Questions tagged [arduino]

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MAX31865 Over Voltage/Under Voltage Fault Caused by Noisy Environment

I have 4 MAX31865 RTD temperature sensor IC's using 3 wire PT100 sensors in an electrically noisy environment. I used an isolated DC-DC converter (SPBW03F-03) in hopes to isolate the measurement ...
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Controlling RGB LED strip with transistor

So I am building 7 segment display with RGB LED strip. To power it, I was thinking of 1 transistor on the input and 3 on the outputs. And my question is: Could I be controlling all 3 of the from one ...
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How to make a circuit using an Arduino where I can control LED to move from left to right and vice versa using an MPU6050? [closed]

How can I make a circuit using an Arduino where I can control LEDs to move from left to right and vice versa using an MPU6050? Is it possible? I am new to Arduinos and coding.
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Active pullup on one-wire network

Can anyone suggest an active pullup circuit to replace a typical pullup resistor for an arduino one wire network of ds18b20s? I have 80+ meters of network in a daisy layout of 12 sensors. I've reduced ...
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2answers
123 views

How to measure very low current by amplifying it?

I am trying to measure current from a DC circuit. So it basically I am trying to make an ammeter. I am using ACS712 20A current sensor and Arduino UNO. Theoretically, I can measure a minimum of 50 mA ...
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MCU, N-channel MOSFET, ~15m led strip, 24V power supply. Whats happening?

Disclaimer Hi, Firstly, I'd like to underline, that I do not have masters degree from electrical engineering and I didn't study electrical engineering on high school. I'm software engineer who likes ...
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15 views

Potentiostat measurements not syncing with main control board

I have quite the perplexing issue I was hoping to get some help with troubleshooting. It involves communication between an Arduino AtMega2560 board that both commands a potentiostat (built using a ...
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2answers
32 views

Am I measuring the Op-amp MCP6004 IC output voltage correctly using Arduino

Right now I am testing an MCP6004 Op-amp IC. A sensor in my main circuit going to give me a signal in the range 0-0.5 V max. So, I want to amplify this in the 0-5V range so that my Arduino reads it ...
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Power supply of 5V 1A causing erratic behavior of Tower Pro SG90,- what's the reason for this? Also occurs when using the MB102

I need to power an SG90 servo but am having trouble with erratic behavior when using a phone USB charger of 5V 1A or when trying to use the MB102. The MB102 voltage regulator also overheats within a ...
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1answer
73 views

Does “rated torque” (kg.cm) directly apply to “lead screws”? [closed]

I am making a project that requires driving nuts through threaded rods. I keep seeing different numbers for kg.cm and N.m, the explanation kg.cm found on this Stack emphasized only on radial distance, ...
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1answer
35 views

Do STMF411 boards have a problem with the D+ pull up resistor?

I found this webpage that mentions problems with the ("blue pill") STM32F103 boards. The problem is that the value of pull up resistor on D+ is wrong. Do the ("black pill") STMF411 ...
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25 views

Setting a timer on Attiny1604

My goal is to generate timer interrupt on Attiny1604. I don't need a specific frequency right now, I just need to understand the inner workings and get it under control. I will be using the 16-bit ...
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1answer
46 views

DC motor won't spin with PWM unless touched with hand, and other hand touches “ground” from metallic cabinet

I'm using the common L298N motor driver module with an Arduino Uno to control one 12V DC motor. The motor will not spin unless I clutch it in my hand and with another part of my body, touch what I ...
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1answer
77 views

Logical Bitwise Operations Problem

I am reading data from an IR sensor array (8 sensors) and converting the ADC result to binary via a set threshold. If n is the current result, for example: (N.B: n-1 is the previous result) ...
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How to drive 700mA LED cheaply?

I'm new to electronics and am trying to make a night vision circuit. A similar question has been asked before, but with priority on efficiency. I want to control a 700mA-1000mA IR LED using a 5v input ...
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29 views

Calculating NTC temperature on Controllino Maxi Automation yields incorrect temperature

I'm using the analog input on the Controllino Maxi Automation to determine the temperature of a 10K NTC thermistor. At first we thought it was a self heating issue given that with 24V the current ...
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1answer
91 views

What does a 'scaling factor' mean for an ADC?

