Questions tagged [arduino-nano]

The Arduino Nano is a small board based on the ATmega328 or 168. It has male headers, so it can be plugged directly into a breadboard. It is small and compact, and features a USB chip.

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difference between the nano and the nano every

So I wondered what the difference between the nano and the nano every is and why the nano every is so much cheaper than the nano. I'm new to the microcontroller business and I would like to know ...
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How to measure the supply voltage of Arduino without using an analog pin

I'm using Arduino Nano to measure temperature with a 10 kohm thermistor and a voltage divider. My problem is I'm getting only 4.2V on the 5V pin. The power is supplied via a USB cable from a desktop ...
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294 views

Arduino timer interrupts for PID

I'm working on a robotics project where an arduino nano is acting as the motion controller. I'm trying to use a trapezoidal motion profile generator and PID loop to follow that profile, but I found ...
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Absolute noob looking for troubleshooting help

My 10-year-old son went to a "Robotics Camp" and came home with a non-functional Arduino robot. I figured it shouldn't be too much trouble to get it working. He swears he had it operating at the camp, ...
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337 views

Problems running several Arduinos off of one HC-05 Tx pin

TL;DR: Multiple Arduinos listening to a single serial rail are burning out my HC-05's TX pin. Arduinos are leaking voltage onto the signal rail. How do I stop, or isolate that to keep from burning out ...
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Arduino stopwatch, which board to use?

I am planning on making a simple stopwatch with: A display One or two additional buttons to start the stopwatch and stop the stopwatch and maybe reset it. The problem is that it has to be as small ...
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Arduino controlling a heavy solenoid water valve

So after burning up a couple Arduinos, I'm running out of ideas... I am trying to power both a Solenoid valve and the Arduino(nano) with the same 12V-2amp power supply. I've tried it with both a ...
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Is there a way to shift through sensors

We are doing a project and have to use around 25 temperature sensors. Is there a way to shift through them on one Arduino similar to using a shift-register? It is a set of analog sensors in a fridge.
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Arduino Uno versus Arduino Nano power consumption

I have both an Arduino Uno and an Arduino Nano but I can't decide which one to use for my project. My aim is to maximize battery lifetime. I have also implemented an 8-second watchdog timer to ...
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Use ESP-01 with Arduino Uno/Nano, with the ESP8266WiFi library

There is this library - https://github.com/esp8266/Arduino That provides a more user-friendly API for WiFi capabilities with the ESP8266. However, all tutorials that I found so far for this library ...
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Best Header for Arduino Nano

I would like to be able to create permanent projects with my arduino Nano but be able to remove the nano in order to use it in other projects. The arduino Nano has 30 pins so I would be looking for ...
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How to use digital pin as ground?

I have recently brought an arduino nano. It has only two ground pins but I needed three for my project. Is there a way to use a digital or analog pin as ground pin? Please show me how to do it
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What happens if we connect GND and +5v?

What will happen if I by mistakenly connect GND and +5v of an Arduino Nano? Is there any protection for it? Or will it get short and fry out something?
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Battery solution Nano 33 iOT

Since the Nano 33 boards are quite new right now, I haven't found any details on how to hook one up with batteries. I'm pretty daft when it comes to electronics (I'm a software man), and I read that ...
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Weird output from chained 74HC595 shift registers

EDIT 4/2/18: The Arduino tutorial schematics have been corrected! See https://github.com/arduino/Arduino/issues/6433 for that issue. I have a project where I am trying to load a 16-bit number onto an ...
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How to Sort Elements of Array in Arduino Code? [closed]

/How Can i Sort this Array with Descending Order? I need Simplest syntax to use in iterative code. lt[6]={35,15,80,2,40,110};
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Extend program space by getting rid of bootloader on NANO

I just have a complex program that runs on a NANO. Now when I use my printlns for debugging I am running out of memory. I read about using a programmer to get rid of the bootloader that uses 2K space ...
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Arduino Nano - programmer is not responding

I cannot seem to upload the simple blink program to my Arduino Nano. I keep getting the message: avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in ...
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Can’t set duty cycle to 0% with custom PWM

I'm trying to control a heating element with PWM with an Arduino Nano, but the problem is even if I set the duty cycle to 0 it gives a tiny spike. I want to generate a square wave of 1Hz and that's ...
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How Do I Control the Onboard LEDs of My Arduino Nano 33 BLE Sense?

I picked up my Arduino Nano 33 BLE Sense for the first time in a while and ran the classic "Blink" sketch to make sure it was alright. After slight usage, I wanted to play with the onboard ...
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223 views

Measure audio frequency through pulse duration

Hello dear StackExchange users, i want to develop an Infrared blaster which i can plug into the headphone jack of a phone or console of choice. In order to communicate what frequency to modulate the ...
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How to use a Bi-color matrix led 8x8 with 24 pins?

I've just buy this 8x8 LED matrix WLG M20088A/BEG and I'm trying to light all the LEDs in one single color (green) but I don't understand how the 24 pins work for this specific model. I know that ...
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Arduino Nano randomly resetting

I am currently struggling with an intermittent problem with an Arduino project. Background I am using a LabVIEW program to control a few pieces of hardware. One of them is a NEMA 17 stepper motor that ...
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Could I Connect many Arduino Nano boards together?

