Questions tagged [arduino]

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69 views

4-20mA output from Arduino Nano

To convert 1-5V to 0-20mA: When I use 3.3V ouput from Arduino Nano Power Pin--> Iout = 13mA (which is ok). Similarly, with 3.3V Battery -> Iout = 13mA (which is ok). But, when I use 3.3V ouput ...
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46 views

Using a slider potentiometer with an Arduino

I'm new to electronics and in the process of building a Joystick using an Arduino Leonardo. I am reusing parts from an old Joystick from the 90s https://www.amazon.com/F-15E-HAWK-Tactical-Control-...
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2answers
475 views

UPS battery as auxiliary power supply for car - charging and detecting car on

I'm designing a arduino-based car system that I would like to have running even when the car is off and parked. Though the system is designed to be very energy efficient, I don't want it to run down ...
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1answer
30 views

How to pass a changing value to a graphic display using Arduino?

I am using an EA DOGM132-5 graphic display, they also have provided a library for Arduino, so everything is nice and easy. The library has a function for easily passing a string to the LCD. ...
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Is it good to wire WS2813 LED strip DI and BI together?

I have so far only worked with WS2812 strips and understood, that the WS2813 have a backup data line. But how do I connect the first LED to my Arduino (acts as a controller)? Many tutorials said I ...
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2answers
49 views

Recording bioelectrical activity in plants- will this circuit work- any advice on sensors?

I am a visual art student and I'm currently developing a project which involves recording bioelectrical activity in plants. I am totally new to this game so I’m just wondering if anyone can have a ...
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25 views

Feedback on Schematic and Board Design (Following Prior Feedback, Includes BOM)

Table of Content: Purpose of the Project Schematic "Guide" Schematic Board Questions Purpose of the Project: Firstly, thank you so very much for reading this. The general goal of this project is ...
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1answer
1k views

MCP23017 with NODEMCU v3 (lolin) i2c doesn't work

I want to use NodeMCU v3 with MCP23017 that has MAX6675 at the end. Everything is on circuit please see the image. MAX6675 (U3) doesn't want to work with MCP23017. First MAX6675 (U4) works perfectly ...
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1answer
75 views

ATX PSU turns itself off when uploading sketch to Arduino

I'm trying to power a stepper motor with the 5V rail of an ATX PSU and control it using arduino. To keep the PSU running, I have shorted the PS_ON pin to ground. ...
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24 views

What board should I use to control my 3D printer

I'm trying to build a simple experimental FDM 3D printer as a hobby. As I said it's a simple printer with only basic functionalities such as receiving the slicer file to print from a slicer software ...
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1answer
438 views

How to increase (optical) power of arduino circuit with LED? Increasing current with fixed voltage

We have an LED that when connected to an Arduino board provides an optical power of 22.58 mW. The circuit is just the LED in the digital Pin with the Arduino powered by the computer using a USB cable. ...
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43 views

What options exist for a for low-latency (<1ms) photosensor?

I'm wanting to build a computer keyboard-to-display lag measuring tool using an Ardunio: User places the photosensor right-up to their computer monitor. User presses a button on the Ardunio. The ...
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20 views

Mega2560 no response from serial after replacing 5v voltage regulator

The voltage regulator failed on my Mega2560 (using 12v supply, was seeing 12v on input and 3v on output). I replaced the component and the code runs fine but I can no longer communicate by serial over ...
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1answer
395 views

Controlling a 24VAC solenoid with arduino

I'm trying to come up with a design for controlling a 24VAC water valve with an arduino. My current design : I want to use a BT1308W TRIAC controlled by an arduino pin to activate the vale, I'm also ...
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24 views

How to install Arduino Driver, if it is not discovered by pc(Win10)?