I'm using the analog input on the Controllino Maxi Automation to determine the temperature of a 10K NTC thermistor. I'm having some difficulty understanding how the ADC works. On a regular arduino ...
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41 views

Logging and retrieving large bursts of sensor data from an Arduino

I was wondering, if I put an Arduino with a few sensors on let's say a water rocket to track acceleration and height and what not, how would I save this data? I'm assuming that I want to have a high ...
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41 views

200 Input Smart Multimeter Project

First off, thanks for taking the time to read this and help out. Here's a quick overview of what I am trying to design. I have a break out box that has 200 female probe inputs. Each input is numbered, ...
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1answer
80 views

How to tell correctly if a circuit is pull-high type or pull-low type?

I have been giving this assignment working with Arduino that would light up a 7-segment component, when a push button is pressed. Is there an intuitive way of looking at the circuit and recognize ...
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18 views

Issue using TCC3 of microchip SAMD21J in variant file

I am writing variant files for SAMD21J/G/E. I am unable to use TCC3 of SAMD21J/G/E in Variant.cpp for arduino IDE. If it is used Arduino IDE shows error TCC3 undeclared variable whereas, all other ...
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1answer
24 views

How can we use a touch sensor to detect a specific object like a biometric fingerprint sensor?

I have an Arduino connected to a touch sensor which is placed below a piece of 4mm thick glass. I can use touch to turn and send signal to the Arduino. I'd like the sensor to only detect a specific ...
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1answer
164 views

Dual control an output with a MCU's GPIO and a capacitive touch button (TTP223)

I am a newbie in this electronic world and English is not my first language, please be sorry for any inconvenience I may create. It was a long story for me to come up with this writing, let get a bit ...
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28 views

IR Receiver Module with Arduino [closed]

As part of a first-year engineering project to build an autonomous prototype we are using and IR circuit. We are using the XC-4426 IR source and its partner XC4427 receiver module (both Arduino ...
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34 views

SMBus ARP working example

I've been playing around with an arduino and a few sensors when I came across this amazing communication protocol I2C with which a master can communicate with all of the sensors (or slaves in a more ...
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2answers
38 views

Inappropriate readings of pulse and temperature sensor (LM35)

I am facing quite a bit trouble with an LM25 temperature sensor. The readings are a bit too high (90-120*C) for room temprature. I have tried thefollowing things to get an expected result but none ...
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2answers
67 views

How does an MCU detect current drop in an active-low button?

I'm confused as to how an active-low push button detects a change in voltage. Below is a model of a conventional setup of one of these buttons I found. When the switch is open (like in the image), ...
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2answers
150 views

Is it necessary to use a pull down resistor with this BTS7960?

I have an Arduino Nano controlling a BTS7960 that is 10 meters away. I have one 24V power supply. Both the Arduino and the BTS7960 get 5V through a an LM2596 step down converter. The BTS7960 "...
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2answers
68 views

Can I plug in too many LEDs (i.e. 26) on Arduino UNO?

So, I know Ohm's Law and that Arduino UNO R3 pins (digital 2 to 13) have a rated maximum of 40 mA, although it's better to consider that they have a maximum of 20 mA for safety reasons. If I put 2 ...
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30 views

Trouble with ESC & Brushless motor

I'm new in this group, I hope to be welcome and help you whenever i can. At first i need your help... i'm assembly a drone ( quadcopter ) , and testing the ESC with the motors, and i have issues. I ...
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53 views

Testing DC Motor with a Torque Wrench

How can I measure the torque of a stalled DC motor @ 6V using a torque wrench? I'm trying to test my DC motor with the torque wrench method (regular torque wrench used for cars). Any guidance helps. ...
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1answer
55 views

Arduino transistor switch

I'm building an Arduino switch for two different signals and I'd be very grateful if you can revise the schematic and tell me if there's something wrong or if something can be improved. In the ...
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1answer
35 views

DRV8825 Stepper Driver Burning Up

I am trying to wire up 3 NEMA 23 Steppers driven by 3 DRV8825 drivers and an Arduino Due. I tried to solder a perfboard prototype, but when I turned it on the first board burned and the ground jumper (...
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2answers
45 views

How can one determine the pulse width of a servo motor?

