All Questions

how do you write a code for a stopwatch? I have two pushbuttons, one to start and one to stop. So the equation is StartTime (which is the time the first button is pushed) - StopTime (when the 2nd ...

I'm trying to parse with tinyxml2 a modest XML (3.4kb) to retrieve some data. My ESP8266 crashes every time I try to use the toCharArray method. here's my code // here I'm getting an http request ...

i have nodeMCU v3(esp8266) so i need to make 2 checks 1 check is the pin D1 which needs to be done continuously and another check is web link check every 10 seconds, problem is coz when i put delay ...

I'm using an MPU6050 accelerometer/gyro that controls a servo through a Mega. QSTN: The sensor simply stops reading after an arbitrary time, usually between 2-4 minutes. I have to reinitialize the ...

i have a nodeMCU v3(esp8266) and what i want is: when i send DC 5v or 3v to a pin=D1 (idk if its possible to send 5v directly to pin) then to activate the D0 for 20Seconds like this: if (D1==Sends ...

I am unable to upload code to my STM32 blue pill. I am using a Mac and it was running very well, all of a sudden, after doing something in terminal, I am unable to use it since then. I tried uploading ...

I'm creating a program that works like a piano. I have four button, a piezo buzz and an LCD screen. I'm having a little trouble with the buttonstate. Here is my program, when I run it the piezo buzz ...

I'm having problems with my Arduino UNO and the ESP8266 module. I need to send values from Arduino to my PHP web page in this way: http://www.server.com/km/db.php?id=53 the ESP8266 module is working ...

Having a hard time searching the net on how to run arduino codes on java. Can somebody please help me. Thank you.

Im currently using WifiBee ESP V1.0 and Lilypad Arduino as well as AD8232 for ECG. We are trying to send the data to mobile phone by connecting to PubNub.` if(Serial.available()>0){ str = Serial....

I am running into a strange behaviour with my code. The following works without problems on an Arduino Nano but it seems to crash on a DUE void putData64(byte* packet, int pos, uint64_t data) { ...

I want Ultrasonic sensor to sense presence of object at specify timing and trigger buzzer when object is still present at that point of time. Any idea how to do this project. Kindly advise. Thank you

I tried installing the Arduino IDE in the newly released Ubuntu 19.04 Disco Dingo. I downloaded the file from the official downloads page. I chmod +x ed the file and ran the install script. Then, it ...

I had a thought about making myself an arcade cabinet. I found a nice cheap and sturdy 8 directional arcade joystick online, and now I'm thinking about the possible ways of displaying graphics. I ...

So I have a circuit for a timer (I don't think it is the problem) Sorry for it being a little messy. And I have this code (probably the problem): // LiquidCrystal - Version: Latest #include <...

I am making a project that uses an Arduino nano and a sound detector module to power a 1m LED strip. I got the idea from this video and I am not sure how to power it. My LED strip flashes for a split ...

I am using this code to send message using Arduino Uno & SIM900A mini v3.8.2 module. But I need to send same message on multiple numbers. #include <SoftwareSerial.h> SoftwareSerial SIM900A(...

I am new to Arduino development. using Arduino IDE I can easily blink LED 13. I am a java developer so I want to try this example using java. I have gone through to Arduino And Java and found the ...

I am trying to multiply numbers from a string but i can't! I have made a code but it dose not works :: def multiply(st): m = re.findall('\d+', st) return eval(m) print(multiply('multiply 4 by 2')) ...

When I set my board to 'Generic ESP8266 module' then only A0 pin of arduino is working while all other analog pins are coming out of scope , when I set the board to 'arduino /genuino uno' , then "...

I have a JSON file stored in ESP8266, which I read need to add a value and save it back to file on ESP8266. I have an array at when saved at the first time as: JsonArray data = doc....

I am working on a project where I am implementing JSON web tokens to validate devices on a server. I have been unable to find many resources related to RS256 JWT with Arduino or similar devices. ...

I'm trying to create eyes for a project, and while I have been able to properly program the different expressions, and have them triggered by commands from the COM3 terminal, I have not been able to ...

please help me!! I'm using two arduino (uno and Nano) as master and slave. I wants to control 3 servo which are connected on Nano (slave) by uno (master). Uno have 3 push buttons on it to control ...

For my project I need a program with clock to turn on a lamp, I tried some that I found on the internet, unfortunately I can load them but they don't work because the latter don't work.enter code here

I want to develop a custom Android GPS app using GPS/GSM hardware like this one, wondering where I should look for to get started, is there an API for hardware like this? Other option I found is to ...

