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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
4answers
3k 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 ...
1
vote
1answer
86 views

Reduce Noise Added With Zener Clipper

I'm working on a hobby Arduino project to create an audio visualizer using an LED strip. I'm using the MSGEQ7 to separate the signal into 7 bands, then send it to a Wemos D1 Mini. I started by ...
0
votes
1answer
99 views

Can an Arduino Pro Micro act as a USB hid and usb host device at the same time?

I know that the Pro Micro can act as a HID device. As far as I understand the Pro Micro can also act as a USB Host using a usb-host adapter (shield) - right? Now can the pro micro be both a device ...
-4
votes
0answers
32 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 ...
0
votes
2answers
48 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 ...
-1
votes
0answers
23 views

Don't able to program ATmega2560

I have developed custom PCB based on ATmega2560 microcontroller. I'm not able to upload code to ATmega2560. I'm using USBasp programmer and ProgISP to upload hex file. Programmer and ProgISP are ...
-1
votes
0answers
22 views

why L298N driving the motors properly on battery but not on adapter?

I am using Arduino, l298n, adapter(12v,2A) to drive the motor 12v,200rpm when I test the L298N by simply making high and low using jumpers the motor works fine but when I connect the jumper to the ...
0
votes
1answer
39 views

Operating AD5780 EVAL Board Via MicroController

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
1answer
183 views

Photodiode + OpAmp + Arduino: Further Amplification

In order to measure the concentration of a methylene blue dye in water, I am using a 660nm high power LED and a photo diode with op amp setup as described here. (schematic below): I have tried two ...
0
votes
1answer
92 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
1answer
98 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 ...
1
vote
2answers
46 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
1answer
89 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 ...
0
votes
0answers
46 views

Should I use Wifi or zigbee for remote stop go lights?

I'm working on a small project to make some remote stop and go lights, i would like to be able to easily add an extra Box to the system as and when i need it. The idea is to have red and green ...
0
votes
1answer
49 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
2answers
106 views

Arduino Geiger Counter

I have found somewhere the following scheme for an arduino based geiger counter. (The arduino main purpose is to count the pulses from the tube) As far as I can understand it, the transistor would ...
0
votes
0answers
39 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
0answers
28 views

my LM35 temperature sensor gives weird measurements, [migrated]

Board: esp32 I know my wiring is correct because I get data from the sensor, but the data is a bit weird. At 22 celcius I get 140, even though if I do the voltage calculation (* 0.473372) it still ...
2
votes
5answers
2k views

Controlling electric power steering using an Arduino to emulate torque sensor

I am trying to control an electric power steering rack with an Arduino. To do this I need to "trick" the EPS module that there is torque being applied when there really isn't. On the rack there are ...
0
votes
0answers
35 views

Video transmission using microcontroller [on hold]

I try to stream video using a microcontroller. I tried Raspberry and it was expensive and boot time was very slow (which is crucial for my project). I didn't try arduino because I assume it wasn't ...
0
votes
1answer
34 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 ...
0
votes
2answers
93 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 ...
-2
votes
0answers
36 views

What is the best choice of rechargeable battery for an arduino pro mini + SG90 + EMG sensor? [closed]

So, I am building a project that requires that an Arduino Pro Mini read out a value off of a DFRobot EMG sensor 10 times a second and then, when the threshold value is exceeded(approx. once every 5-10 ...
-4
votes
0answers
43 views

How to convert byte*payload to an int? [closed]

I am programming ESP8266thing dev board using arduino. I have a value stored in byte*payload. I want to convert that value and store it into an int variable. I tried different methods but non of them ...
-1
votes
0answers
47 views

Transistor array only working on breadboard! Why?? Not a PCB problem

I have a transistor array (ULN2004AD16-U). I put THREE arrays on a breadboard. I connected an arduino to base 1 and emitter. All three transistor work just fine. I took one transistor off the ...
0
votes
0answers
22 views

Unkown fuse on the UART-to-RS485 module [on hold]

