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Questions tagged [arduino]

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

1
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0answers
47 views

ATmega32 changing the supply voltage during runtime

I'm currently designing a circuit which involves having the ATmega32 change its own digital supply voltage (from 3.3V to 5V) by sending a high signal through one of its pins. What happens during the ...
0
votes
2answers
74 views

Increasing current in an Arduino circuit?

I'm trying to power a small electromagnet using my Arduino Uno, but when I use the 5V pin, the current flow is not enough and the electromagnet ends up being a lot weaker than it is with a regular 1....
0
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1answer
96 views

Connecting 7-segment display to microcontroller

In the above circuit, what is the reason of connecting transistor to 7-segment display? What's the difference between the two display with transistors and other two with only resistors? Also ...
1
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2answers
43 views

Batteries not supplying enough voltage in DC motor circuit

I'm building a MOSFET controlled DC motor circuit with a 6V battery as the supply. Although when I turn the MOSFET on, the voltage at the battery positive drops to about 2.5V. I thought it could be ...
0
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0answers
27 views

Parsing Data and Comparing two string in arduino [migrated]

I am working on my final assignment. The problem is I want to make a prototype tool, with 2 string compare. If I send data "OK DISC DISCLOSED: 341513DB689AOK RSSI: -056 OK NAME: CarBT1 OK DISCE" will ...
2
votes
2answers
95 views

Cause of background buzz in my walkie talkie example? [closed]

I got a simple RF24Audio walkie talkie example working. I'm using the sketch file provided by the RF24Audio getting started example: https://github.com/nRF24/RF24Audio/blob/master/examples/...
2
votes
1answer
61 views

Simulate capacitive touch

I am using an Arduino Uno and would like to simulate a capacitive tap with zero human contact on my iPhone 5 screen. What seems to work right now is putting a coin on the screen and connecting the ...
0
votes
1answer
66 views

Connect 5V straight to resistor straight to ground

I'm very new to electrical engineering in general and picked up an Arduino recently. I have a couple questions: What will happen if I short 5V/3.3V/Digital pin output directly to ground? Will it ...
0
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0answers
65 views

inverter circuit

My inverter only produces about 8 volt output while the supply is as high as 20vdc, what's wrong with my inverter circuit ? ...
0
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1answer
30 views

Sharing a HD44870 display between multiple controllers

I have an existing third party system that has a HD44870 compatible display used for output. This third party system cannot be changed (for a variety of reasons), and I need to retrofit a device to ...
0
votes
1answer
51 views

Best way to shift automotive logic to Arduino TTL

My vehicle ignition switch voltage is 9V when the vehicle is not running. It is 6V when button is pressed. I need a way to convert this to TTL Arduino digital logic levels. I thought I could use a ...
-1
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2answers
95 views

N-Channel MOSFET: Gate keeps the source-drain open even when it gets a “LOW”

I’ve got an Arduino MKR1000 that I’m trying to connect to a 4-AA battery pack, a RFP30N06LE 30A 60V N-Channel Power Mosfet and a push button. My goal is to have the MCU program run once at each push ...
4
votes
2answers
99 views

Connect LM311 pin 7 to input pin Arduino

I'm brand new to the world of electronics and not very talented, so have mercy. This circuit lights up a LED when an IR beam is broken: I was wondering if I could connect the input pin of an ...
0
votes
0answers
32 views

How to Send s.bus signal from an arduino

i cant seam to find much for what i want on google. Im building a custom control panel for one of our wireless cameras, i can control it via S.BUS. just wondering if there was a way i can send an s....
0
votes
1answer
39 views

Problem with Bluetooth read range for arduino project

I have been working on an Arduino project for a door entry system in my business office but have encountered a problem. I have a group of 8 working in my office but we have a room which only 3 ...
0
votes
0answers
56 views

Is it possible to upload an arduino sketch through the serial port (RX) instead of USB [migrated]

In another words, is it possible to develop a custom bootloader so sketches can be uploaded via serial connection made using the RX/TX pins and not via the USB connector (I am using Pro Micro boards)? ...
2
votes
1answer
49 views

WS2812B LED Strip Not Drawing Full Amperage

I recently purchased one of these LED strips. Now I have read all about how these are notoriously known for drawing a lot of current from its power supply so I bought one of these power converters ...
0
votes
1answer
94 views

I want to discharge a capacitor with an Arduino digital pin. Which of these two circuits is safer for the board?

