Community Digest

Top new questions this week:

Arduino Array Scope with SPI

when I try the following code the SPI works correctly (see oscilloscope plot) #include <SPI.h> void setup() { SPI.begin(); } void loop() { SPI.beginTransaction(SPISettings(100000, MSBFIRST,...

arduino-mega spi  
asked by user1441016 4 votes
answered by VE7JRO 5 votes

HTTPClient works with localhost but not server

I started to work with HTTPClient and the WiFly library to connect to an SSID and then send POST data to a server. When I was sending the data to my localhost, it was working on localhost, but when ...

arduino-uno wifi http  
asked by Chris Fodor 2 votes

Read & Write to EEPROM

I need to implement EEPROM Read & Write functionality to my project. I've been learning how to use the EEPROM on the last few days, however I'm struggling to Read & Write Strings to EEPROM. ...

arduino-ide arduino-nano c++ string eeprom  
asked by Berig 2 votes
answered by Edgar Bonet 2 votes

Using CD74HC4067 16-Channel Analog Multiplexer Demultiplexer is not working as expected

I am working on a project that needs multiple digital signals and I am considering the CD74HC4067 (on a break-board) to work as a multiplexer. More specifically i am trying to build a keypad with ...

arduino-nano multiplexer keypad  
asked by thermike 1 vote

servo keeps rotating

so i plugged a 360 degree servo into a program i made on an arduino uno. the program was meant to control two separate servos with two potentiometers on a breadboard. when i used 180 and 90 degree ...

arduino-uno c++ servo potentiometer  
asked by aaron vu 1 vote

LILYGO TTGO T-Display cannot detect MPU 6050 Accelerometer, Gyroscope and Temperature Sensor

I've been trying to connect a MPU 6050 Accelerometer, Gyroscope and Temperature Sensor to a LILYGO TTGO T-Display to get readings displayed on the serial monitor (for starters). The wiring is pretty ...

i2c esp32 nodemcu display mpu6050  
asked by C Vith 1 vote

Is there any way to secure Esp32 BLE server?

I've got a project in which currently I am using Bluetooth classic (with SSP - Simple secure pairing) to communicate to my esp32 board with my android app, but Bluetooth classic serial communication ...

arduino-ide esp32 bluetooth ble security  
asked by Piyush 1 vote

Greatest hits from previous weeks:

Sending and receiving different types of data via I2C in Arduino

I have found a few good tutorials on how to send and receive data via I2C in connected arduinos. My limitation is now how to transmit different types of data like for instance, long, float, etc. Right ...

arduino-uno i2c wire-library float  
asked by Camilo 7 votes

What can I do if I run out of Flash memory or SRAM?

According to the Arduino documentation, the ATmega328 has 32KB of Flash memory for the bootloader + uploaded sketch, and only 2KB SRAM for runtime data. The ATmega2560 has quite a bit more, totalling ...

flash sketch-size  
asked by Peter Bloomfield 30 votes
answered by Peter Bloomfield 32 votes

CH340 Nano avrdude: stk500_getsync() not in sync resp=0xa4

I'm trying to upload some code to an non-arduino nano with the CH340G chip, and the avrdude refuses to let me upload. The error I'm getting is: Using Port : COM4 Using Programmer ...

uploading windows ch340  
asked by Jacob 9 votes
answered by per1234 16 votes

Whats the difference between RF options (wifi, xbee, NRF24L01)

When doing RF, you have many options. Three of the most basic are in the title box WiFi Xbee NRF24L01 What are the practical differences in using them. What is the purpose of each other and the pros ...

wifi xbee rf  
asked by user1584421 31 votes
answered by geometrikal 45 votes

Turning all LEDs on (FAST.LED)

In Fast.Led lib for arduino there is a code to turn off all leds FastLED.clear (); Is there also a shortcut to turn all LEDs ON, and with a specific color

arduino-nano adafruit  
asked by Niles 9 votes
answered by Rob Hilken 10 votes

Warning when verifying sketch with VS code

I use Visual Studio Code to develop for arduino which uses Arduino Studio installed files and needs the installation to work. This works very well. Annoying is that when verifying a sketch it takes ...

compile ide  
asked by Uwe Hafner 29 votes
answered by Uwe Hafner 31 votes

Keyboard.h not found

I keep getting this error message: "'Keyboard' not found. Does your sketch include the line '#include <Keyboard.h>'?" ... when I have already included Keyboard.h. #include <Keyboard.h> ...

asked by chin hui 4 votes
answered by Greenonline 3 votes
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