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Questions tagged [arduino]

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21 views

Calibrating FEETECH FR5311M Digital Servo

Hey everyone, I am owning this model feetch servo motor. I want to do the following:(with arduino uno) Read the initial position(angle) of the servo motor rotate the motor to desired position(angle) ...
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1answer
41 views

Controlling Multiple I/O Devices

How to manage multiple Input(Sensors like Temperature, Humidity, etc..) and output(like motors, relays, etc..) devices connected to a micro controller(Arduino UNO). There are more I/O devices present ...
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1answer
19 views

Design a debug interface for Arduino MKR WIFI 1010

I'm a TA at university, and for the next years students in microcontroller, I will design a debug interface for the Arduino MKR WIFI 1010. The 6 pads on the back is the debug interface as shown in ...
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0answers
92 views

Stepper motor vibrates, without turning

I'm trying to get a stepper motor to work, but having issues. I've done a lot of debugging, but still can't figure out what's wrong. When I try to turn it around, it just makes a buzzing sound, and ...
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0answers
25 views

Device to transmit raw accelerometer data over wifi? [closed]

This is a pretty general question, as I don't know too much about electrical engineering so if more information is required please ask me and I can retrieve it. I have been given a system that uses a ...
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0answers
32 views

ESP32 MOSFET Control with a Twist

Looking for some help with using an ESP32 (running Arduino IDE) to control a MOSFET. Currently, I have used the combo to control many things successfully by electronically "pressing buttons" by ...
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0answers
59 views

0.96 oled not working with less than 4.2 volts [closed]

I have powerd up 0.96 oled display with 4.2v lithuim ion battery and it works fine but when voltage reaches to 4.05 display shuts down why is this happening,display supposed to work with 3.3v to 5v. ...
0
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1answer
28 views

How to wire digital voltmeter/ammeter to measure arduino battery consumption

I'm not sure if you can tell but I'm a bit of a beginner, I want to wire up an digital voltmeter/ammeter combo to measure arduino power consumption. I found the following device which seems suitable ...
0
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1answer
41 views

Best switching voltage regulator solution/circuit for esp32 module, that RF wouldnt suffer and would pass FCC verification?

I want make esp32 bluetooth project which would be powered from car OBD2 port. Input voltage ~14V, output voltage needed 3.3V, max current ~0.3A. Efficient way would be use switching voltage regulator ...
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2answers
56 views

Transistor as a heater device and measured by LM35 temperature sensor?

The aim is to make a temperature control circuit using an Arduino Uno as a controller, an LM35 sensor as feedback to measure the actual temperature, a TIP31C transistor as actuator to control the ...
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0answers
25 views

Slower Voltage Reading Times After Upgrading PC [closed]

I'm using an arduino to measure and send various voltage values serially via USB to my PC, where the data is then collected and stored via Python. Each voltage is sent as 1 byte (so 8 bits of accuracy)...
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2answers
65 views

What are these female 2.54mm (0.1") crimp terminals?

So I but some crimping terminals to make my own custom cable connections for the first time today for an Arduino project I'm currently working on. Comparing to some older ones I have from premade ...
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5answers
99 views

Electromagnetic 7-segment flip display: H-Bridge alternatives?

I have an electromagnetic 7-segment flip display which has 28 electromagnets for 4 digits. They run on 20V, have a 7.5W power rating and need alternate polarity applied to switch between the 'on' and ...
0
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1answer
78 views

How to increase Amperage while keeping the Voltage the same

I currently have an Arduino Uno board which has an output of around 5V @ 900mA. is it possible to bump up the Amperage to around 3-4A while keeping the Voltage the same? Maybe with a Transistor, but i ...
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0answers
33 views

Controller Motor With Multiple Transistors with Arduino

I am trying to control a motor with two MOSEFT transistors (one is enabled and the other is disabled). The problem is Ardunio requires the grounds to be connected which causes the voltage where M1 ...
1
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1answer
18 views

How to connect a Sparkfun LiPoly Charger to an Arduino Nano?

I was able to upload the Adafruit SSD 1306 OLED Library to an OLED Display using an Arduino Nano. Now I want to power the Arduino Nano via a Lipo Battery but the battery must be rechargeable and I ...
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0answers
28 views

Control motor direction with BTS7960

I am using the same BTS but I am controlling it with labview. I am able to control the speed in one direction, even though I have both R PWM and L PWM connected to PWM pins 3 and 7 respectively on my ...
0
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0answers
47 views

Why does my circuit short when powering through the same board as compared to an external power?

