 3.5" Floppy Disk Drive with an Arduino Uno. I have the floppy disk drive powered with a computer power supply that is switched on, and the Arduino powered by my ...
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3answers
536 views

Esp8266 Vin pin

I've read that Vin pin is directly connected to usb cable in esp8266 (which is 5V). I wonder if I can power a relay 5V and a servo motor Sg90 with this pin? And is there any danger of doing that ?
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1answer
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Powering Arduino MEGA 2560 safely without computer [closed]

How can I safely power my Arduino MEGA 2560 and have it run programs without being connected to my computer? If I am actually able to do so I assume that means it needs a new external power source, ...
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1answer
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Difference between these two NodeMCU boards?

I recently received a NodeMCU (identical to the one shown in the first picture below) and originally, I was unable to connect it to my computer which eventually turned out to be driver issues; however,...
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2answers
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Is there some hardware that can be used to upload sketch source code via USB flash disk (Automatically By plugging it in)

Well am asking this basically to know if it is possible to create a bootable flash drive that automatically uploads any source code onto the arduino just like creating a bootable flash drive when ...
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39 views

Arduino Due 9-bit serial - Can core Due Libraries be modified to get this functionality similar to Mega and Uno?

Need help to see if I can get an Arduino due to receive and send 9-bit com as already implemented on AVRs like Uno, Mega and even teensy boards, by modifying hardware serial cores. Have not found any ...
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1answer
70 views

Can I put a resistor in the ground connection of my DHT22 sensor?

I'm building a project that uses a couple of Adafruit DTH22 temp/humidity sensors. (https://www.adafruit.com/product/385) I have them wired into my project box through 3.5mm mini plugs (The kind that ...
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1answer
110 views

No Data Received on Serial Port & Unable to DFU Reset. Advice?

Having a problem running my original code that I tested last week, which worked on multiple days last week. I tried to do a DFU reset and update the BootLoader, but it didn't work. I checked the ...
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3answers
1k views

74HC595 shift register not working

I got my Arduino kit a few days ago and I've been going through some of the tutorials. I got to the 8 LEDs with a shift register tutorial, where I got stuck. Nothing would light up after I plugged ...
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1answer
2k views

Can the official arduino GSM shield library be changed to work with hardware serial on mega

I have a complex requirement that uses a number of libraries that depend on timing I.e. OneWire. When using the official GSM shield on a mega, it loads a version of software serial to talk to the GSM. ...
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0answers
147 views

ESP8266 Loop cycle frequency gets decreased after WiFi got disabled

In a traditional scenario, after the setup() method we go to the loop() method of our sketch. You know, usually it gets executed probably 5-10 times in a second (or even more). I am now playing ...
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3answers
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Help me get my robotic car to work?

So I recently followed a tutorial on youtube and I've assembled the car and connected all the wires. What I've done: Car Now in the video, when the guy connects all the wires, the wheels constantly ...
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2answers
709 views

Is the LGT8F328P legal?

Since some months, everyone can buy a board with this IC. It is compatible with the ATMega328 and has some features like 12bit ADC (instead of 10 bit), DAC, unique ID and also 32MHz. But I can't ...
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4answers
184 views

Program Arduino then Remove Atmega?

Can I program an Arduino and then remove the micro-controller from it and use it on a breadboard without reprogramming the micro-controller again? My steps would be: create my Arduino code. I upload ...
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2answers
302 views

Why is my arduino acting like a radio? And is there a way to abuse this?

I am playing around with an arduino and a cheap SDR dongle and I just noticed something strange! When I play a tune on pin 13 with just a random piece of wire connected to the pin (Using the Melody ...
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2answers
79 views

Using 8bit ports as 8bit I/O variable (while using USB,I2C, SPI and Serial) - keyboard

I am seeking HW. I would like to make keyboard with enhanced functions (RGB backlite, macros, programmed profiles etc) driven by some small MCU (Arduino Micro Pro or something similar). To support ...
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0answers
51 views

Help with turning LED on using smartphone with HC-05

I followed this tutorial: Remote Controlled LED using HC-05 I've assembled everything, uploaded the code and connected it with my phone. The code: /* Arduino Turn LED On/Off using Serial Commands ...
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25 views

Having problems with Lilypad [duplicate]

So I recently bought a Lilypad and a Prolific PL-2303HX which I only discovered when connecting it to the computer has phased out since 2012. I found a video online which shows the solution was to ...
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What can cause an Arduino to “disconnect” from Windows?

