Unanswered Questions
4,228 questions with no upvoted or accepted answers
-1
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MIC5891 and light bulbs: Arduino turns off
I'm trying to drive 3V light bulbs with an Arduino nano and MIC5891 shift registers.
My sample code, an animation that lights up all the bulbs one after the other, and a function that turns on a bulb ...
- 2,016
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50
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Arduino IDE stopped uploading to an Atmel SAMD51P20 device
I'm using Arduino IDE v2.3.6. I was programming P1AM-200 PLC, based on Atmel SAMD51P20, for months without any problem and suddenly program upload stopped working. It doesn't work with another ...
- 217
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1
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99
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Bluetooth HC05 refuses some AT commands
I wish to change the settings of a HC05 to create a Bluetooth server connected to an Arduino Uno. I enter command mode easily keeping the button on the HC05 pressed while powering up the HC05. It ...
- 650
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107
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Use of 3 synchronized PWM pins on Arduino Nano
I try to use three PWM pins on an Arduino Nano, each with 10kHz. I know that there are timer0, timer1 and timer3 but I wonder if I can combine them while ensuring all three PWM pins to be in sync and ...
- 650
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1
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82
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Trouble connecting Uno + ESP8266 to Wifi
I am trying to build a simple project to get data from a web server and display it, using an Arduino Uno R3 clone with integrated ESP8266 Wi-Fi.
What I have so far:
The ESP8266 attempts to connect to ...
CommunityBot
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1
vote
0
answers
72
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Issue reading sensor values with CD74HC4067 16 Channel Mux
I'm running to an issue when measuring my sensor outputs. Previously I've connected my sensors directly to Nano analog pins and measured fine, but I want to use more sensors so trying a mux. Any help ...
- 650
0
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1
answer
81
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Using Analog Multiplexer CD74HC4067 with Circuit Playground Express
I am working on a school project requiring the use of the circuit playground express. I am trying to connect a bunch of external photocells to the cpx so that it will change the color of its lights ...
CommunityBot
- 1
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0
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87
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esp_now_send takes a non-const uint8 mac address. Why? Does it modify it in some way?
I am using the Arduino IDE to do ESP-NOW communication with an ESP8266.
In espnow.h, on line 53 I find the function prototype:
int esp_now_send(u8 *da, u8 *data, int len);
Why does it take the mac ...
CommunityBot
- 1
0
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0
answers
135
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How do I ensure XIAO ESP32S3 reconnects to network?
I am writing a program for a XIAO ESP32S3 using ArduinoIDE.
The function of the program is to have the ESP open an Access Point (using AutoConnect) when it first starts up. Once the user inputs their ...
CommunityBot
- 1
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0
answers
161
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Problems to start OV5640 Camera in a ESP32-CAM board
This is the first time I write on this site, so let's go to the question but first a little bit of context:
I'm working in a esp32-cam board. I want to use a OV5640 camera to stream video but the ...
- 650
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142
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Ultrasonic sensor showing random readings
I am using a HC-SR04 ultrasonic sensor to measure the distance using an Arduino Uno. When I run this code which is worked perfectly in the previous, it only shows just random readings in the serial ...
- 650
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123
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When I try to debug using Arduino IDE for stm32 using stm32duino nucleo F767ZI throws error
I am trying to debug using Arduino IDE through STM32Duino for my STM32 Nucleo-144 F767ZI. The code is uploaded successfully, but upon pressing debug, I get this error.
Waiting for gdb server to start....
CommunityBot
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-1
votes
1
answer
83
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Using Serial Port names as a variable array for looping access to same block of code
If I have multiple NODES one on each Serial port (and / or SoftwareSerial port) all of which have the same code for execution can the names of each Serial port be put into an array such that I can say:...
CommunityBot
- 1
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0
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101
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Information about PWM frequency
Previously, the reference page for the analogWrite function showed the PWM frequencies for different pins on different Arduino boards, but now it doesn't mention it anywhere... Where is this ...
CommunityBot
- 1
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0
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109
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Cannot get Arduino Nano with CH340 chip to keep working
I have a bunch of Arduino Nano boards with the CH340 chip. When I want to upload code to a board, it sometimes works the first time, sometimes it doesn't. Afterwards, it mostly doesn't work anymore.
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- 3,172