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Newest 'pins' Questions - Arduino Stack Exchange
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Learn more about TeamsQuestions tagged [pins]
"Pins" are like gateways between the Arduino code running on the chip and the components attached to Arduino. It can refer either to the physical connectors on the board, or it can refer to the pins defined in the code.
484 questions
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0
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0
answers
78
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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 ...
0
votes
1
answer
142
views
STM32 PWM on standard GPIO pins
I'm using an STM32F407ZET6 with the Arduino core support in PlatformIO. CPU has an external 8MHz crystal running at 168MHz. I have a project where I'm already using UART1, I2C1, SPI2 and SDIO (1Hz ...
0
votes
2
answers
58
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Using TX as gpio, while using RX as serial pin to read data from other uC - Arduino atmega8
I am having a circuit that I am using the RX pin to receive data (int) from other uC (ESP12E) as one way communication, and for the lack of pins I had to use the TX pin as GPIO for a digit of a seven ...
-1
votes
2
answers
290
views
Open drain without pull-up
Looks like I didn't make myself clear, sorry. Update to clarify things / TL;DR version:
4 Arduino UNO pins are connected to respective DE-9 pins, responsible for UP, DOWN, LEFT, RIGHT directions
...
-2
votes
1
answer
141
views
Controlling Vintage floppy drives
After researching a solution to a problem I want to solve, I'm hoping the third time posting is a charm. :)
I'd like to use an Arduino to control a vintage floppy disk drive. I'm looking to use it as ...
0
votes
2
answers
366
views
How to Identify pins connected to each other?
There is probably another way to achieve what I want without connecting pins to each other, so I will explain the scenario:
I am trying to build an Arduino based Enigma Machine. The cryptography is ...
1
vote
3
answers
781
views
Confusing Pinouts on MH-ET ATTiny88
I am a little bewildered about the analog pins on the Arduino ATTiny88.
First of all, am I correct in thinking the functions analogRead() and analogWrite() can use either the string A0 - A7 or a ...
-2
votes
2
answers
67
views
Physically passing through a pin to access another [closed]
I would like to know about physically passing through a pin in order to get to another. For instance, if I have a sensor on one side of an ATMEGA328P or ESP8266 (Wemos D1 Mini) yet need to connect to ...
3
votes
2
answers
499
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Why isn't pin 6 on my Adafruit Feather RP2040 being sent high when I ask it to?
I have an Adafruit Feather RP2040 (pinouts) connected via pin 6 to a relay. The code (below) triggers the relay when a separate color sensor returns "enough" red values.
The color sensor ...
0
votes
2
answers
156
views
Just one more pin!
I have an Arduino project to control a motor's speed at 3 levels, indicated by 3 LEDs, so level 1 is speed 1 and LED 1, and so on for levels 2/3.
Also, I added a low-battery voltage indicator to ...
1
vote
1
answer
81
views
Weird behaviour with BearSSL on GPIO ESP8266
I use GPIO 5 to trigger a relay. My code also connects with a secure MQTT connection for which I have to use the BearSSL certificate definitions.
Without the BearSSL certificates, when the ESP ...
4
votes
2
answers
1k
views
Trying to resolve invalid conversion from 'byte' {aka 'unsigned char'} to
I'm trying to use an existing Arduino library on the Raspberry Pi Pico. The library is here:
https://github.com/j-bellavance/EdgeDebounce/tree/master
It's based on some interesting insight at Jack ...
1
vote
0
answers
87
views
Selecting the Right GPIOs
I've bought this 4 relay ESP8266 board to active lights and window shades.
In an odd way - its relays are not pre-connected to a certain IO's but let you choose which IOs will operate relays (by ...
2
votes
2
answers
484
views
Barebones AVR - Connecting RESET pin to Vcc
I want to build my first barebones AVR circuit.
I plan on NOT having a RESET button. For this reason, is it valid if I connect the ATMEGA's RESET pin to Vcc directly?
What I mean by this, is that in ...
4
votes
0
answers
81
views
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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Related Tags
arduino-uno × 147
programming × 38
esp8266 × 36
arduino-mega × 34
sensors × 32
power × 29
led × 27
serial × 22
i2c × 18
arduino-nano × 18
port-mapping × 18
wires × 16
input × 16
pwm × 15
hardware × 15
digital × 15
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motor × 14
shields × 14
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arduino-ide × 13
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