I have designed a board which follows this schematic: What I’m trying to achieve is using a N-Channel MOSFET to make the SDOOR inputs connected. The SDOOR inputs are from another controller (STM20) ...
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0answers
30 views

Good switching regulator for esp32? [closed]

Hi Im planning to design pcb with esp32 chip. Problem Ive run into is power supply. Ill be using esp32 in my car which battery tipically is 13v-14. Linear regulators is to hot to drop that voltage. In ...
0
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1answer
32 views

Potentiometer volume control for a piezo buzzer in bridge (2-pin) configuration

I have a 10K potentiometer that I'd like to use to control the volume of a piezo transducer/buzzer, which is driven by one or more MCU PWM-capable pins (ranging from 0 to 3.3V). Originally, my ...
0
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0answers
37 views

NODEMCU _ MCP23017 IO Port Expander Schematic Design

I am designing a relay driver using NodeMCU and need additional IO Ports, therefore I have designed a schematic utilizing MCP23017. I think the schematic looks good, however before I order PCB's ...
1
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3answers
107 views

Connect a Switchboard to Arduino

Sorry if this is a simple question, but I‘m quite new to Arduino. What I‘m looking for is a way to connect 100+ strain gauges to one Arduino board. Now, those each need a separate ADC (HX711) to ...
0
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1answer
55 views

What Is The Correct Way To Recombine A Split Serial Signal?

I am trying to replace the lamp and ballast assembly in an Acer P1500 DLP projector. The ballast is an OSRAM PT-VIP-05 COMPACT. It features a UART control scheme that allows the motherboard to query ...
0
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2answers
53 views

Wrong ground reference producing wrong output on ADS1115

I am currently working on a project, which involves measuring current in a DC circuit and storing that generated data on an arduino microcontroller. I decided to go with the ADS1115 and a shunt, which ...
0
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2answers
50 views

Arduino for detecting low voltage on UPS

Scraping together some parts, I managed to build a 22AH 12V battery pack, but I don't want to damage the batteries. I am using 4x 12V 5.5AH UPS batteries wired in parallel. I have an Arduino Uno, ...
1
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1answer
33 views

UART noise on audio lines

I have a fairly simple circuit with an Arduino and a SA818 RF module, I'm providing 3v3 power to the SA818 via two series diodes (dirty I know) and am communicating using software serial, of which the ...
0
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1answer
39 views

High Power LED Circuit Design & Constant Current Source Question/Feedback

I'm trying to design a dimmable LED circuit board. It's controlled by Arduino with its PWM signals. I'm new to electronics so I have some question regarding my design and knowledge on it. I've ...
0
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1answer
35 views

How do I read a simple touch sensor value from Arduino? [closed]

I suppose instead of connecting to the LED it will connect to A3 on the Arduino for example but I'm having a hard time making it work. I don't know which point on the circuit should be connected to ...
0
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1answer
41 views

A simple Arduino Uno HC-05 system doesn't work

I have an Arduino Uno, HC-05 module and an LED. I want to connect the HC-05 to my phone and with an app be able to turn on and off the LED and at the same time sending a message from the Arduino to ...
0
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0answers
26 views

What is the recommended way to connect TP4056 charger module to NodeMCU v2

I want to power a NodeMCU v2 with a 3.7v 2000 mAh LiPo battery and charge the battery with the NodeMCU connected (i.e. under load). After looking into various forums, I ordered a TP4056 battery ...
1
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0answers
18 views

ESP8266-12E & BPM180 - Bad pressure retrieved

I have NodeMCU (esp8266-12E module) and connected BMP-180. I try to read pressure from BMP-180 in async web request, but it reads bad value. For testing purposes I log pressure in loop() - and it's ...
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0answers
41 views

Using one electrical pump for multiple hoses [migrated]

I'm currently trying to figure out a cheap way to build a cocktail machine. For now the machine should have about 20-30 possible input liquids. These liquids should remain in their original bottle ...
0
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1answer
94 views

Door lock solenoid with finger print & Arduino Nano

Update - 22.01.2020 Here is my schematic. I tried to use all of the comments guys below: Should I use a fly-back diode as commented after I cleared the schematic? If yes, where? Is it required to ...
0
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1answer
41 views

