Linked Questions

2 votes
3 answers

Is there a way to increase the number of output pins in Arduino Uno? [duplicate]

I am an amateur. I know about Arduino, but I am still learning. And I was making this Bluetooth rover with a camera, ultrasonic sensor, mecanum wheels, air-soft shooter, and sand sample collector. I ...
Anik Singh's user avatar
1 vote
3 answers

How can I connect an 8-relay board without using 8 digital pins? [duplicate]

I'm looking to connect an 8-relay board to an Arduino Uno. A board like this one. However, I don't really want to use up 8 digital outputs if I don't have to. Is there some intermediate circuitry I ...
RickMeasham's user avatar
1 vote
2 answers

Upcoming Project [duplicate]

Hey guys I have a project that will require 20 I/O pins with serial communication from a computer to control each of the pins. I would like something as small as possible would a arduino micro or uno ...
cameroony's user avatar
1 vote
0 answers

How can I use Arduino Analog Uno pins as Digital pins? [duplicate]

How can I use Arduino Uno Analog Pins as Digital pins, So that I can Attach more components like sensors to the Arduino? My 13 pins are preoccupied and I want more.
Amit Nikhade's user avatar
22 votes
2 answers

Why can't I upload a sketch while other components/devices are connected to my Uno?

I wanted to make a fairly simple circuit which would flash a series of LEDs in sequence, using my Arduino Uno (more specifically, a SainSmart clone). I wrote my sketch and it compiled fine. After that,...
Peter Bloomfield's user avatar
14 votes
3 answers

Use all pins As digital I/O

Increase the number of digital pins There are many post that explain how to use more than just the standard pins on the various arduinos but none of them explain the limitations and the proplems ...
cocco's user avatar
  • 421
12 votes
3 answers

How do I use I2C devices with Arduino?

I have a few useful I2C components, such as a 16-bit port expander (MCP23017), which I'd like to use in various projects. What do I need to do to make these work with Arduino? Will it work with any ...
Peter Bloomfield's user avatar
0 votes
2 answers

Increasing the numbers of I/O pins on Arduino Uno

I want to make a game of Tic-tac-toe using an Arduino, LEDs and bouncy buttons. Hence I need nine inputs and nine outputs. But you see that an Arduino only has 13 I/O pins. So is there a way I can use ...
Clarskon's user avatar
  • 103
2 votes
3 answers

Direct 5V current based on analog signal

I would like to manage many LEDs from my Arduino - 12 or so - but I do not have the available digital pins to do this. Only one LED needs to be on at one time. Instead, I was hoping to control these ...
Rip Leeb's user avatar
  • 377
1 vote
2 answers

Light up multiple LEDs with standard Arduino Uno

I am trying to find out if it is possible to light up multiple LEDs with a standard Arduino Uno. Say I have 500 LEDs and logically I give each one of them a number from 1 to 500. In my test scenario I'...
Socrates's user avatar
  • 137
0 votes
2 answers

Arduino UNO with CD4510 Counter

I am new in Arduino but I have experience in electronics. I was wondering how can I make a countdown timer using a CD4510 and an Arduino UNO. I know you would suggest that I should connect my seven ...
Miguel Lorenzo's user avatar