Questions tagged [arduino]
Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
8,480
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Interfacing an NRG 40C anemometer to an Arduino
This diagram illustrates interfacing an NRG 40C anemometer to an Arduino:
"NRG 40C Anemometer Arduino circuit"
I hope that someone has an alternative circuit or interface design to help me ...
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3
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Is it possible to change Arduino Nano sine wave frequency without using PWM? [closed]
I have a program that generates a sine wave (array with predefined 8 bit values) on an Arduino Nano.
...
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Confused regarding PCA9685 registers
I'm trying to implement a minimal PCA9685 driver in C using Linux's built-in I2C API, and am reading the datasheet and the Arduino library's implementation of setting the PWM values.
I have come ...
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How to use TVS diode for Overvoltage Protection while powering Arduino on Vin Pin?
I am trying to make a protection circuit for Arduino nano to protecting overvoltage. Normally if I powering "Clone" arduino NANO with 12 Volt, Arduino nano is starting to smoke. So I've ...
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How to implement the clock-signal requirements for the MAX291EPA+ with an Arduino Nano Every?
The following text is an excerpt from the datasheet for the MAX291EPA+ an 8th-Order, Lowpass, Switched-Capacitor Filter.
The MAX291/MAX292/MAX295/MAX296 maximum recommended clock frequency is
2.5MHz, ...
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Current output capacities of Arduino Nano and STM32 Blue Pill
I am planning to try out STM32 blue pill and black pill to replace my Arduino Nano. I learnt here that Nano has a maximum current output of 800mA, I would like to know what is the maximum current ...
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268
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MPU 6050 reading goes erratic when it has small vibrations
Arduino code below shows how to get the angle values from MPU6050 gyroscope sensor. This works extremely well when there is no vibration. However, if there is vibration coming from dc motors, the ...
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Is it better to have one computer do everything or have a computer and a microcontroller for servos? [closed]
I am debating whether it is a good idea to offload the 12 servos I plan on having in my project onto an Arduino rather than on the Raspberry Pi. I am planning on using the Adafruit 16-Channel 12-bit ...
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92
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NPN transistors, LED strip and Arduino
I'm trying to control an LED-strip with an Arduino like an 8x8 matrix with a common anode (pic 1).
I put 2 NPN-transistors in the circuit and a LED-strip between them. The first transistors in pic 2 ...
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PID to balance a single-propeller pendulum
Dear all, I have my setup in the image which uses micro DC brushless motor instead of the 3-phase motor shown in this video, may I know what modifications should I make to the author's PID arduino ...
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MotionKing 17H2A Stepper Motor with BigEasy Driver not working. Making noise, but not turning!
I'm trying to make the MotionKing 17H2A stepper motor to work with my BigEasy driver and Arduino Feather 32u4 LoRa.
It's just making some noise, and not turning around.
This is the diagram for the ...
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Reading ACS71020 over I2C gives choppy and inaccurate data
I am programming ATtiny414 which read current, power and detect zero-crossing. For Test, I connect 220V 72W light bulb but I can't read accurate value. Also I observe zero-crossing pin and it is ...
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Audio processing from Arduino
The project is to design a device with multiple audio inputs and multiple audio outputs. The device should be capable to map input and output audio channels. Output almost same as the input. At what ...
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Why don't Arduinos have a fuse on the Vin pin?
I am designing a PCB for an Arduino Nano. I want to protect the Nano from over current and high voltage. In the schematic of the Nano, there is only one fuse at USB Vcc at Arduino Nano Rev3. No clone ...
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How to circuit IRL540N logic level MOSFET
I just want to test switching my 12V 3A pump and 12V 1A solenoid valve via IRL540, and was not sure about the circuit. Below is the circuit I am planning modification to.
I read here on the forum ...
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SparkFun BMP581 sensor is not working with an Adafruit with a TCA9548a multiplexer - Arduino
I am trying to get a SparkFun BMP581 sensor to work with an Adafruit TCA9548a multiplexer. The BMP581 works when it is not connected to the TCA. The inverse happens when the they are connected.
Code w/...