I have made a capacitance meter with a 555 timer and an Arduino. It's mostly complete except for the digital pin that triggers the 555. I have narrowed it down to two possible solutions. Both of them ...
0
votes
1answer
55 views

Is it possible to install `tcpdump` on an Arduino 101?

Currently architecting a side-project idea I have that requires tcpdump on an Arduino 101. This will be my first project and just wondering if this is possible or ...
0
votes
2answers
44 views

switching sensor output between two arduinos

I'm relative new to electrical engineering, so this might be a obvious question. I'm trying to allow two arduinos to communicate with one i2c sensor. One of the arduinos is deeply integrated within ...
5
votes
3answers
5k views

How do I measure a voltage greater than 5 V with Arduino? [duplicate]

I want to measure a varying voltage with an Arduino and real time data plotting has to be done. But the supply voltage will be 10 V and the Arduino is not supposed to have more than 5 V. Is there a ...
0
votes
2answers
40 views

Connecting an Arduino to Raspberry Pi

I'm trying to connect an arduino with 3 sg92r servo motors on it and an RPI with and lcd and the serial of the arduino connected to it. They are both connected to a power supply with 9v/1A and 5v/2....
0
votes
0answers
6 views

Can I configure pairing for HC-05 and Arduino, and use the HC-05 without Arduino after? [migrated]

I have a system that is outputting data via its serial, and I need to relay that data to my PC wireless-ly. If I were to setup an Arduino and HC-05 at the system's side to relay the data, that would ...
3
votes
3answers
99 views

Arduino analog input read peak-noise

I am using the NRF52832 and code it with arduino. I am reading A0 to get a signal from a sensor at 1m cable length. simulate this circuit – Schematic created using CircuitLab If I disconnect ...
0
votes
0answers
39 views

COG PFC2119x driven LCD Display: Add custom characters, can get it to work

Story (skip if you want) Last week I received two malfunctioning DAB radio's from the 'brand' Tesco (type DR1551W) for free and because I cannot fix the problem with these units (missing service ...
2
votes
0answers
48 views

Simplifying this circuit using optotriacs?

I'm currently trying to create an interface between my Arduino-compatible (NodeMCU) and my OpenTherm boiler. OpenTherm is a protocol used by some boilers (mainly in Europe) which allows for the ...
0
votes
3answers
101 views

Model railway Arduino control

I'm helping my dad build a model railway and unfortunately he doesn't have the space to build a full oval for his trains to run around, so we've built a u-shaped track for them to run end to end. I ...
0
votes
4answers
141 views

How to connect multiple 0402 leds to an Arduino for a 1:87 model

I want to replicate lighting a 1:87 scale police car with the aid of an Arduino Pro Micro ATmega32U4 powered by a 90mAh 3.7V LiPo which is connected to a TP4056 5V Lipo battery charger which is ...
0
votes
0answers
28 views

Arduino with 2 load cells (3 wires)

I'm new with load cells, and I have problem with my project, using 2 load cells with 3 wires is hard to get reference, many people using 4 load cells with 3 wires or using 4 wires load cells, can you ...
0
votes
1answer
58 views

Small DC voltage boost without step-up boost circuit?

I have a simple DC circuit (Arduino related) with a USB power supply that's giving me 4.9V. Is there a way, with minimal components and without using an inductor, to boost that voltage to 5.2V? I ...
0
votes
1answer
48 views

Arduino output states

I'm using 2 ultrasonic sensors to reverse the direction of a ram using a couple of relays to reverse the polarity. Basically when the head of the ram comes within range of one sensor it switches the ...
0
votes
1answer
60 views

LM35 temperature sensor strange behaviour

I have a set of LM35 temperature sensors hooked up to an Arduino. I find it hard to believe all 3 sensors are broken. The Arduino code is very simple. ...
1
vote
1answer
51 views

How to find current through series of potentiometers, and if it is safe for potentiometers? (Arduino)

I have 9 potentiometer with the specs: 10k Ohms and 0.5W I'm using an Arduino Mega, and using it's 5V port output to power these potentiometers in series, and I saw online that the max current this ...
0
votes
2answers
80 views

Can I use AA Duracell non-rechargeable in parallel?

