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Questions tagged [arduino]

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

3
votes
2answers
63 views

Am I able to increase the current without also increasing the voltage?

Right now I have a bunch of motors (in blue on the diagram) that I believe are connected all in parallel. I tried hooking them up to the Arduino (3.3V-red and GND-black), but can't seem to get the ...
0
votes
0answers
5 views

Arduino IDE + Metro + I2C device (Grideye) + Code for Uno = weird results? [migrated]

I have been working successfully with the arduino uno and a thermal camera device called grid eye. There is a board available at the popular suppliers of arduino addons. For the uno, the code looks ...
0
votes
1answer
41 views

will dc converter discharge battary?

I am using a mini-360 dc-dc converter with arduino pro mini, so will mini-360 discharge battery without any load? Is it correct to use power switch as on image?
1
vote
1answer
84 views

Multiple power supply potentials

I am making a Project with an Arduino driving a stepper motor with a driver board. USB will still be connected to send commands over serial. EDIT: I am building an EggBot driver board for my Arduino ...
3
votes
1answer
116 views

As a computer science engineering graduate, do I need to learn Assembly language in today's day and age? [closed]

Given that there are simple and easy to learn/use MCU devices such as those offered by Arduino, Particle, TI (MSP430 series), Microchip (PIC16 series) does it make sense to teach ALP to computer ...
2
votes
1answer
66 views

Voltage shifter 0-30VDC

I am required to generate and measure squared signal (PWM like). I should cover a 0-30VDC amplitude. High level of the signal is 30 VDC, low level is 0VDC. The bandwith to be covered is 0-20kHz. I ...
0
votes
1answer
63 views

Stepper Motors (NEMA-17) Won't Run When Wheels Are Attached

My team and I are creating a robot using 4 stepper motors with mecanum wheels and an Arduino Uno. The code appears to be correct, and the motors seem to run just fine on their own, but once we screw ...
0
votes
1answer
61 views

How to select current for power supply? [duplicate]

I've two step motors with 12V-0.4A each, A4988 as stepper motor driver and CNC shield on Arduino. As I know I should use at least 2x voltage for stepper motors and I would like to know, if I use 24V-4....
0
votes
1answer
86 views

How to build a digital potentiometer with standard value resitors and MOSFETs?

I like to create a digital potentiometer with standard value resistors and MOSFETs. The principle is easy: I put a lot of resistors in series and parallel to each resistor I have a MOSFET which ...
1
vote
2answers
100 views

using pressure sensor with 0-10v output for 0-10bar using arduino but pressure value won't cross 4bar. so is a voltage divider required in this case?

I have a pressure sensor working at 24V dc whose output is analog 0-10V for 0-10bar pressure. I am using this sensor with Arduino Uno. I know that the pressure value will never go beyond 4bar. So do I ...
0
votes
1answer
40 views

External VCC for USB cable while keeping data connection

I want to connect my android phone and arduino to create a fast and reliable serial connection. I've read that it is possible with USB OTG but i will need to charge my phone eventually. So i was ...
0
votes
1answer
106 views

Not able to levitate magnet for magnetic levitation project

I am following a hackster project on magnetic levitation here - https://www.hackster.io/jsirgado/magnet-levitation-with-arduino-eeeee4 However, I have followed everything but still, it's not working. ...
0
votes
1answer
181 views

Uni-Directional Electret Microphones and an Arduino

I am currently trying to connect an electret microphone to an Arduino. I have found many circuits to do this but some don't work. I have tried one such circuit with a LM386 with no success. ...
-1
votes
2answers
57 views

electronic dc voltage regulator controlled by arduino

i am new to the electronic things so please help me figure out a solution. I am looking for a way to control voltage by Arduino of my 60volt 10 amp dc power supply i.e to get any voltage from 0 to 60 ...
1
vote
1answer
62 views

Serial Peripheral Interface (SPI) vs Two-Wire Interface (TWI, I²C) wire length

I'm using Arduino DUE to read data from an IMU(inertial measurement unit) sensor (MIKROE-1577, MPU-6000) This IMU sensor supports both Serial Peripheral Interface (SPI) and Two-Wire Interface (TWI, I²...
0
votes
1answer
31 views

Building a CNC with external drivers - RAMPS needed? [closed]

Well, I'm upgrading a closed-source CNC machine with Arduino (and GRBL), but I'm confused if I really need the RAMPS board. I want to drive the motors with external drivers. I have a RAMPS 1.4 board ...
0
votes
1answer
45 views

28V Stepdown with TracoPower TRN 1-2411 DC/DC converter for ESP8266?

