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How do I send a string to master using i2c

I want to write an Arduino program that simply recieves a string (via the I2C wire library) from a master Arduino, then waits for a request, and sends that string back. Here is my code: #include void setup() { Wire.begin(4); …
Hoytman
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Not enough memory error using OneSheeld.h

I'm a dairy farmer and I'm new to playing around with Arduino's. I created a code to send me SMS's when my equipment stops working as it should, but I run into a "Not enough memory" error. Here's my code: #include int IPFeed = 13; …
FarmerChuck
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Having difficulty uploading sketch to an Arduino Pro Mini

Having developed and tested a project using an Arduino Uno, I would now like to upload it to an Arduino Pro Mini (5V, 328, 16MHz) for semi-permanent, long-term use, but I can't get any sign of life from the Pro Mini. I'm using the latest Arduino IDE…
Tim Morley
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How arduino PORTB pins are addressed if I want to access them with pointer?

So Let say I want to access Digital Pin 13. Thats port B pin. Is there an memory address associated with this pin 13 of Arduino Uno r3? How Port B pins are addressed with corresponding pin numbers like What is the address of digital pin…
user786
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Can I improve EEPROM lifetime by not changing bits?

In my current project I need to store the current elapsed time in hours to retrieve it in case of power loss. Since I am using a Arduino Nano I would ideally like to use the built in EEPROM without additional hardware. The written values and their…
maxmilgram
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Powering fans and arduino pro mini from single 12v supply

So, I have a 5V Arduino Pro Mini, which is running the logic behind a multi-DHT22 sensor array, and using that input to control a 12v 24mm fan (12v, 0.16 A). This is currently a working board on an Arduino Nano with two separate power supplies (1 to…
jvc26
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VSCode vs. Arduino IDE - same program, different behavior

I've got this simple program for testing DS18B20 temperature sensors. #include "OneWire.h" #include "DallasTemperature.h" #define ONE_WIRE_BUS D3 // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas…
Llaves
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Reading three signals sent serially on Simulink from Arduino

I am sending three signals from one Arduino mega to another using xbees. On the receiving end I am using these signals in a Simulink code to control servo motors. Currently it is set up to read from analog pins without the wireless set up. With the…
user734
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Ultrasonic Sensor scanning too often resulting in a whirring noise

I am using an HC-SRO4 ultrasonic sensor for a wall-avoidance, maze-solving robot. However, I have recently run into an issue where I am getting a whirring noise from the sensor because it is taking measurements way too often. This is the code I have…
RPiAwesomeness
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Connect Arduino via TX RX Pins to Computer's USB Port

I want to avoid using the big USB B connector to program my Arduino Mega. Since there are those RX TX Pins I thought, it would be possible, to connect my USB - Wires from my PC directly to those RX TX Pins. D+ -> TX and D- RX. This Post on Arduino…
Joel
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ESP32 how to preserve RTC time during brownout

I want to use the ESP32 built-in RTC clock. In my situation, my ESP32 will not have access to an NTP server I do not want to use external RTC modules ESP32 provides a pin VDD_RTC will powers the RTC domain exclusively My problem would be solved if I…
mquevedob
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How Do I Send An Email WITHOUT An Ethernet or WiFi Shield

I can only find info relating to the wifi shield, but I want to send an email without the wifi shield. For now, I just plan on leaving my arduino plugged into a computer, so I just want to use the computer's network connection. Is there a library or…
rys
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What does a delay(0) actually do?

I've seen some code where the developers add delay(0), it doesnt make sense, what does it do? Delay with zero milliseconds, why? bool DFRobotDFPlayerMini::waitAvailable(unsigned long duration){ unsigned long timer = millis(); if (!duration) { …
Sigma
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Can I corrupt my Arduino if it's unplugged during an upload?

When messing around with code and uploading a sketch to my Arduino board, I almost accidentally pulled out the USB cord. Everything is fine, but then I started thinking what would've happened if I had pulled it out. How safe is avrdude? Could it…
Anonymous Penguin
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Delay() and millis() functions don't work in cpp external files

I'm currently facing an issue using delay() and millis() functions in an external cpp file. The issue is that when I used delay() in my main program (meaning .ino file) it works well but when I call the same function in an external cpp file, I'm…
Cyril_Ram
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