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Questions tagged [electronics]

Use this tag to ask about electronics-related issues with your Arduino. For example: driver transistors, Ohm's Law, current-limiting resistors.

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0answers
30 views

How to get ppm value from MQ sensor?

I am using both MQ-6 and MQ-7 to detect CO and LP gas but i have no idea how to convert from voltage to ppm. I have the range for the ppm but how do i convert to voltage and vice versa The range i am ...
0
votes
0answers
19 views

Internal Impedance of the Arduino Uno + Servo Motors?

Project Background: We are trying to create a dual-axis solar tracking device that can power itself. However from my background knowledge, i know that the load impedance has to equal the power ...
0
votes
0answers
33 views

Interrupt False triggering

Greetings of the day, i have been working with embedded systems for quite a while now, currently i am working on a project that dispenses water depending upon the balance from rfid card, however the ...
0
votes
1answer
13 views

Adding POE to Ethernet Board

If I was to use the Arduino A000024, would I be able to add a POE MODULE to the board to get a Ethernet board with POE to run my arduino project?
0
votes
1answer
27 views

how to control electric strike fail secure using arduino to secure a large box? [closed]

I wanted to use a electric strike fail secure lock to secure a box. Is it a good idea to use a electric strike or is there any better locking mechanism to secure the box?
2
votes
2answers
56 views

Arduino UNO socket

As I learnt so far is that Arduino UNO board has a socket for power input. The available power input range is between 7V - 20V, but the optimal usage range is 7V-12V. Here I am wondering: ---> if ...
0
votes
1answer
62 views

Garbage stored in SD card

I am an electronics graduate and an embedded design engineer, working in this field for about two years apart from the hobby time during my graduation. I am currently working on a system that has an ...
0
votes
0answers
27 views

What happens when using a different resistor? [duplicate]

I want to do this project which calls for a 220Ω resistor. It's pretty basic, controlling an LED with a Bluetooth. I have 100Ω and 330Ω resistors. What would happen if I used either of those? Would ...
0
votes
1answer
46 views

Help me determine the power consumption/rating of the circuit below? [closed]

Please help me determine the circuit's power consumption from the battery and help me outline the steps to calculate?
1
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2answers
46 views

Powering Atmega328P-Pu externally [closed]

Please I'm new to Arduino and I need assistance. I'm working on a project which makes use of the ultrasonic sensor to make a certain pin high if a certain distance is attained. When I used the USB ...
0
votes
2answers
35 views

Schematic interpretation, where to put resister?

I'm new to schematics, trying to figure out where to put a resistor (no instructions other than the schematic) I'm told I need: 10K variable Resistor x 1, 4.7K Resistor x 1, 100 Resistor x 1 But I ...
0
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0answers
21 views

My 1604 LCD is bright with USB power but not when powered through the jack

I'm making a bench PSU. The Arduino runs off the purple 5v standby. The Mega also powers 2 LEDs (normal 5mm clear). The thing is, when I upload the code and watch the screen go through the process, it'...
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votes
1answer
58 views

l need to generate clock pulse with 30 Mhz using arduino? [closed]

l need to generate clock pulse with 30 Mhz using arduino ? using clock pluse to programming 32-1 multiplexer using arduino
0
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0answers
36 views

Can I output the movement(steps has done or degrees) of a stepper-motor that i manualy turned his axis?

I'm thinking for a project that involves a stepper motor; What I want to do with it is if I can somehow output the steps that has done when I manually rotate the axis ? I want to record that value ...
0
votes
2answers
201 views

Can I simulate a clock without an RTC connected? [closed]

I want to program for a timer that works as set timer such as in an oven where user can set their own time. One of the way I know is using an IC(RTC) for the timer. However, I don't have the IC yet ...
0
votes
1answer
65 views

Capacitors, Arduinos and Saving Data

In short, I have programmed and wired a speed/odometer and all is working well. However, I need to save data from the components/sensors once a power button is pressed, which has led me down the road ...
1
vote
1answer
51 views

Arduino program has suddenly stopped updating

I am writing a speedo/odometer program which was all working beautifully until I introduced an LCD screen and code for the LCD. The screen works on power up, displays the distance recorded on an SD ...
0
votes
1answer
52 views