Im new to electrical engineering. For a project I want to supply an ESP8266 with power by using a 28V Milwaukee Battery. My Question is: Can i supply the esp at the VIN PIN using the 2411?
1
vote
1answer
29 views

What happens if the load (connected to the output of the circuit) disconnects suddenly from Arduino/ESP32?

My circuit (that contains esp32 with few current and voltage sensor) is connected to 9Ah Battery (with BMS), where the load gets connected to see the discharge rate of the battery. There are times ...
0
votes
1answer
45 views

If I need to send GPRS commands is it better to use a “proper” modem, arduino or a mobile? [closed]

I need to send some commands from a computer via GPRS protocol to some devices. The options I have found so far are: Commercial GPRS modem Arduino GPRS shield an old phone as GPRS modem Is there ...
0
votes
1answer
45 views

CNC Shield V3 and step motor controls

I'm trying to build a laser engraver/cnc router with Arduino Uno, CNC Shield v3, A4988 step motor drivers. I'm newbie about electronics and Arduino so sorry if I'm asking non-sense things. I've ...
0
votes
1answer
73 views

Serial line switching through a transistor

I want to switch my RS-232 TX pin.For this I am using NPN transistor in between the TX line in such a way that the collector terminal is connected to controller side and Emitter to external side. ...
0
votes
1answer
105 views

Simplest way to switch inductive load with arduino?

I'm trying to switch (just on/off) a 3.7V motor (coil resistance 2.2 Ohm) and a 6V motor (coil resistance 8 Ohm) with an arduino mini. And I have trouble finding an universal way to do so. What I ...
2
votes
1answer
70 views

Interfacing 16-bit SRAM/MRAM with Arduino Mega

I a looking to interface a MR2A16A 4Mb 16-bit MRAM with an Arduino Mega. I am new to interfacing with memory chips and would like some advice from someone more experienced than myself. I am not ...
0
votes
0answers
13 views

Frequency of HID reports using RN-42

I'm currently trying to connect a PS1 controller to my laptop through Bluetooth. My current setup is an Arduino Uno interfacing with the PS1 controller, which I managed to do using this guide. After ...
0
votes
1answer
61 views

Can I connect an Android smartphone to an Arduino Uno? [closed]

I'd like to connect my main Android smartphone (it's a ZTE Blade X) to my Arduino Uno. My main reason is I'd like to use the camera on my phone as a sensor for the Arduino, for various projects. Is ...
-4
votes
0answers
39 views

Problem with 74hc595 output pins

i recently bought a 74HC595 shift register and just wanted to test it to see if working but i encountered some problems with output pins, in my code below it receives user number from 0 to 9 and ...
5
votes
6answers
9k views

What is going wrong in this circuit which supposedly should step down AC to arduino friendly voltage?

So I'm using this circuit but when adapter output is disconnected and only midpoint terminal of the transformer is connected the Arduino input pin reads some mV. mid point reads perfect 2.5V. What am ...
0
votes
0answers
45 views

Operating AD5780 EVAL Board Via MicroController [migrated]

OK, so thanks in advance because I am new here. I am reading the AD57XX drivers here https://wiki.analog.com/resources/tools-software/uc-drivers/renesas/ad5780 and am struggling to understand how to ...
0
votes
2answers
64 views

How to mount four 6-wire 10V load cells on Arduino or Raspberry Pi?

I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent ...
0
votes
1answer
102 views

Trouble turning on relay using PNP transistor

I am having problems turning on this relay: https://omronfs.omron.com/en_US/ecb/products/pdf/en-g6qe.pdf Using a transistor whose base is connected to a digital signal of an Arduino Nano. The ...
1
vote
2answers
53 views

op-amp outputs supply voltage on GND Signal

I am trying to use an op-amp (first time). I know the basic theory of its amplification circuits. To test I am using an Arduino Nano Microcontroller to create a Signal (0-5V). I want to amplify the ...
0
votes
2answers
64 views

Arduino pin connection basic

In the Arduino Uno's basic manual, connections for fading led are given. They have connected led on breadboard. The positive of led is connected through a resistor to the pin no 9 (pwm) and negative ...
0
votes
1answer
52 views

Converting Pulse Sequence Inputs Into Separate Outputs

I'm trying to find the simplest way of accomplishing the following task: Convert 3 different pulse input sequences into one of 3 different output lines The image below explains the problem ...
0
votes
1answer
36 views

Unpowered 74ls chips vs Powered Nano?