Circuit design and power management in an Arduino project with stepper motors and solonoids

I am working on a design for a Arduino driven project that controls a 1.7A stepper motor and 2 small solenoid valves. I am using a 12v power supply (Meanwell MDR-60-12) to power the stepper motor (...
0
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0answers
85 views

How should I connect 5 buttons to arduino so that I can use the least number of inputs all the buttons are connected to ground [migrated]

The problem here is that I want to connect 5 input buttons to an Arduino but I do not want to utilize 5 input pins of Arduino, is there any matrix like connection using which I can reduce the number ...
0
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1answer
70 views

Arduino current measurement

Hello I am planning to use an Arduino to make a joulemeter for a current range of 0-30 amps and voltage range of 0-24V. The voltage measurement is fine but I have questions about current measurement. ...
-1
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1answer
124 views

2n2222 can not make it work as gate

simulate this circuit – Schematic created using CircuitLab I am trying to make a simple switch with the 2N2222, so i can send 5 volts from a 3.3 V output pin on an arduino/raspberry pi. I have ...
0
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0answers
37 views

NodeMCU-12E - Conflict between I2C and SPI

I have SPI SD-card module connected to nodeMCU, and it's worked well. Next I try to connect I2C sensor, and it doesn't work. Looks like SPI conflicts with I2C, because when I disconnect SD-card, I2C ...
2
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2answers
407 views

Purpose of a Pull-Down resistor [duplicate]

Being just a beginner I'm really getting confused of pull-down resistors. Please have a look at the diagram below. Here there is a 10k pull down resistor is connected to ground and the pin 2 of ...
0
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1answer
41 views

ESC signal standard and PWM frequency

I got the following code from the video. However, I encountered an issue that, the motor tended to stop working at maximum value. ...
1
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4answers
111 views

74HC595 8x16led matrix arduino

I'm currently trying to learn how multi shifting is working and have therefore started a project where I wanna drive 2X 8x8 LED matrix with an Arduino. I have found it that I should work with the ...
3
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0answers
78 views

Replacing an ammeter with voltmeter?

I have found this circuit of a millivoltmeter, and it seems like something which as a hobbyist I can do it, and the range of the measurement is very suiting one of my projects, but I would like to ...
8
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5answers
272 views

Infinite loop on microcontroller vs modern CPU

On a microcontroller (more specifically, on an Arduino Uno board using the ATmega 328P microcontroller) I would normally use an infinite loop to check for inputs etc (in Arduino land, this is normally ...
8
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4answers
3k views

How can I make my PNP amplifier circuit to turn off faster?

I'm using the following circuit to switch a 24V signal to a PLC. The rising edge is fast and perfect(38 ns) but the falling edge of the signal is not as good(3.5us)! How can I modify this circuit to ...
-1
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0answers
41 views

What is the acceptable voltage range for 3.3v sensors and other devices?

I have a few sensors I am working with that accept 3.3 voltage only. I am also working with a few Arduino Nano-type boards, which are not of perfect quality and give out 3.5-3.6v at the 3.3v pin. Now, ...
1
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1answer
93 views

AC Nanovoltmeter for Arduino alike?

I have searched across web, but I am unable to find such a circuit. I am looking for a circuit of a AC nano-voltmeter in range 5-10 to 100 nV which output is suitable to be handled by some precise ...
0
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1answer
54 views

Proper usage of PC817 Optocoupler

I'm creating a logic based circuit and below is my schematic. The circuit first steps down a 24 VDC input to about 3.7 VDC using a 150K ohm resistance and a 5.1V Zener diode. This 3.7 VDC is fed to ...
1
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5answers
105 views

Small 5V BLDC motor controller - 6 mosfet IC

I am creating follow focus system (motor with gears that moves camera lens ring). I think the best choice is BLDC motor (DC geared are too loud, stepper don't have enough torque or too big). I need ...
0
votes
0answers
57 views

0-5V Audio Signal with TL082

I am working on an Arduino project that requires me to be able to handle audio input from a 1/4" input jack, and it needs to be powered with just one 9V DC input. Since the Arduino cannot process ...
0
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0answers
17 views

Arduino FFT noobie question [migrated]

How do you obtain the real and imaginary parts of a signal using FFT in arduino? I could not find a particular tutorial with code for this purpose in the internet.