I have connected esp8266 with Arduino Uno and programmed 8266 with Arduino IDE to send data to firebase over WiFi. Now I also want to interface EM18 RFID Reader with Arduino in order to read the RFID ...

I'm literally as green of a noob as I can be at this moment. Been watching a ton of tuts as I plan my project, but can't seem to find anything about settings being uploaded from an external source, ...

I don't have much experience in C++ programming. I'm getting this error 'z' does not name a type!!! which I have't seen in MATLAB or python... What's wrong??? It is so simple!!! float x=10; float ...

I am working with an ATtiny13A. Now I want to interface a 16x2 LCD with it, using I2C. How can I do it? In file included from C:\Users\ASUS\Documents\Arduino\lcdi2c\lcdi2c.ino:2:0: C:\Users\ASUS\...

I have a flysky fs ct6b, which is 6 channels. As it is broadly used, well-tested transmitter, I want to make it more complex. I want to hack it. I want to control flysky fs ct6b using an Arduino-UNO, ...

I'm trying to properly program a "D1 mini ESP32 ESP-32 WiFi + Bluetooth" I don't exactly what board I need to pick and all the settings I have a Wemos D1 Mini, and the code isn't compatible with this ...

we are struggling with a project that has things (arduinos as clients) communicating to our MQTT broker (mosquitto) running on a DigitalOcean droplet (inside a docker). We have about 200 things at ...

code 1 int sensorValue; int digitalValue; void setup() { Serial.begin(9600); // sets the serial port to 9600 pinMode(A0, OUTPUT); pinMode( A0, INPUT); } void loop() { sensorValue = analogRead(0);...

I'm learning ardino programming. I have make a multi tab program for printing machine. But I have an error in the RPM counter: RPM_COUNTER.h:11:33: error: invalid use of non-static member function ...

I'm making a JSON lib dedicated for my own needs, based on ArduinoJSON v6. I try to define StaticJsonDocument<_docSize> doc in a parametric way but I get this error and I cant find the reason ...

why no output display on serial monitor? xTaskCreate( TaskAnalogRead, /* Task function. */ (const portCHAR *)"AnalogRead", /* ...

I have a project where I need to turn a 24V solenoid on for a set amount of time, then have it turn off. I am rather new to Arduino and not certain how to do this or really where to start. Ideally the ...

I'm trying to send sensor data from my Remote Control to my Bot via Bluetooth. It's 6 numbers that I would like to have read as integers on the other side. I'm printing them to Serial on the Remote ...

I am aware that there is a way to create a dump of the flash via esptool, but is there a way to read the contents of the sketch (just the sketch, not the full flash or SPIFFS) memory via the sketch ...

Hello I have a problem with my nano arduino and the nrf24l01 as receiver . I'm trying to upload my code to my board, but it say that my code have this mistake: Receiver:45:10: error: void value not ...

Last week I retried some of my Arduinos and one Mega was working without a problem, but two Uno's didn't work anymore. The error I got was something like: avrdude: stk500_getsync(): not in sync: resp=...

I'm very new to Arduino and have never used the SPI protocol before. I've tried following tutorials online, but my SPI.transfer always returns a value of 255 whether the sensor is connected or not. ...

I previously read a few guides and tutorials about the ESP8266 and i just started using the ESP-12F module as i think that it is a terrific replacement for Arduino with the added benefit of Wi-Fi. I ...

I am using the following code to check if the value is 0 e.g there is no weights placed and if so, it will ignore this value and do nothing with it. The code runs correctly but keeps outputting the ...

class RPM_COUNTER { private: volatile int counter = 0; public: void RPMSetup() { lcd.begin(16,2); attachInterrupt(0,count,RISING); } void RPMLoop() { delay(999); // ...

I'm looking to set up a 1-meter strip of WS2812B LEDs (60 LEDs) with an off-the-shelf RF LED controller with a remote. The LEDs want a 5V supply - I've tried running them off 3.7v but the colour ...

Is it possible to use Arduino (or any other MCU) to intercept SPI communication between Raspberry Pi and external SD card ? I would like to intercept CMD24 and CMD25 of SD card SPI protocol to fail if ...

I am having three Arduino UNO boards with three Bluetooth modules HC-05 connected. i.e Each Arduino board has one Bluetooth device HC-05 fixed in it. Now i need to update the firmware (Eg.Blinking ...

I'm connecting a button to ESP8266. Connection goes like this: 3v to one side of button, other side connected with GND and pin number 2 (no resistor). Every time I connect the ESP both built in LED's ...