I have a power-hungry 74ls digital logic project that I want to connect a USB-connected Arduino Nano to, but I'm not sure how design the interface between them safely. The project has an external 5V ...
1
vote
2answers
92 views

Converting a variable frequency to TTL HIGH and LOW levels, based on a fixed (possible non-fixed?) frequency

I have a square output from an LM324 op-amp (0 and 5 volts) which has a frequency between 1 to 500 Hz (yes, low frequencies). I would like to find a simple way to have HIGH TTL signal when it is over ...
0
votes
1answer
49 views

ATMEGA328p-AU BootLoader

I have ATMEGA328P-AU chip, to burn the bootloader I used ARDUINO Uno Board as "ARDUINO as ISP" with setup Board: Nanno. I'm getting the following error. While looking for the solution I got ...
0
votes
2answers
105 views

L293D DC motor affecting LCD display

In the circuit below, I have noticed that when the DC motor (12V) is disconnected, everything works nice. The LCD correctly displays what arduino sends to it. But ...
0
votes
2answers
65 views

Best way to power LED strip (180 LEDs)

I'm assembling this addressable RGBW LED strip setup that is 3m long and 60 LEDs/m. I have found no answer to my two questions on other sites or youtube. (This is the strip I'm using: https://www....
4
votes
1answer
117 views

Capacitors in parallel going negative

Interesting (maybe?) question here which I am struggling to answer. Hoping someone can help. I have a capacitor network; 5 caps in parallel and then two modules of that configuration connected in ...
0
votes
2answers
46 views

Making a simple 1 MIDI IN + 1 arduino MIDI OUT merger (MIDI THRU + TX)

From the Midi DIN spec schematics we can see MIDI THRU is just MIDI OUT directly at the end of a MIDI IN. Is it possible to just add a midi signal from the arduino TX ("FROM UART") to the midi thru (...
2
votes
2answers
118 views

Building a midi project with Arduino + scrap components (optocoupler and diode)

Original title: 300V output Optocoupler in a 5V circuit I'm (new to this) trying to build a midi controller (in and out) with arduino and scrap. I guess I had several questions in one so I changed ...
2
votes
0answers
83 views

PWM to synth control voltage improvements

Just built this little circuit to control my Moog Werkstatt. The plan is to make a MIDI-to-CV converter and add more CV outputs and of course a GATE output later. But before going further, I thought I'...
1
vote
0answers
44 views

HX711 Load cell providing constant large and negative reading

I'm currently working on a project that uses the HX711 load cell amplifier while connected to a series of strain gauges in a full bridge circuit. I'm using an Arduino Nano and have the CLK of the ...
1
vote
1answer
70 views

Mosfet: gate voltage 0 but still led strip on

LED strip: DC, 4W Mosfet: IRF740 (datasheet) To Do: Use wall socket (AC) to run DC led strip and also turn it on/off with MOSFET and arduino. AC to DC is done with rectifier and transformer. So ...
0
votes
3answers
76 views

doubt when Arduino connects to multiple i2c devices

I am using Arduino nano to drive multiple i2c devices, actually, they are premade modules which are available on eBay. ads1115 ADC, ds3231 RTC, 20x4 character LCD i2c module, at24c02 EEPROM module ...
0
votes
2answers
78 views

Relay Sometimes Not Switching

I have a question about relays used by an arduino. I know how to wire them and they work fine for the most of the time. But sometimes the relays doesn't correctly switch on or off. I can clearly see ...
0
votes
3answers
60 views

Is the positive supply of Arduino USB port connected to 5V pin? [closed]

You can power the Arduino Uno/Nano using the following: Barrel Jack (for UNO only), it is connected to the input to voltage regulator. VIN pin, it is also connected to input of voltage regulator. 5V ...
1
vote
1answer
62 views

74hc595 sinking, not sourcing

I'm trying to get a sn74hc595n working with an arduino Due, eventually I will be hooking up each output to an NPN to drive Nixie tubes (I am switching my design from a due to using a esp8266 so I need ...
0
votes
0answers
26 views

EMG signal from MyoWare board - sudden increase in output voltage

I am using the MyoWare muscle sensor from Advancer Technologies (this one) to obtain EMG signals from my forearm. I want to use it in a project where I will be checking if the muscle is flexed or not. ...
1
vote
1answer
70 views

Driving a motor backwards and forwards using mosfet and Arduino pin safety

So I want to drive a motor from a handheld drill/screwdriver. And I have managed to get it going using the first schematics, and using pwm to control the speed. The Zener diode is there to protect ...