I want to know if I could connect many Arduino Nano boards together (Example : 10 boards ) , Also i want to know if there is any problem in Communication between them using I2C , could this affects ...
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Arduino Pro Mini maximal and recommended current per pin

In Arduino Pro Mini (3.3V) specs indicated the maximal and recommended current per pin, 40mA and 20mA respectively. Does these values means input current (i.e. safe input current Arduino can handle) ...
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433 MHZ connection between two Arduino (nano,uno) fails after some time

The goal of this part of my project is to establish a wireless connection between an Arduino nano and an Arduino uno. For this I use 433 MHZ receiver and sender. The nano sends, the uno receives and ...
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Prevent flash cloning

I need a way to prevent someone from cloning code from arduino. Without protection it can be cloned with advdudees in 2 min. I'm using atmega328p chip on nano. In this state arduino acts as a ...
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1answer
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Anyone know why my pushbutton is always returning HIGH?

Been trying to figure this out for a couple hours, despite how ridiculously simple it should be. I have no idea why it's always returning 1, even when i'm pushing the button. Fritzing sketch: My code:...
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606 views

EEPROM size limitation issue

I am creating a test program with Arduino Nano where I can save network and password. Here is my code to start with: void SaveNetwork(String ssid, String pass){ String com = ssid + "~" + pass; ...
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How to detect if LED is switched on in external circuit using Arduino NANO?

I want to detect when an LED is powered on using an Arduino NANO. The LED is part of an external circuit. The LED uses about 1.8V. Would the circuit below allow me to detect when the LED is switched ...
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Purpose of this resistor in Arduino Nano schematic

I was looking at the Arduino Nano's schematic and noticed a resistor that seems to be pointless (RP2C on this picture). Also there is numbers 6 and 3 on it, does it mean that resistor is connected to ...
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More than 4 MCP23S17 on 1 SPI bus

I would like to use 7 MCP23S17 as output expanders on one SPI bus. Every IC has its own address from 0 to 6. The first MCP23S17 can be written with no problem. The second chip did not work properly. ...
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Arduino Nano gives 7V on the 5V PIN!

I have an Arduino Nano which is Powered by an external Power supply. This is connected with VIN and GND. The voltmeter says, there are 12,12 V I have some components connected on the 5V PIN, which ...
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Using Arduino Nano as USB Host

I'm pretty new to microcontrollers and Arduino and since I can't find any satisfying information on my problem, I hope that you might answer them: My project is actually quite simple: I just want to ...
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1answer
596 views

Building Arduino Nano from components

At this stage, my finalized design includes Arduino Nano 3.0, a breakout board and a few electrical components on a breadboard. Will there be an appreciable cost savings from not buying a ready-made ...
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Touch Sensor and Potentiometer - Need some help

I'm using an Arduino Nano with a capacitive touch sensor and a potentiometer. I'm trying to get my code to differentiate between three different program states. One is when my touch sensor is NOT ...
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174 views

How to program Esp8266 remotly via wifi?

I hope it's not a sci-fi for arduino. But I saw that dual system with two MCU can program each other via radio connection. It has been done in experimental space cube projects. It is theoretically ...
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1answer
953 views

Arduino nano 33 ble vs ble sense. Power consumption, etc

After working with an Arduino Uno at work, I am looking to buy myself a board for some projects/experiments at home. The nano size seems like a great option, especially the one without soldered ...
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I2C - Confusion

It's not often I ask a question. This one has me a little stumped though. Scenario: I have an 328PB (internal 8mhz), it speaks to a multiplexer on Wire1 (the PB's second IC2 - Minicore lib). The ...
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837 views

Using AA batteries to power Arduino and GPS unit

I'm more of a software guy, so I need your help to figure out the power issue with my Arduino. What I would like to do is using a GSM/GPS unit (Ai-Thinker A7) with Arduino Nano as a car tracking ...
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PWM multiplexing on Arduino nano

simulate this circuit – Schematic created using CircuitLab Its a simple project. I am trying to drive 3 RGB LEDs using Arduino Nano. Since Arduino Nano does not have 9 PWM pins, the only ...
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1answer
107 views

PT2257 only gives me heavy buzzing sound

I have this project where I control a bluetooth audio module with an arduino. In this case, I have used an arduino nano. But then, I have been meaning to add volume control to the project so I use a ...
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Risks when commanding multiple chips with same address via I2C

I know that I2C devices are supposed to have unique addresses when used. What if I still use multiple devices with the same address, what can go wrong? Let me describe the situation: I have multiple ...
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1answer
510 views

Forwarding serial output from a Nano to Uno that's used as the ISP

I'm trying to program a Nano by using an Uno as the ISP. So far, I've followed along with the example project for getting the Uno running as the ISP on https://www.arduino.cc/en/Tutorial/ArduinoISP. ...
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How can the Arduino check if it is connected to a PC and the PC is on?

I have been searching around the Internet to find if there is a way to check whether an Arduino is connected to a PC or not. For example: if my PC is turned on, the Arduino will listen to any serial ...
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871 views

Sampling frequency

I am an undergraduate student at a public university in Maryland. I am currently doing a project with an arduino and I came across a problem that I could not figure out after several days of ...
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592 views

LM335Z temperature sensor gives very varying values

I'm trying to get consistent values from the LM335Z temperature sensor. But it behaves very strange. I'm using an arduino nano and it's powered via USB from a Raspberry Pi. The circuit also has two ...
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Keypad - Speaker - Interference

I am trying to build a system, that plays specific audios (.wav files) from a SD-Card, according to the key combination that has been pressed. I am using: 4x4 Membrane 4 Ohm Speaker MicroSD Card ...
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nRF24L01+ problem with receiving response

I'm sending currently data from a Raspberry to an Arduino, but I have a problem with receiving response from the Arduino back to the Raspberry: Sent the message: ['H', 'i', '.', '.', 'A', 'r', 'd', '...
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Interconnected Arduinos via digital pins and magnets

Before i get too far into the design phase of a project i have in mind, is there a way to connect arduinos in a non-master/slave manner to pass a few different combinations of HIGH/LOW (say 5) or '...

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