Questions tagged [arduino]
Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
7,646
questions
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22 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 ...
0
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2answers
26 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 ...
1
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2answers
60 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), ...
0
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2answers
77 views
Is it necessarly to use pull down resistor with BTS7960
I have Arduino nano controlling a BTS7960 that is 10 meters away, and i have one 24V power supply.
Both Arduino and BTS7960 get 5V through a LM2596 step down converter.
the BTS7960 Enable pins ...
0
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2answers
65 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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29 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 ...
0
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0answers
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
54 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 ...
0
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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 (...
0
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2answers
44 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 ...
2
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1answer
40 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 ...
0
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1answer
48 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 ...
0
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1answer
51 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 ...
0
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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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0answers
24 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 ...
0
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0answers
12 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 ...
2
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5answers
337 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 ...
0
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1answer
46 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 ...
1
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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-...
-1
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2answers
137 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'...
0
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1answer
41 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 ...
2
votes
2answers
77 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 ...
0
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1answer
46 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
votes
2answers
203 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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0answers
31 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 ?
0
votes
1answer
30 views
LE33CZ LDO 3.3V regulator output issue
I'm trying to understand why with this very easy schematic, I got with my multimeter:
5.2V between the 5V pin of the USB breakout and GND: OK
0V between the GND of the LDO and the GND of the USB ...
0
votes
1answer
37 views
DHT11 temperature and humidity pull up resistor
I am setting up my Arduino Due with the DHT11 temperature and humidity sensor. Most diagrams mention using a 10k ohm sensor. Is it OK to use a 5.1k ohm as that's what I have available?
1
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2answers
76 views
What are the general characteristics of a faulty Arduino UNO board?
I am building an Arduino based project with DS1307 RTC clock module and storing an offset value, rarely updated though, in its EEPROM. But I am observing drift in the time as well as the offset value ...
0
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1answer
34 views
Powering a stepper motor (on Arduino), what's too much and too little?
I'm an electronics noobie, just learning on an Arduino.
I'm following some tuts online, and bought myself an arduino and a 28byj stepper motor.
It's 5v DC.
I power the arduino via a 9v battery or via ...
0
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2answers
36 views
ESP32/ESP8266 external programmer two way design question
When I design a PCB that has a ESP32/ESP8266, I usually integrate a USB-UART bridge in the design as well. However, I am now working on a board that will likely have more than just a few copies.
The ...
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0answers
26 views
DSLR Hotshoe wiring to Arduino revisited one more time - When powering off the circuit, the flash always fires!
After correcting the false triggering I was getting in my last question:
DSLR Hotshoe revisited
It was related to debouncing the pulse sent from the camera to the flash, I noticed one more problem.
I ...
1
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0answers
32 views
How to determine the lowest bound of current sensor sensitivity?
I would like to build current logger using Arduino. I am having hard time finding out and understanding the lowest bounds of current sensor sensitivity.
The following link states sensitivity this way &...
1
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1answer
19 views
Controlling MG946R servo with 3.3v PWM signal
For a project we're building a robot arm, using three MG946R servos and one MG90S servo. Now I was wondering how to control those since I've been tasked with acquiring the hardware.
I think the MG90S ...
1
vote
1answer
48 views
DSLR Hotshoe wiring to Arduino revisited - I'm getting false triggering. How can I overcome that?
I read this post of 7 years ago:DLSR Hotshoe wiring to Arduino
I built the exact circuit described in the answer, shown below, to detect when my canon DLSR hotshoe would send a "trigger" ...
7
votes
5answers
1k views
Temperature sensor read out is influenced by LED
I'm trying to control some LED's (pins 2,3,4) with a temperature sensor. In the setup I do a calibration step to set the baseline temperature. When that's done, the LED at pin 5 is turned on.
Before I ...
1
vote
2answers
48 views
Not visualizing signal in oscilloscope when a speaker is connected
Hope you can help me with this, because I really don't understand what is happening.
I have the following electronic circuit.
The Arduino is generating a tone and I am changing the volume with a ...
1
vote
1answer
60 views
What is the correct way to to write unit tests for Arduino? [closed]
I am getting into robotics. I've read the book "Beginning Robics with Raspberry Pi and Arduino" by Jeff Cicolani and have ordered some robot parts and am getting ready to get my hands dirty.
...
0
votes
1answer
50 views
Motor impedance too high at 20kHz
I have an H-bridge I am driving with an Arduino Mega. The motors I am driving are fairly large, steady state 48 watts, maximum 300 watts. I am driving them at 16 volts and a switching frequency to ...
0
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0answers
25 views
What kind of antennas can I use for uBlox NEO -M8N-GPS module?
What kind of antennas can I use for ublox neo m8n gps module? Which antenna is more preferable this module? Would you please recommend an antenna?
For example;
1)L-KLS1-GPS10-0103000 - ANTENNA GPS
2)...
0
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0answers
32 views
Confusion about power source/supply on the STM32F103C8T6 Blue Pill
I am attempting to program and STM32F103C8T6 Blue Pill board using an ST-LINK V2 debugger, i have the 4 pins connected to SWDIO, SWCLK, 3.3V and GND, and then connected into the 4 pin header on the ...
1
vote
1answer
35 views
How can i generate a negative potential/current and alternate the pin-input between positive and negative potential/current using an arduino uno?
My goal is to make the barmagnet rotate by activating two coils and use both forces at the same time with an Arduino Uno. One coil should have a positive potential or current to attract the negative ...
0
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2answers
83 views
Arduino spuriously resets with power draw
I have a simple circuit, pictured below, that uses an Arduino to control two large bidirectional motors via 12V relays. Normally this works a treat, but sometimes the Arduino ends up resetting itself.
...
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1answer
78 views
Why is this relay circuit with an ESP32 not working?
I have set up a circuit as described in the picture. The circuit works so far, the ESP switches all relays and switches on the circuits.
The problem is that as soon as I connect the motor, which is ...
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0answers
20 views
Lora sx1278 implementation by Arduino Uno
I'm implementing a Lora network, with two SX1278 modules and Arduino Uno. Lora is based on three classes. A , B and C, The question is : for change For example A to B, what should exactly change in ...
1
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2answers
69 views
Is there something wrong with this irregular clock line (SCL) on I2C? ( Arduino board)
I am trying to get this ADXL357 eval board to work, in connection with either Arduino Uno or Due via I2C. Sometimes I get a connection and can read out data, however often there are problems with ...
2
votes
1answer
49 views
Solar load sharing for an MCU
I understand P Channel MOSFET operation and was reading this question which shows this circuit:
but I wasn't sure whether this can be used to load share with an MCU such as Arduino or ESP32 which ...
1
vote
3answers
96 views
5 V relay connected to Arduino
I have a 5 V relay module connected to WeMos D1 board. The load is a small electric cooker.
The code turns on and off the relay every 5s for testing purposes.
digitalWrite(pin,HIGH);
delay(5000);
...
3
votes
2answers
157 views
Anything wrong with connecting L298Ns in parallel?
Although L298Ns are very inefficient, they're very cheap. I have two motors that require 4A+ current at load combined. Can I connect multiple L298Ns in parallel in this way to increase the overall ...
0
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1answer
36 views
Using one DC motor driver for multiple motors that aren't going to be used simultaneously
I'm trying to control 20 DC motors with an Arduino but I don't have enough pins to connect all the motors simultaneously. I only need one of the motor running at a time. How can I switch between ...