I have recently started to fiddle with an Arduino UNO R3 kit I bought some time ago, and I got so hyped that I have decided to build a robotic arm. This robotic arm which I found on Thingiverse ...
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1answer
42 views

LCD prints black text on blue screen, but can print white on blue when bugged out

I am using the esp8266 which can supply 3.3V to power on an LCD 16x2. However, I am running into trouble regarding the visibility of the LCD's contents. The LCD prints black text on a blue background ...
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1answer
49 views

Is there a way to utilize a old screen using electronics that can be handheld?

So, I guess this is a follow-up question to my previous one: Is there a way to output high quality pictures to a monitor with VGA using an Arduino?. Obviously, the answer did help me to get rid of the ...
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1answer
52 views

Arduino based EEPROM programmer acts weird

I use an Arduino Mega to program an AT28C256 by using this code [1], but there is a weird issue! The Arduino's pin 41 is connected to the AT28C256's pin 16 which is I/O 4. It works without any problem ...
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1answer
46 views

How to fix an overheating Arduino nano?

I have an Arduino Nano and when I power it either via USB or VIN it heats up very quickly. Before it started to overheat I heard a spark but didn't see which pin sparked and I think that's the problem....
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25 views

Can't connect SSD1327 I2C

I just recieved 2 OLED displays SSD1327 128x128 16bits, 1.5", but I can't connect them to my arduino uno R3. I first tried with the Adafruit library, set the address 0x78 as printed on the ...
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13 views

My Lora adafruit feather m0 won't send join request

So, I got a new LoRa module from Adafruit called Feather m0 (900MHz). I tried running a modified example code, but could not send a "join request" to the live-server. I haven't really ...
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5answers
353 views

Why is my PWM efficiency about 50%?

I'm using a BTS7960 module with an Arduino to adjust the voltage for my DC motor. When I check efficiency there is a problem. PWM efficiency is supposedly about 90% but mine is only about 50%. I ...
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1answer
51 views

Is powering a 12v DC motor with 11.1 volts a bad idea? (3 * 18560 battaries)

I am working on an Arduino project where I will be controlling 4 individual 12 volt, 0.71 "Direct Current" DC motors, the arduino will be separately powered with another power supply. I'm ...
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0answers
42 views

Is it possible that a 12V transformer is creating EM interference that's coupling onto a long antenna cable?

I have an Arduino Mega, Adafruit RFM96W 433MHz LoRa Transceiver Breakout and 2 Channel OptoCoupler Relay Module. https://www.adafruit.com/product/3073 https://www.amazon.co.uk/SUNFOUNDER-2-Channel-...
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2answers
140 views

How to convert NPN transistor to PNP transistor? [duplicate]

I am making a circuit using a 4 pin hall sensor with arduino. It turns out that the hall sensor outputs a negative voltage as output, which arduino cannot read, so I will need a PNP transistor, I don'...
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1answer
52 views

How to use the enable Pin and Error Flag Pin of MIC29301 12V regulator with an Arduino

I am completely new to electronics and I am looking to implement a simple 12V Vacuum Pump power and control circuit with an Arduino. I chose the MIC29301 as the 12Vout regulator to be directly ...
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2answers
80 views

Is there a way to output high quality pictures to a monitor with VGA using an Arduino?

So, I had a spare monitor lying around and I wanted to find a way to make it like a picture slideshow. I also have an Arduino Uno. I was wondering whether there is a way to take some pictures from an ...
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1answer
48 views

Simplified Electrical Impedance Tomography (EIT) setup

We are working on a setup to measure the terminal settling velocity of objects (spheres, metal, for example) in a vertical tube filled with some sort of fluid (Mud, water, etc.). Preferably, we want ...
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0answers
72 views

How to get an old beer sign to work again?

Has anyone tried to upgrade an old beer / cigarette sign before? I'm a total electronics noob, and I got my hands on one of these old Coors signs that has a 45x7 LED display board. The board has what ...
2
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2answers
206 views

Will this circuit manage to kill a 2-stroke engine?

I'm currently building a project that involves a 2-stroke engine. I have tapped into the wires where you would normally place a kill switch in order to get power for some electronics. The voltage is ...
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33 views

How can we find the time from a digital clock and do a read? [migrated]

I have a digital clock i bought online.it displays time and calendar and has buttons to change the lights.i need to connect the clock to an arduino and read the time from it.How can we achieve this ?

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