Questions tagged [arduino]

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59 views

Arduino RFID Multiplexer Antennas

I want to make a electronic chessboard that detects the position of every piece on the chessboard. Every chess piece will have RFID tag. My idea will be to have 2 multiplexers(1*8) one for the rows ...
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28 views

Wire.endTransmission(); have trouble ending

I am trying to read data from an INA219. To save some memory, I looked at the .cpp file from Adafruit_INA219 library: (Adafruit basically used their function wireWriteRegister(0x05,cal);) ...
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118 views

Not debouncing on a MIDI keyboard

I am modifying an old 90s keyboard (CTK-450 by CASIO) to make it a MIDI controller. I'm going for an Arduino that goes over the matrix layout of the keyboard. The issue I have is with debouncing. ...
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92 views

How to drive an AD9850 at 100 kHz/s sweep using arduino or rasberry pi?

The basic problem I am interested in doing is using an ADXXX chip to make a linear frequency sweep through the HF bands, from 1-20 MHz. The sweep rate I would like to achieve is 100 kHz/s, which ...
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63 views

Optocoupler with Arduino

I'm trying to input 12v into Ardunio Digital inputs. But since Arduino digital input max voltage is 5v, I would like to use an optocoupler as a switch for 12v input into 5v from Arduino itself. So I ...
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63 views

How to wire 0.91/0.86 inch display to i2c?

I have a 0.91 inch display with a 4 pin I2C connection. I then realised that I needed to use a 0.86 inch display with the connector in the above image. I have searched on google on this but nothing ...
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2answers
66 views

Working principle of a MOSFET Transistor

I was just reading a blog entry regarding the power conflict of the Arduino and trying to understand everything, when I came to a point where I could not understand the working principle of the ...
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79 views

How to properly connect IR photodiode

I encountered some problems with the signal from photodiode and don't know how to connect it effectively. Datasheet can be found here: https://www.marktechopto.com/pdf/products/datasheet/MTPD1346D-...
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1answer
56 views

Is this a valid matrix circuit, I've drawn it based on guides and examples online

I'm trying to build a matrix of 6 toggle switches 6 momentary buttons 4 rotary encoders I'm going to use a Pro Micro board and I'm wondering if my wiring looks okay, this is my first real ...
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186 views

Failed to connect to ESP8266: Timed out waiting for packet header

I'm trying to program ESP8266 Node MCU v0.9 using Arduino IDE. I'm trying to upload the most common sketch i.e. blink which is available in the examples of ESP8266. Even then I'm getting this error - ...
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56 views

Chaining 25 74HC595 shift registers together

Situation: I am doing a project which requires me to chain 25 74HC595 shift registers together. They ate controlled by an Arduino microcontroller. Question: Will it work when chaining that number ...
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68 views

Finding value of resistor between two diodes [closed]

I'm using an Arduino and I have the following circuit: I couldn't find the symbol for analog signal, so the voltmeter represents a connection to the Arduino's analog input pin. How can I work out ...
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105 views

How to choose R and C to reduce noise on analog input of arduino?

I'm not terribly proficient when it comes to hardware, so please bear with me. I've tried to google around to figure out how to choose values for a low pass filter to reduce noise on a potentiometer. ...
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1answer
95 views

3D hologram fan display

Did not know where else to ask about this, so if it is off-topic I would gladly take some pointers as to where the correct place would be. I would like to make one of those spinning LED fans that can ...
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1answer
12 views

Functioning Problem In Accelerometer

Hello I have used ADXL335 Accelerometer in a gesture controlled project but I have powerd by 5v output from Arduino Lilypad, so it started creating mess by giving wrong outputs. Afterward I came to ...
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41 views

Adafruit eInk Display and ESP32 Huzzah

I have an ESP32 Huzzah board from Adafruit and am trying to control a 2.19" flexible eInk display to no avail. While the screen occasionally updates, the full black and white "clear" screens work but ...
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1answer
56 views

What is the exact formula relating a DC motor's input voltage and torque produced?

I'm trying to control a 12V geared DC motor with encoder through an Arduino by an L298D driver for my self balnace bot. Based on the angles from the attached gyro sensor and encoder, it calculates ...
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58 views

RS485 communication between Arduino

I want to transfer data (only numeric values) between Arduino Nano and Arduino Mega 2560. I tried with my own code and tried with several libraries also. Arduino Nano code ...
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1answer
82 views

Do I need a buck converter?

I am planning to build a circuit with a bluetooth audio receiver (MH-M18) and an Arduino Nano, connected to a DIN connector. I have a wire with 12V supply readily available to connect to the circuit....
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74 views

How to rule out that you have a faulty power supply?

Just for context: I'm trying to code an ESP8266-ESP01 through an arduino, but I'm failing and my primary suspect, as per other forum issues I read, is that the power supply is the fault. I've tried ...
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46 views

HowTo create an accurate constant-current dummy load using immersion heaters controlled by Arduino?

Given: variable sized nominal 3.2V LI/LFP battery cells, from little 18650 / 26650 cylindrical A123s up to large prismatics from CALB / Winston etc. the desire to capacity-test them off grid (no ...
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1answer
162 views

Amplifying particular range of analog signal

I am working on an a project where I need to get the reading of an analog transducer via Arduino's 10 bit ADC. The problem is, the range of the signal is such that the 10 bit ADC value is moving from ...
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1answer
71 views

Issues reading from an I2C device

I'm testing out the BQ25887 2 cell balance charging IC, and I'm trying to read the data from the I2C interface. But I'm not getting any results. I am unable to see any values from the serial monitor ...
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1answer
52 views

How to specify throttle range of RC ESC?