I bought an Arduino Uno on amazon, and when I connect it to my pc it is not discovered by the pc. Even if I use hdwwiz and install the driver, it says that the ...
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1answer
85 views

How to control motors with an arduino

I am a complete beginner with electronics mostly dabbling as a hobby so please forgive me if I struggle to follow or don't understand specific terms. I have been working on a project for a while now ...
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20 views

5 wire, Logic Output Photointerupter/Slotted Optical Switch

I am trying to get a digital output from a 5 wire photointerupter. The p/n is OPB903w55z, it is configured as an inverted open collector. I have used 4 terminal transistor output photointerupters ...
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1answer
448 views

Sound Chip Audio Amplification Circuit YM2612 + TDA1308

I've been working on a project for connecting a Yamaha YM2612 to an arduino and triggering sounds to be played from the chip. I'm having trouble on the audio part of the circuit. I've worked out a ...
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0answers
21 views

LED driver - current monitoring AC or DC side with Arduino

I have 2 LED strips connected in parallel to the same LED driver (driver is constant current + constant voltage). I have got an Arduino controlling a relay module that switches the lights on or off (...
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1answer
50 views

Steering wheel controls with zener diode?

I am looking at my steering wheel schematics and trying to find what are these zener diode doing there? I want to be sure there's no problem feeding 5V from an Arduino to check the ADC values without ...
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3answers
63 views

How to automatically disconnect from battery when USB +5v is present

I'm creating a SMD PCB where space is extremely limited. Usually, the application is powered by a battery (Single cell 3.7v lipo). To charge the battery, I'm using a USB cable. What I'd like is for ...
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0answers
22 views

How to design a multiplexed keyboard circuit for Arduino?

Hi all, I'm working on a project where I'm trying to read my calculators keyboard to know which key was pressed. I've decided over the past few days that hooking into the calculators PCB wasn't ...
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0answers
42 views

Ask about Opto 6N137

I want ask something about opto 6N137. i have two 6N137 1 is Vout = +0,2V 2 is Vout = +1,3V which is working ?? Did I kill it? Or I did sth wrong? I have attached schematic for the same
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9answers
11k views

arduino power problem when using boost converter

I am making a bot capable of solving a maze. I will explain the setup first. There is a 18650 3.7V battery, using a XL6009 DC-DC boost switching regulator, like this one: Picture Source I boost the ...
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1answer
31 views

Cannot connect Arduino Uno REV3 ATmega16u2 serial connection to outside serial connection

I wanted to simply use the ATmega16u2 on my official Arduino Uno with a serial connection. I connected my Serial Board (where I can simply connect any serial connection and read it on my PC via Putty)...
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0answers
25 views

How would I control a non-individually addressable RGB led strip with an Arduino, an android phone and bluetooth

I want to control my non-individually addressable RGB lights with an Arduino, Android phone, and Bluetooth. My goal is to be able to create cool effects like lights that are reactive to the music. I ...
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2answers
259 views

Correct size resistor to light a 17v LED with a capacitor?

I'm very much a beginner at creating my own circuits and using an Arduino so please excuse any stupid mistakes and oversights. First of all here are the components I want to use in the circuit: ...
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0answers
52 views

Attaching sensors to PCB to minimize space

In my electronic product design project I need to come up with a completely finished product that can be presented in the market.What i'm designing is a turbidity meter with Arduino components with ...
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1answer
61 views

How to decide which key was pressed on a calculator?

Hi all, I'm trying have an arduino read key presses on my calculator. The calculator does it by pressing the keyboard membrane to the PCB and connecting two points, so each key has two of these ...
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0answers
14 views

Which pins of ATSAMD51 are used for I2C in Adafruit Grand Central?

I am trying to recycle my old Adafruit Grand Central board to use with Atmel Studio.I Adafruit website , I2C pins ( SDA , SCL ) are marked as PB20 and PB21 to be used as SERCOM-3 but in ADSAMD51 ...
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1answer
89 views

Using directly Arduino pins, can the Arduino deliver the current needed to trigger 4 or 5 optoisolators (moc3023) at the same time?

I'm using an ATmega328P to contol 4 optoisolators via 2n3904 transistors. It works perfectly. I want to eliminate the transistors if the Arduino can deliver the needed current to control them. **...
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1answer
393 views

Honeywell Pressure Sensor TSCDANN150PGUCV, Amplifier circuit?

I have been trying to find amplifier circuits for this sensor. The datasheet has one on page 29 (pic attached). However as seen in the pic, the values for the resistors are not specified and we can't ...
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2answers
267 views

Controlling a stepper motor with a motordriver and Arduino

I'm trying to controll a Nema 34 stepper with a motrordriver(EM-314) and Arduino Uno. I have gotten the motor to rotate(slowly) by setting pin 5 on the Arduino to high. Pin 5 is connected to Preset 4 ...
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1answer
54 views

Do I need a diode to protect my ESP32 from a connected relay?

