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In the tone function reference you can read: Use of the tone() function will interfere with PWM output on pins 3 and 11 (on boards other than the Mega). analogWrite() is PWM

the second parameter of findUntil(target, terminator) is of type char* not char your Serial.findUntil(answer, '\n') doesn't work and you patched it with do while. use Serial.findUntil(answer, "\n") …

Serial.write(b) prints one byte not a string. Use print() to print strings and numbers. Serial.print(digitalRead(r1)); Serial.print(digitalRead(r2)); Serial.println(digitalRead(r3));

I made the code with if else statements is there any shorter way to do that? j = 1 + (digitalRead(k1) | (digitalRead(k2) << 1) | (digitalRead(k3) << 2) | (digitalRead(k3) << 3)); or j = 1 + d …

I want the relay to trigger and stay open only while the button is pressed. However for some reason touching pin 2 triggers the relay and sound, even if I'm not connecting it to the ground. T …

skip first line bool firstLine = true; while (myFile.available()) { int c = myFile.read(); if (firstLine) { if (c == '\n') { firstLine = false; } } else { Serial.write(c); } …

You use pins 5 and 6 for SoftwareSerial and as INPUT for sevenAmPin and eightAmPin. SoftwareSerial can't work if you set the TX pin as INPUT. I assume you didn't wire the buttons to this pins yet.

There are more ways to flash a bootloader to new AVR chip. To which you refer? If you replace the chip on Uno to burn a bootloader to it with a programmer, then it is very unclear what you are asking, …

The purpose of this board is to flash (Arduino) bootloader to Atmega 328 chips. It has not a build in programmer, only a ICSP header to connect the programmer. So wire it with a programmer and then c …

pins 11 MOSI, 12 MISO and 13 SCK are SPI bus. You can connect more devices to the bus. A 'slave select' ('cable select') pin determines which device will communicate. In your table both devices use pi …

When the serial buffer (64 bytes) is full the print waits until bytes are send away at 9600 baud.

This is the main function of the Arduino core: int main(void) { init(); initVariant(); #if defined(USBCON) USBDevice.attach(); #endif setup(); for (;;) { loop(); …

The ZMPT101b is a transformer which converts voltage. You can read the output with analog pin. The ADS1115 is an analog to digital converter. It reads the analog voltage the same way as the analog pi …

Don't use the voltage divider and never set the Uno pin HIGH. Pull io 0 of esp8266 LOW with pinMode of the Uno pin. pinMode(TO_ESP_IO0, OUTPUT); // sets the pin LOW pinMode(TO_ESP_IO0, INPUT); // …

strtok modifies the char buffer entered as first parameter. It replaces the delimiters with terminating zeros. To parse a constant string with strtok, you must first copy it into a working char buffer …