I bought a DFrobot Beetle and it worked fine for probably an hour, then it just stopped working with Windows. When I connect it to the computer I hear the "connect" sound, then within 5-7 seconds I ...
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1answer
162 views

USB DEVICES WITH THE 32U4?

I have an Arduino Pro micro and I need to know if it is possible to use an USB device like a camera or things like that Since the processor is a 32U4. the USB Shield is for the Arduino Uno and I don't ...
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1answer
44 views

What hardware do I use to detect an electric current going to a lightbulb and tell if it is turning on and off [closed]

I’m doing a project where you have to detect a lightbulb coming on through the electrical current and was wondering what Hardware and what the program is? Can y’all help? Very much appreciated if y’...
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1answer
120 views

How do you use the plastic cover/case that came with Arduino?

They have holes for screw on, on top of the holes on the Arduino itself. Where can I find parts that are compatible with this case/cover? What was the intended use of this case/cover? Thanks.
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1answer
45k views

How to Reset or Format the Arduino?

My Arduino got damaged by a short circuit so I tried my board with a simple code it gives me wrong results, so is there any way to reset or format it?
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2answers
986 views

Power on reset with arduino uno can never happen. Can this be fixed?

When an Arduino Uno is powered on, the USB chip's DTR output pin may (is, in fact) low for a while. This means that the capacitor C5 is connected from the 328p reset pin to ground. Thus, when power ...
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1answer
126 views

MOSFET dimmer IR controlled

I am trying to make a group of LED dim with PWM to a MOSFET. The code seems to work for this, but the trouble is that the IR receiver will only receive the signal to turn on the lights and then IR ...
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2answers
42 views

Load Resistor Use for Voltage Sensing by Arduino

I connected a piezoelectric film to a Arduino Uno board via analog input. However, as I was getting very high voltage values (reaching 5 volts without much movement). Therefore, I added a 1 megaohm ...
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62 views

how to differentiate in code between Sangunio and Microduino core+

Sanguino and Microduino core+ both uses ATMEGA644PA. I need to write a piece of code in my library where I need to check what board has been selected. #elif defined(__AVR_ATmega1280__) || defined(...
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0answers
58 views

Is there an easy way to connect and control 3 servos?

I need to connect and control three Parallax Standard Servos to an Arduino board, and apart from the USB connection, nothing else will be connected to the board. My predecessor used a setup of and ...
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2answers
1k views

Which kind of diodes I should use in buttons/keys matrix input? (Making gaming keyboard)

When making matrix input of NxM columns/rows with push buttons, there should be a diode next to each button to prevent "ghosting" and able read many keys pressed together correctly. There is a lot of ...
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1answer
102 views

AC Voltage Sensing using Arduino Uno

Is it possible to sense AC Voltage using analog input for Arduino Uno or can it only read DC? I mean I've tried connecting an AC voltage source to analog and I'm reading some numbers. However, I don'...
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3answers
288 views

Is there an alternative to soldering to connect boards?

I know that shields are usually soldered to headers so they can be attached to the board with the Arduino. I have a tremor, which makes soldering impossible. Are there ways of connecting PCBs without ...
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1k views

Change the mac address on an HC-05

So I tried to save a little money and bought (5) HC-05 bluetooth modules off of our good buddy eBay. When the modules arrived, as I was testing and setting up for my project (2 nano's connected via ...
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1answer
217 views

Arduino Hardware serial pins with RS485

I tried asking a question in my earlier post - SerialEvent with RS485 communication it helped me understand Hardware serial and Software serial but i had few more questions for which i started this ...
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1answer
1k views

Pulse counter to measure flow-rate: 0 Pulse issues

I am using a Netafim M-Series flow meter interfaced with a UC-32 Arduino. The goal of this is to create a pulse counter than in turn will allow us to determine flow rate in the meter. (1 US gallon per ...
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1answer
166 views

Motor isnt spinning when using L298N motor controller

I have a L298 motor controller connected to a motor with a 6 volt power sources. the motor however isn't spinning any ideas I'm using a esp 8266 node mcu board. I would like to use pwm but for right ...
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1answer
243 views

Getting at the PS_ON pin on a RAMPS1.4 mounted to a Mega

Got it! Check end of post for solution. I'm running a Mega 2560 with a RAMPS 1.4 Shield which is usually used for 3D printing applications. For my use case I only want to get at the stepper motor ...
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3answers
10k views

Help with parts identification from arduino starter kit from aliexpress

Ordered an arduino starter kit from aliexpress Link The parts list they provide (as a jpg on the order page) is vague and not very descriptive, I've gone through most of the parts and am down to ...

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