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Connecting MCP4725 Digital-Analog-Converter to "VDD" on Arduino
I have a humidity sensor that outputs humidity to my Arduino Uno. In order to send this value to my DAQ system, I am using an Adafruit MCP4725 Digital-analog converter(DAC), which turns the humidity ...
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2
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Do logic-level MOSFETs achieve galvanic isolation?
I tried using transistors (TIP122) before in my Arduino circuits to run motors and solenoids, but the analog input from a sensor would shift by many ADC values.
To sort that out I chose to use relay ...
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1
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152
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What is the voltage output from STM32 BluePill Digital I/O pins?
I am planning to use logic level MOSFET IRL540 as a replacement for my 5V 1 channel relay module to protect my Arduino pro micro from current requirements of the relay module. I would also like to use ...
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How I can read a 5 V input state correctly with an Arduino?
I want to read the output of a PLC with an Arduino. If the PLC sends a HIGH (5 V) on a OUTPIN, the Arduino should read this HIGH, else LOW. I am generally using this code for this:
...
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Reading 100s photodetectors
I'm trying to measure light intensity at a lot of points in a project. I have about 250 photo detectors (BPX 65). When I had just 1, I tried connecting it to an Arduino board. But I'm not sure, what ...
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How to add power switch to Adafruit Feather32?
I have an Adafruit HUZZAH32 ESP32 board, a battery and an on/off switch. I'd like to connect them in such a way that all of the following are satisfied:
Switch turns the board on/off
Board is powered ...
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2
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MOSFET gets too hot when controlling a Peltier
I want to control a Peltier element with an Arduino.
The idea is that I take the PWM of Arduino, turn this into analog with a low-pass filter (not in schematic) lower this voltage with a voltage ...
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ADXL335 accelerometer just reads high when using breadboard [closed]
I am using an ADXL335 accelerometer connected to an Arduino Nano 5V. For some reason, the accelerometer only reads the highest possible value.
As some context, I am only working with the sensor and ...
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Trying to measure individual voltages of two battery cells connected in series using voltage sensors and Arduino
I am trying to use two voltage sensors connected to an Arduino Uno to measure the individual voltages of two battery cells connected in series.
When I connect a sensor with only one cell, it gives the ...
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Selecting MOSFET for specific load [closed]
I want to control a load through a processor standard IO (3.3 V/12 mA) using a MOSFET. The load is 200 W.
If I understand it correctly, I don't need a optocoupler. It seems I need high Ids (at least ...
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1
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ATmega 2560 is getting hot controlling MOSFETs
I'm controlling 8 N-channel MOSFETS with the following circuit diagram. I have 8 of them connected to IO pins 20 - 27 and all works fine apart from overheating the microcontroller.
When I set the ...
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SPI with 2 ADCs (ADS1299) whilst synchronized
I am using 2 ADCs in the following manner:
I am using the SPI comm pins, with only CS differing for each chip. The ADC also has an internal oscillator, and on my device 1, I have clk_sel pin tied to ...
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How to control a DC-DC buck converter by an MCU (ESP32) to choose between two fixed voltage outputs?
I made this post a day before about controlling a DC-DC buck converter’s output voltage with an ESP32 DAC output.
Is it possible to control a Dc Dc buck converter output voltage by the DAC of an Esp32?...
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Is it possible to control a DC/DC buck converter's output voltage with the DAC of an ESP32?
I came across this question here:
MCU 'remote control' of DC-DC converter's Vout adjustment potentiometer
It is about controlling the output voltage of a DC/DC buck converter by injecting voltage into ...
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Conventional current and electron flow in Arduino
On an Arduino there are some pins named GND, some are 5 V, and so on. If electrons flow from the negative to the positive terminal, then does this mean that they are flowing from GND to one of the ...
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Alternative to soldering for an Arduino board [closed]
I’ve got an Arduino board and I can’t seem to find an alternative to soldering to keep wires connected to the board’s inputs/outputs.
I don’t really want to solder it, since this is my first board and ...
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How to let microcontroller power itself?
I'm trying to create a circuit where a button press results in a microcontroller booting up and sending a wifi request. I'm relatively new to electronics, so likely have a big knowledge gap.