Rc receiver giving wrong values when controlling servo

So I'm building a helicopter. That why I need a receiver (tgy 9x) to read the values from my controller. Those values get passed to my Arduino due where some calculation happen and then get sent to ...
1
vote
1answer
66 views

Arduino + Solenoid Lock

I was trying to use a solenoid lock alongside the arduino, using a 12V 2A DC adapter, TIP120, and a diode. The circuit looks something like this. However, the lock isn't going in automatically (it ...
1
vote
1answer
34 views

Formula to calculate energy required to power an Arduino board

Given an Arduino board with the following specs: ATmega328 Arduino Nano AVR® ATmega MCU 8-Bit AVR Embedded Evaluation Board (link) What is the mathematical formula to calculate how much energy/power ...
0
votes
1answer
59 views

Problem in bootloading 328p using Arduino as ISP. Please help me in figuring out the problem.I have uploaded the verbose below

Arduino: 1.8.3 (Windows 10), Board: "Arduino/Genuino Uno" C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -...
0
votes
1answer
53 views

Can someone help me with my arduino and relay and switch?

This is my code. What i want to do is activate the relay when switchInNcPin is activate. I am using a switch (micro switch). It has COM NC and NO pins. Can you tell me what is wrong with my code? ...
0
votes
1answer
100 views

Readings changing in hall effect sensor

I am using a A1324 hall effect sensor for a distance measuring. The voltage output keeps changing even if the distance between the magnet and sensor does not change. The output changes +-0.200V and I ...
0
votes
2answers
102 views

Need help with understanding the CapacitiveSensor circuit diagram

Hey guys I need help with understanding the circuit diagram from this link: https://playground.arduino.cc/Main/CapacitiveSensor?from=Main.CapSense As of now, this is the schematic I drew from what I ...
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votes
2answers
2k views

Arduino UNO reset using SIM800L [closed]

I'm using the SIM800L module but i've problems. I'm triying to connect it to the Elegoo UNO i've, but it restarts at all times. Also the led of signal strengh blink every second, so i dont get signal. ...
0
votes
0answers
45 views

Need help with Arduino Love-O-Meter

not sure if this is the right place to post, but basically I am trying to make a Love-O-Meter, similar to the Arduino project example. However, my method of determining the score is different. ...
0
votes
1answer
46 views

Designing around Output pin limitations

I'm new to Arduino and am working on a project with my son. We are using the LillyPad USB board (schematic) to drive a bunch of LEDs (LED Datasheet). Our project is based loosely off of the 'Turn ...
3
votes
4answers
233 views

Why would the resistor be after the LED in this project?

This is project 2 of their official arduino projects book called "Spaceship interface". I understand resistors normally reduce voltage so the LEDs don't burnout but here 5v is coming from either ...
-2
votes
1answer
58 views

Power supply for a set of components for IOT smart switches [closed]

I am trying to build my own IOT smart home and as a first step, I used the following components to build a module to control ligts and fans: Atmega 328P - to control the 8 module relays NodeMCU - ...
6
votes
1answer
1k views

Why connect a diode between the reset pin of Arduino and 555 timer?

I am trying to create a watchdog timer using 555 IC and I am following this. I do not understand why a 1N4148 diode is connected between the reset pin of Arduino and the output of the 555 timer. As ...
0
votes
1answer
482 views

ESP8266 as wifi Card? [closed]

I am very new to arduino and electronics in general. Can i use the NodeMcu Esp8266 as one of those usb wifi dongles? I want to use it as a monitor mode capable wifi card, for my linux laptop.
2
votes
3answers
98 views

What is the most Inputs on An analog Pin with a specified Accuracy on the Resistors Used?

