Unanswered Questions
1,684 questions with no upvoted or accepted answers
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How to wire a 9v power supply to an LED matrix and power Arduino Uno?
So I've been looking for some advice but I can never find a good answer. My current project requires me to externally power a btf lighting 22*22 matrix to an external power supply. I bought one from ...
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1
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53
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MFRC522 RFID RC522 Only Works Sometimes – Unreliable Detection Issue
Problem Overview
I’m using an MFRC522 RFID module with an Arduino Uno, and it only detects RFID tags sometimes. The behavior is inconsistent—sometimes it reads the card instantly, and other times, it ...
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How to Connect/configure HC05 (Bluetooth module) to a shield?
I am a newbie to Bluetooth communication in Arduino.
I have 2 Arduino boards (one runs my main sw, second act as slave to operate a remote command coming from the main board) that i want to establish ...
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ESP8266 Not Booting Properly on First Power On – Works After Restart
I'm working on an ESP8266-based water level monitoring system using an ultrasonic sensor and an I2C LCD. The problem I'm facing is that sometimes the ESP8266 does not boot properly when powered on for ...
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1
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1
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Push button isn't pushed but keeps printing or inputting 1/HIGH
I have this Arduino code that will print 1 in the serial monitor and even prints two 1's. I haven't even pushed or clicked the push button, yet it already is already set to HIGH and even activates to ...
CommunityBot
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1
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Alternate LED Blinking Using PushButton
I have an task for my class where we have to make 2 LEDS blink alternatively using a pushbutton. I've figured out how to do the blinking and alternating but from time to time one of the led would go ...
CommunityBot
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1
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FastLED with WS2812B 241228
Hello Arduino Stack Exchange forum,
Learning how to use the FastLED to control a string of 150 WS2812B LEDs
Code copied herewith below compiles and operates as expected.
Trying to figure out how to ...
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2
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50 Hz powerline noise using Arduino and mikroe ECG 2 (ADS1194)
I am trying to take ECG measurements using the Mikroe ECG 2 (ADS1194), connected to an Arduino Uno via an Arduino Uno Click shield.
I am able to measure the ECG, and can read the heartbeats somehow in ...
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votes
2
answers
59
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Reading the state of a pin at 35V using arduino at 5V
I have a gate controlled by a motorline MC2 motherboard. I want to add a distance sensor controlled by arduino so that I can give it the opening command when leaving the yard.
From what I have seen, ...
- 2,303
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1
answer
54
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Running full voltage through Transistors
Hello I am trying to create a fan controller using Arduino. The (Placeholder LED's) fans run at 12V 0.23A DC so I have an external power supply for them. I plan to control the flow of this with NPN ...
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ESP8266 (Mini D1) does not come back after deep sleep but NodeMCU does
Kind of desperate here. I tried every solution found on this forum / google and others.
My sketch works perfectly with a NodeMCU 1.0
The same script should work on a Lolin Mini D1, everything works ...
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votes
1
answer
133
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How many FPS I can theoretically get for streaming frame from OV7670 with this setup?
Setup:
OV7670 -> STM32F103... --USART--> ESP01 --UDP--> Gateway --> Internet --> Server
I want to achieve a real-time streaming experience.
Here is my analysis:
According to the ...
- 1,525
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votes
1
answer
90
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How to run G code with SoftwareSerial?
I'm trying to build my own CNC machine. Since I need to control a large number of motors at the same time, I want to control it via an Arduino master and several slaves with CNC shields. Now I'm ...
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3
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1
answer
165
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Error trying to play audio through an ESP8266 using the 'ESP8266Audio' library
I am attempting to use an esp8266 to play an .mp3 audio file through a connected speaker using the 'ESP8266Audio' library.
I have tested that the hardware setup is correct (e.g. I have been able to ...
CommunityBot
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1
vote
1
answer
187
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LCD display connection without a resistor
Can run a LCD without a potentiometer or a resistor?
I don't have any.
Here it said to connect both:
CommunityBot
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