I've bought some cheap ESC's off banggood in order to build a drone. Now I'm trying controlling them using an Arduino. I just can't figure out how to use them properly. The ESC is called XXD HW30. ...
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44 views

Wireless serial programming without the need to press a button to program it

After a long play, I made this adapter to be able to program a Pro Mini wireless via BlueTooth. The long play wasn't the adapter but the settings of the BlueTooth module (baudrate is fixed and need to ...
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2answers
48 views

How to connect wires between power supply and switch?

I'm trying to connect non-fused and European AC power socket/toggle switch to power supply. Probably very "newbie" question but as a starter I didn't want to try-fail with this thing for safety ...
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1answer
57 views

WAVGAT Pro Mini, no serial output

I ordered some Pro Minis however get some WAVGAT clone thingies. The first problem was it is running too slow (4x slower) when compiling with default "Pro or Pro Mini" board profile. Serial however ...
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46 views

How to ground external AC voltage (18V) to Arduino?

I have a project where I need to read 0-18 Volts AC in Arduino's input (0-5V DC). So I did a circuit with a diode (half wave bridge), voltage divider, and a RC circuit where I tested some values for ...
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2answers
72 views

What circuit simulators can also simulate ESP8266 and/or ATmega328?

I'm going to start soon some ESP8266 and Arduino Nano projects. I've used some simulators in the past, but none of them simulated these ICs. Dou you know if there is any simulator, that would also ...
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1answer
55 views

Charging a 3.7v lipoly battery at less then 4.2v?

I'm trying to experiment with supplementing battery power using microbial fuel cells. MFCs are batteries that produce their charge from decaying matter, but they often only get up to 0.9v (unless ...
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2answers
104 views

L298N heating up when driving a Nema 17 with Arduino

I've just bought a Nema 17 (Motor NEMA 17 40mm 1,2A 2,6kg/cm 1,8º 42STH40 1204A CNC) to build a pet feeder, and to control it I'm using a L298N driver I've also bought. I've wired everything together ...
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2answers
110 views

How do I move a motor to a desired angle using a motor encoder?

So I have this project, the goal is basically to be able to make a motor move to rotate a set of gears and move a panel attached to a hinge to a desired angle. I have a motor encoder attached to the ...
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1answer
36 views

Delay between steps, given speed in mm/min [stepper motor]

I'm building a device that have to move in orders of thousandths of mm per minute. I've got suitable stepper motor and driver, it is working correctly but I'm unable to figure out the formula needed ...
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1answer
35 views

Battery connected to TP4056 will not operate load

I have a simple circuit with an Arduino board (load in the diagram) that I want to power using a solar cell via a TP4056 board. The 18560 Lipo battery is for powering the Arduino during night time. It ...
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1answer
28 views

GSM SIM900 isn't communicating with the Arduino

When I connect my GSM SIM900 module to the Arduino and insert a SIM card, the Netlight and Status light blink for few seconds and then it stops. I am using 5V 1A to power the GSM and pins D7 and D8 ...
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1answer
73 views

Arduino based digital to AC conversion schematic

I am trying to build an Arduino based system for sending electric pulses, of 24V, 40mA sinusoidal. Each pulse is in a burst of 5000 microsecond, and each pulse is about 20 - 800 microsecond. These ...
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1answer
37 views

Common anode RGB LED lights going out one color at a time

I have a project involving 4 reed switches and an RGB LED. They are all connected to an Arduino and the code basically says each time a magnet touches a reed switch it lights up with a specific color. ...
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2answers
103 views

Looking to generate 25 Hz square wave at about 90 V AC

I am looking to build a square signal generator tuned to ~25 Hz at a voltage of ~90 V AC that can output ~400 mA. I've searched around the internet and tried a few things but I've had no luck. My ...
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1answer
46 views

Good solution for TPS54202 input filter design?

I trying to make tps54202 switch regulator for esp32-wroom which would pass EMC test. https://www.ti.com/tool/TIDA-00948 By reading guidelines of designing they say that to pass EMC test you need to ...
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1answer
86 views

what is I2c address of BNO055?

I made a custom circuit with bno055 it shows i2c address 0x70 is it possible? I used the Arduino i2c scanner. I am not getting any data aswell nothing else is connected to Arduino nano board as well,...
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80 views

Choosing Three Phase SSR

I want to control the power of heating elements with arduino and for this reason I'm looking for help for choosing the correct Three Phase SSR. I'm currently looking at this SSR with Zero Cross Turn-...
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2answers
64 views

Is the TPS54202 buck converter a good solution to pass the FCC SDoC?

I want to design a PCB with the ESP32-WROOM module which has bluetooth. I want to pass the FCC verification. I would use a linear regulator, but it makes too much heat. My input is 14V car battery, ...
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1answer
55 views

Attiny85 for wireless communication

I'm a very beginner in electronics. I'm trying to make a system which transmits a tank chemical level to a distant system. Remote system is an Arduino. For the tank unit I have 4 float switches. ...
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40 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
47 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
33 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
112 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
56 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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1answer
43 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 ...
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2answers
72 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 ...