I am asking about the technique were switches and resistors in series are used on the analog pin, so it creates a voltage divider when one of the switches is pressed, it a well known technique it is ...
0
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3answers
195 views

Battery life calculation using Nano, NRF24L01+ and window magnetic reed switch

I'm trying to make my own home wireless security system. I will be using probably 3 AA batteries to power these devices. My problem is that I need to know if the batteries will be enough to power ...
1
vote
2answers
395 views

Is it possible to increase the voltage on 3.3v output to 5v on an ESP board to power a DC motor? [closed]

I am trying to use an ESP32s controller connected to an RC car DC motor. I found that when using my Arduino this is easily accomplished, and I can see that my output pin produces 5v for the motor to ...
0
votes
2answers
77 views

Unable to read data with 16 serial clock cycles

I am trying to read data from an AD7314 Temperature Sensor that is connected to an Arduino Uno and output that value onto 6 LEDs also connected to the Arduino Uno board. From the image below, the ...
3
votes
2answers
136 views

Weird Voltage Noise

I'm new to this forum, so hello to everyone out there. So I have an Uno with A0 connected to the positive end of a chain of LEDs (they light up when a motion sensor goes off, clunky, but it works), ...
0
votes
1answer
527 views

SPI Temperature sensor interface with Arduino Uno

I want to interface with an AD7314 Temperature Sensor. I want to only read the temperature value from the sensor and output the value on to 8 LEDs connected to the Arduino. But so far I have not been ...
0
votes
2answers
243 views

How the output of a bicycle dynamo can be displayed using Arduino?

I am on a project in which I need to make bicycle dynamo frequency meter. The power generator’s output should vary with the speed of the wheel. Which parts do I need to make it work? The project ...
1
vote
1answer
22 views

Is it right to connect Serial module directly? [duplicate]

I find a strange thing that the led is on when power is off. And it's the problem of my serial module. Arduino may get power from my serial module. My serial module use max2322. I don't if it will ...
0
votes
1answer
256 views

connecting 4 wire camera to esp8266 [closed]

I am looking for the arduino code to stream video to a webpage using the ESP8266. here is the 4 wire camera I have: https://www.ebay.com/itm/172272466793 The other tutorials I'm finding online are ...
0
votes
0answers
181 views

Use mobile charger as power suppy to ESP8266 wifi module with 3.3v converter

I am using this FTDI connector to power and flash code inside ESP8266 module. Now I am done with adding code to ESP8266, now I just want to power it. but when I connect the mobile charger(5v output) ...
0
votes
3answers
1k views

Unable to receive and print SMS on the serial monitor with Arduino Uno and SIM900A

I'm trying to receive an SMS and show it on the serial monitor. My code is as following: void setup() { Serial.begin(2400); Serial.write("AT+CMGF=1\r"); //set GSM to text mode ...
0
votes
0answers
46 views

Summing stereo signals with seperate readings

i would like to sum several several stereo-jacks to a mono-cable AND be able to read the inputs of every stereo jack separately on my arduino. How do i seperate those readings while summing the audio ...
1
vote
1answer
97 views

Water flow sensor unable to get readings

I connected my "arduino(nano)" to "water flow sensor" and wrote a code which simply prints the readings like 0-1023 and tested it. First i got the readings but now i'm not getting it. My code looks ...
2
votes
0answers
38 views

check if a fuse is good or bad in an ac circuit using arduino [closed]

I have a fuse in a ac circuit of which i want to check if the fuse is ok or not. I'm wishing to wire up two nodes of the fuse holder and determine the fuse status. I have a plan of notify user if the ...
0
votes
1answer
1k views

DHT.h Library not being imported

I am trying to read the humidity and temperature using a DHT11 temperature sensor for an Arduino UNO using the DHT.h library. I have my code below: #include <DHT.h> #define dataPin 4 dht DHT; ...
0
votes
2answers
65 views

Power Measurement

I am trying to develop a system that reads the amount of power consumption from my load. Here is how my setup looks like; The led represents a 5W and 12V light bulb(I was unable to get this in my ...
0
votes
1answer
436 views

How to calculate voltage from A0 pin

I would like to calculate the amount of voltage from my A0 pin. I am using a 9v battery to power my load in my circuit. The formula to calculate voltage from the A0 pin is: sens = analogRead(A0);...
0
votes
2answers
534 views

Can you use an input pin instead of ground in Arduino circuitry?

Beginner here: Would the circuit in the picture work or do input pins not absorb the energy as ground does? I know setting the pin as an input makes the direct 5V connection safe but maybe I'm ...
0
votes
2answers
157 views

Analog output low voltage issue, how to troubleshoot

I have connected my arduino according to the schematics in the image, with a few additions. The setup A DC motor (water pump) drawing power from Vin, going to ground via a transistor based in A0 ...