Questions tagged [programming]
The process of designing and writing source code as part of a program (or sketch) for Arduino. For questions about uploading code to an Arduino board, use the [uploading] tag instead.
1,653
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TowerPro MG995 cannot just rotate 90 Deg [closed]
I want to code a program that commands the servo motor only rotate 90 Deg but it keeps turning and not rotating 90 deg, this is my code
#define Servo_PWM 6
Servo MG995_Servo;
void setup() {
...
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23
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Arduino IDE: Delays in void loop() prevent counting number of switches
How can I count the number of prox switches and at the same time reference this value for conditionals within loop()? The delays make my loop counter stop adding. I need to know the total number of ...
1
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1
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73
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Make two LEDs fade in and out with with different PWM values
I have two UV leds, one Vf 3.3V @ 150 mA and the second one Vf 5V @ 150 mA. I need a circuit to make them fade in and out alternatively, i.e., as one goes dimmer the other goes brighter and vice versa....
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is #ifdef __SD_H__ considered a bad practice?
Say I'm working on a library^1 to which I want to add support for SD.h^2 but knowing for a fact that many microcotrollers don't support SD.h (therefore they result in compilation errors [eg. Attiny85])...
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4
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2
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308
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"if" condition problem / question
I'm new to Arduino and my question is rather theoretical. I have an Arduino Nano board (Atmega168 processor), a button, a display. I have written a button handler that does not stop code execution. My ...
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25
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MKR GPS shield inconsistent GPS connection/data printing...library issue?
I have been using a MKR WiFi 1010 board with GPS shield for a very long time (year+) and have not been able to solve my problems with the GPS data dropping out.
The setup for my field application is a ...
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52
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Unable to program with AVR ISP mkII under Linux
I just got an AVR ASP mkII external programmer and I am unsuccessfully trying to program my arduino with it.
All the settings in the IDE are correct. This is the error message that I am getting:
...
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1
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99
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Problem with Bing generated code for automated chicken coop door
Glenn from Sweden here. I was wondering if some kind soul could help me out here.
My partner bought a cheap chinese knock-off automatic chicken coop door that operates based on sunlight. Link to the ...
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1
answer
80
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Read values from a txt file on an SD card
I'm trying to read a text file (has numeric values) from SD card. The values in the file like this
87 512
255
I need to read 87 in ch1 and 512 in ch2 and 255 in ch3.
Why did I get on 'SKIP_NONE' '...
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1
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115
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convert string representing a binary number to binary
I have a serial input "1111111" and I would like to convert this to a binary B1111111 that I can send to a led matrix.
I tried to search, but, all the results were misleading, led to full ...
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81
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ArduinoJson reading `null` from Serial
I have a setup that reads from serial when I sense that there is something to be read (and always assume that what is sent to the arduino is valid json):
void setup(){
Serial.begin(9600);
...
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How to add one JsonDocument to another in ArduinoJson
I'm utilizing this json library: https://arduinojson.org/
I am attempting to write a function that creates a response object, and wraps an already built json document:
void sendResponse(
...
- 181
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1
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74
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SPI with DMA in a Arduino Due
I have a project where I need to store data (~16Mo) on a memory and be able to fetch the data fast (<36000bits/s) with DMA because I have other signals to take care of.
Currently I use a SD card ...
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Salvaging Arduino board from Google ADK 2012
I found an old Google ADK 2012 in my closet and remembered it came with a Arduino board (?), an ARM 32-bit Cortex M3 micro-processor available at the time (possibly the DUE).
The ADK 2012 design files ...
- 109
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109
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How to use multiple PN532 over i2c bus(es) and SPI?
I am working on a project that involves 3 PN532_modules to an ESP32, which sends the Tag_ID over BLE.
Plan A was to use One module on i2c_1, second on I2C_2 and third over SPI.
The SPI one works as ...
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1
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70
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Programming barebones ATMega328 with external programmer and no bootloader
I have created a circuit with a barebones ATMega328.
I also have an external programmer (Sparkfun's Pocket AVR Programmer)...
Now I want to program a particular sketch... When uploading a sketch, do i ...
- 1,385
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1
answer
63
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Functions delaying gesture sensor recognition
I am working on a simple little robot to cure my boredom and all it has is a 64 x 32 OLED for the eyes, and a PAJ7620 Gesture recognition sensor with a Seeeduino Xiao as the main board.