Similar ...
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DHT21 / AM2301 sensor not measuring humidity Arduino
Although there was a similar thread it was for Raspberry PI. This sensor should work out of the box with the Arduino and should be more advanced than the cheap DHT11/22.
I have this exact sensor: ...
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Using 5V output from an Adafruit SHT40 humidity sensor with DAQ system
Using the setup guide for the SHT40, the only way I can get humidity and temperature from the SHT40 sensor is to hook it up to an Arduino and interpret the data coming from the SDL and SCA pins with ...
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Bluetooth speaker ground wire connected to 4N25
I am wondering if I can use a 4N25 optocoupler to turn on/off two small speakers. The reason for doing this is that when I turn on the unit, I won't have to hear "device connected". Side ...
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2
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TA12-100 current transformer - Safe to use over 5 A?
I have some cheap TA12-100 current transformer boards with a built in 200 Ω burden resistor rated to measure up to 5 A.
I would like to set these up with an Arduino to monitor a 120 V AC outlet that ...
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2
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Measuring high voltage DC using an Arduino
I want to measure a high voltage DC (electric vehiclr battery pack) source with isolation. The 4 ways I identified were using
Linear optocoupler
Isolated amplifier
ADC on the HV side and sending the ...
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4
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How can I power an Arduino with high voltage (400 V)?
I need to power Arduino that is used in pre-charge circuitry for an electric vehicle. The Arduino will monitor the battery and controller voltage. The peak battery voltage is 400 V.
I want to ask ...
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ATtiny85 IR decoding/receiving issue
Apologies if this specific issue has been addressed before, but I've scoured for hours, haven't found an exact solution.
Goal: To decode IR values using an ATtiny85 and display them over a serial port....
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Tinkercad - Circuit Simulation Failing
Building a simple circuit using Tinkercad, however, this keeps causing the simulation to not load. Arduino is essentially being used as a battery, with no code beyond what is default. If I replace the ...
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How to draw power from one of two sources according to priority, with indication for used source?
If two 5V power sources exist, one being always on and the other not (such as an ATX powersupply's standby 5V and "on" 5V rails), how could I draw power only from the "on" rail ...
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Serial communication in STM32 based boards
I've made a desktop application which interfaces with an Arduino board via serial ports. Now as I have completed my project in theory, I want to make a more professional PCB with a higher clock speed, ...
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Push-pull mosfet gate driver (using BJT transistors)
I'm trying to build a MOSFET driver, I am new in electronics, and specially in controlling MOSFETs.
Please take a look at my schematic, are there any mistakes or recommendations?
I'm trying to create ...
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4
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How does this switch debounce circuit work?
I recently started learning about micro-electronics, specifically the Arduino. I'm slowly going through the Arduino cookbook and have hit something I don't really understand. The circuit is a simple ...
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Help with the Texas Instruments TXS0101 for level shifting
I am considering the TXS0101 for my project, which essentially is multiple I2C sensors paired with an ESP32.
As the I2C for an ESP32 is 3.3V logic and some of my sensors are 5V, a TXS0101 seems to ...
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My non-inverting opamp circuit clips
I want to amplify the DAC output of an Arduino MKR WiFi 1010 from a 0-3.3V range to 0-5V. After some research I decided to use a non-inverting amplifier, with an LM324, using a rail voltage the 5V of ...
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TCA9548a + TCS34725 + Arduino MEGA not identifying the sensors
I'm trying to use the arduino mega with a TCA9548A multiplexer and two color sensors, but I'm not able to connect the arduino with the two sensors.
When I try to scan the TCA9548A it returns that ...
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3
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Which MAX3232 IC's for simple UART to RS232 converter?
I am trying make a TTL to RS232 converter.
I have designed my PCB for 16 pin SMD sop16 and max3232 CSE+. But when I was buying from a store (store link), I saw other types of max3232. I've bought and ...
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Weird short-circuit in custom Arduino
First, some background. I'm building a cockpit for home entertainment, and the parts mentioned are part of a panel with some toggle switches and backlighting. I'm an iOS developer and pilot and have ...
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