How to increase your microcontroller input and output pins?

How to increase your microcontroller input and output pins?

Digital I/O Expansion – How to increase your microcontroller Input and Output pins. How to expand your interfaces using digital I/O serial techniques. You are probably here because you have run out of I/O pins. Prossibly: Maybe you only have one pin left unused and need to add a few more functions.

What to do with unused pins on a microcontroller?

In a typical microcontroller design, it’s normal to end up with some unused pins. These may be general purpose inputs and outputs or pins that are merely labeled as “NC” in the datasheet. The quick and easy solution is to leave these pins unconnected as this means less routing for the hardware as well as less space occupied on the PCB.

How to add more functions to a microcontroller?

You need to add hundreds of temperature sensors and want to use only one microcontroller. You really don’t want to route tons of new wires on an existing design. Using One-Wire, SPI or I2C devices can solve these problems. The way to add more functions to a pin limited system is to use serial communication.

How to increase digital I / O in a microcontroller?

This is an example Arduino TM Project that uses a 4 wire SPI device (MAX7219) for digital I/O (actually in this case just for output) adding 64 LED outputs. In addition you can cascade multiple MAX7219 devcies for unlimited I/O.

Where are the I / O ports on a microcontroller?

I/O port pins for the LM4F120H5QR / TM4C123GH6PM microcontrollers. Each pin has one configuration bit in the GPIOAMSEL register. We set this bit to connect the port pin to the ADC or analog comparator.

Are there any serial ports below the node MCU?

The based below the Node MCU can provide more flexibility on the connection ports to support more sensors. Besides, it also has 12V input port and able to provide 5V power supply to support the sensors. Support us by purchase it from our affiliate link here !!!

What does softserial ports do to a MCU?

This means softserial ports adds heavier load on the MCU. However some of the peripherals don’t need constant communication with the flight controller and sends/receives the data occasionally.

How to setup a NodeMCU as an input?

In the setup (), you initialize the button as an INPUT, and the LED as an OUTPUT. For that, you use the pinMode () function that accepts the pin you are referring to, and the mode: INPUT or OUTPUT.