Basically, ...
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2
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101
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How much readable text can fit inside an ATTINY85? Feasibility of scrolling a booklet on a 0.91-inch OLED display
I'm a total beginner, so I've been talking with Chatgpt regarding the capabilities of the Attiny85 microcontroller. But the AI would hallucinate a lot and give only partially right answers (because it ...
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106
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Arduino NANO RF reciever and Digispark Attiny 85 transmitter issues
I am trying to send RF signal from Digispark Attiny 85 (this one) and receive the signal with Arduino NANO V3.0 ATmega328 (this one). Transmitter and receiver are STX882 and SRX882 (these). Library ...
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How do I set the DHCP pool for an ESP-WIFI-MESH? [closed]
I'm building a mesh with ESP32 dev kits (ESP32-DevKitC V4) using the ESP-IDF VS Code extension and the ip_internal_network example project. The code for the example, common project components, and the ...
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1
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327
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Problem when coding 4x4 keypad's key detection (without library)
Part of my current assignment involves reading the input from a 4x4 keypad connected to an Arduino UNO. While this may be done easily using <Keypad.h>, the project is being done with Tinkercad's ...
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Can I use regular pins (Example: D2, A3, etc...) as serial (RX, TX)?
Python/Arduino Beginner here...
I have a DFplayer I am trying to hook to my Arduino and I want to hook it up through the regular pins instead of the RX and TX pins, but I've not been able to find ...
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1
answer
64
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Improving moving mouse loop to optimize speed
Code:
#include <Mouse.h>
#include <hiduniversal.h>
#include "hidmouserptparser.h"
#include <USBController.h>
USBController controller;
USB Usb;
HIDUniversal Hid(&Usb);
...
- 23
3
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0
answers
51
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nano 33 BLE problems with reading RC signal
I'm using an Arduino Nano 33 BLE and a L293D motor driver to control a three-wheeled RC robot. The sketch I'm using worked fine with my Uno Rev3, but I've moved to the Nano for size/weight reasons, ...
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1
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2
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189
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How do I turn on 3 LEDs in a repetitive sequence where all three LEDs would then turn OFF when the push button used is released?
Basically, how do I modify my code listed below to turn ON each of the three LEDs one at a time in a repetitive sequence while keeping the push-button pressed?
Red (3 sec),
Yellow (1 sec), and
Green (...
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3
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1
answer
170
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How do I use a transmitter and receiver to send string messages conditionally to a receiver?
I'm working on a project to build a plant monitor that works from the outside with Arduino that picks up light and water values from it's environment then uses a nRF24L01 with an antenna and I've come ...
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1
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233
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How to drive two Stepper motors and use an Ultrasonic sensor together?
I am working on an autonomous robot using two 4-pin stepper motors, HC-SR04 ultrasonic sensor, 2 L298N motor drivers (one for each motor), and an Arduino Uno. My problem is that when I use the stepper ...
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83
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How to write single binary code to output pin
I am relatively new to arduino and coding in general and im just looking for a code to write a single string of binary code e.g.; "01000111101"
To a specified output pin instead of copying ...
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1
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89
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Arduino-project with color sensor and rgb-led
I want to use a color sensor for my Arduino project with Arduino Uno to detect the colors red, green, blue, orange, yellow purple of leaves of paper and then light my RGB led in those colors. I have ...
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74
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how to config size USB mass storage arduino nano ble 33?
I see that they arduino nano ble 33 support USB 2.0. Is there a way for us to create a USB mass storage of about 200kb for convenient storage of configuration files and history files?
I see example ...
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1
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212
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RFID card read loop seems to stop
I successfully programmed an RFID card reader to switch lights on and off if any rfid card is presented. I have tested this and it works, with the lights continually switching on and off if any rfid ...
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134
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What is the most simple sketch to confirm the DAC works for audio on a speaker with it's own amplifier for an ESP32?
I have a PC speaker with it's owner power supply (no amplifier needed). It just uses a standard AUX jack.
Most examples sketches use an amplifier like the MAX98357A. I have explored some libraries too,...
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Help with program upload problem!
I'm gonna to upload some code to my LeArm using an Arduino board. I connected the rx and tx pins of the LeArm to the Arduino, but I got an error message when I tried to upload the code. I'm not sure ...