Does anyone know what kind of fuses (name / item number of the manufacturer) are used on this UART-to-RS485 Module (This one) shown in the picure above?
3
votes
1answer
82 views

Transient Current Effects from Independent Charging Circuit

I've been working to automate a household appliance. The device is normally controlled by a switch that must constantly be depressed in order for the device to operate. Instead, I replaced this ...
0
votes
1answer
88 views

Switch module test circuit design

I am doing a project to make a test box that would to test the switch module in the photo below. Please see circuit diagram below for inside of the switch. Please note this switch is not an ordinary ...
1
vote
2answers
80 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 ...
1
vote
2answers
177 views

How to connect one pin to ground when an another analog pin is triggered

I'm trying to combine two working electronics projects into one. I have a standalone piezo sensor that I can read values from when it vibrates via an arduino, and I have a standalone audio board (no ...
0
votes
0answers
33 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 ...
4
votes
1answer
116 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
0answers
116 views

Arduino PWM successfully controls LED brightness but not electromagnet strength? [closed]

I'm trying control the strength of an electromagnet using an Arduino. I've included my circuit (sorry it's a Fritzing diagram, I'm working on the schematic and will update once it's ready) and code ...
-2
votes
0answers
22 views

Arduino PWM & MOSFET successfully control LED but not electromagnet? [duplicate]

I've got an Arduino circuit set-up so I can control the strength of an electromagnet using a potentiometer. My potentiometer is hooked to A0, and I'm mapping its value to PWM pin 3 which then goes to ...
0
votes
2answers
89 views

Measuring pendulum dynamics with magnetic field sensor

I've been working on this project which measures pendulum position and motion. Currently I use a 9-DOF inertial measure unit (IMU), like that used in this project/question. The method works very well, ...
0
votes
1answer
96 views

How is interaction with CDC device with no interface endpoints working?

I'm working on uploading to Digispark board. It uses micronucleus bootloader and i can see uploader code. I've modified it a bit to see interfaces and endpoints count: ...
0
votes
1answer
83 views

Proteus fast delay scanning problems 8x8 led

So im practicing shift registers. Im trying to draw a Smiley Image in the 8x8 LED. At first, it was okay because I set the scanning delay to 1 second. but in reality, this must be set to a faster ...
0
votes
2answers
63 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
6answers
15k views

Excessively high temperature reading with LM35

I am really new to electronics and I am just experimenting at the moment with a breadboard. My question here is related to the LM35 temperature sensor and Arduino micro controller. I am getting a ...
0
votes
0answers
43 views

how to speed up sms arduino? [closed]

I am using sim800l to send SMS using Arduino to send an SMS it takes around 5 seconds because of the 1-second delay between AT commands. is there a way to speed up sms process ? or reduce this delay ...
-5
votes
0answers
36 views

above under water drone [closed]

building it for senior design project. I am using flight controller with gps https://www.robotshop.com/en/catalogsearch/result/?q=drone+Flight+Controller&order=relevance&dir=desc tracing ...
0
votes
2answers
40 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
0answers
79 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'...
2
votes
2answers
106 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 ...
0
votes
3answers
56 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
0answers
28 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 ...
4
votes
3answers
2k views

Reverse engineering old serial devices and cloning with Arduino

I have a piece of music equipment that uses a remote control. This remote control communicates bi-directionally with the main unit. It communicates over RS-422 protocol (mainly for the cable distance, ...
1
vote
1answer
65 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
1answer
90 views

LED strip driver using Standalone atmega823 and MOSFETs

I want to make a LED strip driver, using an atmega328 on a custom PCB. I was able to get it to work perfectly using an arduino UNO, with the mosfets connected on a breadboard. However, when I just ...
15
votes
5answers
12k views

Scaling Voltage for Arduino Analog In, Beyond Voltage Dividers

I've recently built some fiber-optic bend sensors and I want to read the values I get from them into a computer via an Arduino. I'm measuring the light with this photodiode from Industrial Fiber ...