I have never used non-rechargeable AA Duracell in parallel. I now have an application where I am forced to use batteries. To increase battery capacity I am thinking of connecting AA Duracell in ...
0
votes
2answers
43 views

Is it appropriate to use the TB6621 or DRV8871 motor driver for powering 12V 1 amp motors?

I'm looking to make an Arduino powered rock crawler with 4 motors (want independent control of each wheel, also need to reverse). I'm looking into buying 12V DC motors that seem to have about a 1A ...
0
votes
1answer
46 views

switching air valve with Arduino Micro

Good people of stack. I am a programmer, but new to building my own electronics. I need to switch (3) 12v solenoid valves from the Arduino Micro. I see lots of chatter online, much that confused me ...
0
votes
2answers
55 views

Powering Multiple Arduino Nano

I'm looking to power 5 Arduino Nano devices and an Uno. I'm wondering if I can power the devices with one power supply. I know that I'll need to use the VIN pin with 7-12v since the 5v will be used ...
-1
votes
3answers
75 views

How can I increase the AMPs in a transformer less power supply

I am very new to electronics and trying to do something which I am not much aware of yet. I have a NodeMCU (based on esp8266) for which I need power supply of 5V and it required I guess more then ...
0
votes
1answer
37 views

How to read multiple sensors, store into an array, sort and then do something with the results—Arduino

I have a small project that I could use help understanding how best to move forward. I have a set of 8 batteries of different voltages and age. I’d like to read the voltages of all, assign an ...
0
votes
3answers
82 views

Multiple Vibration sensors via single optocoupler

I am designing simple security system to protect 20-30 windows (total length about 50m) with vibration sensors (based on SW-420 modules). Window are on the roof and due to environment i use ...
0
votes
1answer
43 views

Arduino Voltage Divider Connection

Can anyone explain the connection of the voltage divider in this image, why it's connected to A0? I put a red circle on the section that i don't understand.
0
votes
2answers
125 views

Do I need a resistor on the base of a transistor?

When I am connecting an IO pin of a microcontroller to the base of a transistor, do I need a current-limiting resistor between the IO pin and the base? Or can I just directly connect the pin? My ...
0
votes
2answers
48 views

Selection of External Current Transformer

simulate this circuit – Schematic created using CircuitLab I am designing a product for motor protection circuit. where I want to use customized external CT for application which gives me ...
0
votes
1answer
135 views

Trying to increase amperage of Arduino Uno digital pin (20mA) to control a cabinet lock that is rated at 12v / 2A

I am trying to use my Arduino Uno to send power from one of its digital pins to a cabinet lock, the cabinet lock is "fail-secure," so you send power to it to unlock ...
0
votes
0answers
76 views

Buck-Boost Controller Arduino Nano vs STM32

I have 900W (150W*6Panels) solar panels and 12V inverter (1000VA) which have inbuilt PWM solar charge controller. The distance between pannels and inverter is around >10m and the wires are 6 sq mm ...
14
votes
4answers
1k views

Motor fader PID control

I'm trying to control a motorized fader (linear slide potentiometer) using an Arduino. PID control gives good results for "jumping" to a specific target position, but tracking ramps is a problem, it's ...
1
vote
0answers
67 views

Control magnet through stainless steel wall

I'm a mechanical engineer enthusiastic about learning electrical engineering and I speak french so I thank you in advance for your comprehension and your help. I would like to be able to activate an ...
0
votes
1answer
59 views

Using Multiple MLX90614 Sensors on Arduino Board

I've been trying to get something working for a project, getting 4 (just trying to get at least 2 working for the moment) MLX90614 IR sensors connected up to an Arduino UNO board. I've followed the ...
1
vote
1answer
120 views

USB Device that acts like a printer [closed]

Our client uses some third party software and devices for their internal work. They print 600 pages per shift and now they wanted to eliminate paper usage without changing their existing systems. ...
0
votes
0answers
44 views

Sending Array data from Arduino Mega 2560 to Nextion and explode the data for required components

I am trying to make a device that shows Temperature sensors data and their graphical illustration at the same time. I have 4 texts (that show temperatures) and 4 gauges (that works as temperature ...