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175
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How can I program an Arduino Pro Mini with an ESP8266-01 connected to its TX and RX?
I am working on a project that uses an Arduino Pro Mini to gather information from various sensor. Once the readings are taken I turn on an ESP-01 from a separate dedicated 3.3v power supply. The ESP-...
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146
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if statement does not work with fraction, but works with decimal equivalent
I'm trying to trouble shoot a problem with my code and narrowed it down to my if statement not working with a fraction.
The below code does not work and returns 0
for(float i=0; i <= 1; i += .0001){...
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1
answer
29
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Creating an IPAddress object from an unsigned int
If I create an IPAddress object using a decimal IP address, it appears to be reversed.
What am I doing wrong? See code examples below.
IPAddress addressOne(192,168,50,1);
Serial.print(addressOne); ...
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0
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54
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How to save the current SPI settings with out have a global variable keeping track?
I am making a function for one of my devices, my device needs a particular SPI setting. I was hoping to save the current setting of the SPI class into some variable, load in the required setting, do a ...
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2
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103
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Lora to Mqtt sensor cannot be read
I'm trying to transfer data from a temperature sensor that is located outside my wifi area. I have chosen the Lora technology between an ESP32 equipped with an SX1278 and a TTGO Lilygo lora.
So far ...
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1
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177
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how to "skip" one parameter of a method with a default value letting it use it's default value, but change parameters after it [closed]
lets say we have a function like this(fictional):
function1(int Z, int X, bool Y=true, int Count=10, int ID=1,bool TeaTime=false);
And I want to run this function, but I want to change all parameters,...
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297
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ESP8266 not sending text message to telegram bot
I've been trying to get my esp8266 to send a message to a telegram bot as soon as it connects to the wi-fi, whenever it encounters an obstacle, or whenever an SOS push button is pressed. But I didn't ...
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3
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1
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156
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Arduino hangs / freezes - can't figure out why
I am building a remote controlled boat. My remote project freezes after an arbitrary amount of time. The serial stops output, the OLED doesn't update anymore and instructions are not send / received ...
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0
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34
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Atmega328P constantly restarting when defining a function
I wanted to make a simple led on/off program using USART interface. When the code doesn't have any functions other than main it runs fine, however Arduino keeps resetting when one is included. At this ...
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1
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143
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Using internal voltage reference for sensor
i am using 3.7~4.2V lithium battery. I am using internal voltage reference to read constant battery voltage as we know that the battery voltage level depletes overtime. The problem is that my sensor (...
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1
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235
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Will an Arduino Nano work instead of Teensy 3.2?
I hope this is ok to post here and I appreciate any suggestions or help and opinions/facts to make this work.
First off I’ve Never programmed an Arduino device!
I was looking at this project:
https://...
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1
answer
102
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RGB LED randomized colors and LDR fading at the same time
Im trying too make an RGB LED that keeps changing color's randomly, and makes the brightness fade at the same time with an LDR, yet I keep getting an error that says too many arguments to functions.
...
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2
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281
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How does Arduino handle passing this union?
I'm unsure how this will be handled by the Arduino compiler. If anyone can explain what and why, I'd appreciate it. This is obviously very simplified, but it does contain the actual issue.
At the ...
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1
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93
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Arduino code giving error while compiling [closed]
I am a beginner, and I'm trying to make code to control a servo using two ultrasonic sensors.
I've tried to make the code, but when I tried to compile it using my simulation app, it gives this error:
...
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1
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118
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is there Raw RTC output?
I have an I2C Real Time Clock, DS3231 RTC module , and I just want something like Unix Time.
I'm using the uRTCLib, looking at the class methods
but dont see anything like that. I'm thinking there ...
- 882
3
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1
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116
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Detecting an approximate angle/location of a light source using phototransistors
Note: [I am approximately two weeks into learning Arduino and hence have little experience with utilizing Phototransistors.]
My plan revolves around placing four identical Phototransisors which are ...
-1
votes
1
answer
163
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4x3 keypad not providing any output and the output it does provide is incorrect
I am trying to figure out how to use a 4x3 keypad and just want to receive the key numbers I select on the serial monitor. The problem I am getting is that some of the keys I type don't give me any ...