My ESP32 is controlling a relay which I switch on for 500ms (controlled through the internet). Do I need a diode to protect my ESP32 from voltage spikes when the magnetic flux collapses? I'm using ...
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3answers
69 views

Arduino frequency measurement to 2 or 3 decimal places

I am in the process of building a Proton Precession Magnetometer to calculate the earths magnetic field strength by measuring the precession frequency of protons in distilled water. I am using an ...
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2answers
161 views

LCD 16x2 Showing no text

I an trying to connect a 16x2 LCD text module with Arduino and it continuously shows only the green backlight. My code is correct and my connections are also correct. I tried the same project on ...
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1answer
22 views

Options for passive long range sensors

What I'd want to do is to use cheap disposable temperature sensors and to read the temperature data wirelessly. The sensors would be set in a medium such as reinforced concrete. Right now I'm using ...
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2answers
312 views

Running 20 WS2812 LED strips (80 pixels each) from a single Arduino and 24V Power Supply with Buck Converters

I am building a matrix with 20 WS2812 LED Strips. Each strip is 80 pixels for a total of 1600 pixels. I want to drive them all from a single Arduino Mega board. To handle the power needs, I have a 24V ...
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1answer
175 views

Arduino mega 2560 Analog max reference voltage

Each time I power up the Arduino, the max reference voltage which is represented by 1023 changes. I observed this by measuring the voltage from the Aref pin each time. Is there any internal function ...
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0answers
25 views

FIFO operation achieving arduino mega [closed]

I need some algorithm to implement logic. i have 8 different digital input and 8 digital output.assume i have given input in this format ** f1- first input f2- sec input f3 - third input f4 - ...
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1answer
161 views

Trying to read the data from an ASK RF transmitter

I'm trying to duplicate the operation of a simple RF remote control (for some remote power outlets). In the remote control there is an unmarked 8-pin microcontroller. I've worked out which pins are ...
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1answer
333 views

Simplest way to switch inductive load with arduino?

I'm trying to switch (just on/off) a 3.7V motor (coil resistance 2.2 Ohm) and a 6V motor (coil resistance 8 Ohm) with an arduino mini. And I have trouble finding an universal way to do so. What I ...
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1answer
33 views

How to detect a magnetic field from a distance?

I want to detect a magnetic field, like those of small neodymium magnets, from at least 6 inches away (the further the better, I'd like at least a foot but I won't ask for too much). I'd like to do ...
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1answer
22 views

4-20ma 3 wire linear transducer and arduino connection problem [closed]

I am trying to connect a 24 volt 4-20ma 3 wire resistive linear transducer to arduino with 4-20ma to 0-5 volt converter (https://www.amazon.com/Isolation-Current-Transmitter-Converter-Transformer/dp/...
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0answers
35 views

Solar Li-Ion Charging with load-sharing

I need some help regarding my project. I have made a dog feeder with Arduino Uno, which is powered with a 3000mAh Li-Ion battery. I want the system to be charged with a solar panel (more solar panels ...
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1answer
16 views

Arduino RGB ledstrip control 2 separate power supplies

Please ignore the 2 green and orange lines in the middle and consider the transistors to be IRF mosfets instead. First of all looking at the setup on the picture: is there any issues with using 2 ...
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0answers
31 views

Interfacing DE10 FPGA and arduino

Is there a way to connect DE10 lite FPGA board and Arduino UNO without an arduino shield? I want to test my UART module that I created on my FPGA board and was thinking of making it talk to my Arduino ...
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3answers
77 views

Daisy chaining ground to buttons

I am building a small controller box based on an Arduino or similar MCU board. There are upto 6 buttons on the controller. In regards to ground, can I daisy chain the ground round all switches? ...
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2answers
1k views

Pulse width of a stepper driver

I have a stepper motor that has 1.3Nm holding torque. Im using TB6560 driver at 3A phase current and half step mode. And also Im using Arduino for generate step signal for the driver. If I generate a ...
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2answers
121 views

Drive 10 piezo buzzer from micro controler simultaneously and independently

I'm looking for a solution to drive simultaneously 10 piezo buzzer from teensy. I'm aware about the limitations of the number of internal timers so I'm looking for an external chip that would enable ...

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