sparkfun Qwiic GPIO Hook-up Manual

  Introduction The SparkFun Qwiic GPIO is an I C device aimed at simplifying adding extra GPIO pins to a microcontroller. The board uses the TCA9534U I/O Expander IC from Texas Instruments to add up to 8 digital inputs and outputs controlled via an I C interface. The TCA9534U features three address select pins that can be set to configure eight unique addresses meaning you can have up to 64 I/O pins controlled from a ...

along with several power rail pins to latch terminals and, as you would expect from a Qwiic board, the I C interface is broken out to a pair of Qwiic connectors. Controlling the TCA9534 is relatively straightforward but to make things even easier, we've written an Arduino Library and a Python Package for the Qwiic GPIO to make writing code for it as ...

options for each of those cable types: SparkFun Qwiic Shield for Thing Plus  DEV-16790 SparkFun Qwiic Shield for Arduino  DEV-14352 SparkFun Qwiic Adapter  DEV-14495 SparkFun Qwiic Shield for Arduino Nano  DEV-16789 Jumper Wires Standard 7" M/M - 30 AWG (30 Pack)  PRT-11026 Qwiic Cable - 100mm  PRT-14427 ...

We would also recommend taking a look at the following tutorials if you aren't familiar with the concepts covered in them: Hook-Up Wire - Assortment (Stranded, 22 AWG)  PRT-11375 Qwiic Cable - 200mm  PRT-14428 Polarity An introduction to polarity in electronic components. Discover what polarity is, which parts have it, and how to identify it. Se ...

to eight digital input/output pins via I C. In this section we'll examine the characteristics of the TCA9534 as well as the features of the Qwiic GPIO breakout. TCA9534 I/O Expander IC The TCA9534 from Texas Instruments provides an I C to parallel digital input output interface. We'll cover the basics here but for a thorough overvi ...

and you can also invert the polarity of each pin as well via I C. Read on to the Qwiic GPIO Arduino Library and Python package sections for more information on how to configure and interact with these pins. Qwiic and I C Interface As you have come to expect with Qwiic boards, the connections for the I C bus (SDA, SCL, GND and 3.3V) on the Qwiic GPI ...

This jumper ties the SDA and SCL lines to 3.3V via two 4.7kΩ resistors. The default state is closed. To disable the pull-up resistors, simply sever the traces in between the pads to open the jumper. If you have multiple Qwiic GPIO's or other I C devices on the same bus, disable all but one pair of pull-up resistors to avoid creating too strong of a resistance on the SDA and SCL lines. Power Jumper This jumper controls voltage to the power LED ...

microcontroller and attach some peripherals to the I/O pins. Next up we'll detail how to assemble the board and your Qwiic GPIO circuit. Hardware Assembly The Qwiic system makes connecting the Qwiic GPIO to your chosen microcontroller a breeze. All you need to do is connect your Qwiic GPIO to your chosen development board with a Qwiic cable or adapter c ...

With the Qwiic GPIO circuit assembled and connected to your microcontroller it's time to get some code uploaded and start controlling the extra I/O pins via I C! Qwiic GPIO Arduino Library Note: This library assumes you are using the latest version of the Arduino IDE on your desktop. If this is your first time using Arduino, please review our tutorial on in ...

LOW . bool digitalRead(uint8_t gpioNumber); - Standard Digital Read function. Returns the status of the selected GPIO pin. uint8_t digitalReadPort(bool *gpioInStatus); - Read the status of the entire port set up using a bool . Returns status of all selected pins on the port. Take a look at Example2B - Read_GPIO_Port for reference. Advanced Function ...

you want to control more pins, simply add another myGPIO.pinMode(); for whichever pin you want to use to set it as an output and then control it using myGPIO.digitalWrite(); . Example 1B: Write GPIO - Port This version of writing to the Qwiic GPIO controls the entire port (all eight GPIO pins). In order to set up the port we need to define the number ...

bool gpioState = myGPIO.digitalRead(0); switch (gpioState) { case true: Serial.println("HIGH"); break; case false: Serial.println("LOW"); break; } delay(250); } The example circuit pictured above demonstrates how to monitor an active HIGH input on the Qwiic GPIO by driving the selected I/O pin (in this case GPIO 0) LOW whenever the button is pressed. Note: Defining a pin as an input is not absolutely ne ...

//There are two ways to read from a port, either by returning the full register value as a uin t8_t, or passing in an array of 8 boolean's to be modified by the function with the statuses of each pin uint8_t portValue = myGPIO.digitalReadPort(gpioStatus); Serial.print("uint8_t: "); Serial.println(portValue, BIN); Serial.print("Bool array: "); for (uint8_t arrayPosition = 0; arrayPosition < NUM_GPIO; arrayPosition++) { Serial. ...

Example 3B, as you might expect by now, exhibits how to invert the entire port on the Qwiic GPIO. The code starts as the other port examples do by defining the number of pins and setting the pin mode of all pins on the port. It then inverts half of the pins' polarity using a second boolean. The setup can be seen below: #define NUM_GPIO 8 bool currentPinMode[NUM_GPIO] = {GPIO_IN, GPIO_IN, GPIO_IN, GPIO_IN, GPIO_IN, GPIO_IN, GPIO ...

Now that our interrupt pin is configured the code monitors the GPIO pins' statuses and any time the status changes, the interrupt pin on the Qwiic GPIO will be driven LOW. You can view the entire loop and ISR function below: void loop() { if (dataReady) { myGPIO.digitalReadPort(gpioStatus); for (uint8_t arr ...

single board computer. PyPi Installation This repository is hosted on PyPi as the sparkfun-qwiic-gpio package . On systems that support PyPi installation via pip3 (use pip for Python 2) is simple using the following commands: For all users (note: the user must have sudo privileges): sudo pip3 install sparkfun-qwiic-gpio For the curren ...

section we'll go over each example and highlight pertinent bits of code. To run the examples, download or copy the code into a file then open/save the example file (if needed) and execute the code in your preffered Python IDE. Qwiic GPIO Example 1 This example sets up all eight I/O pins as outputs and toggles them on and off each second. Note you ...

import qwiic_gpio import time import sys def runExample(): print("\nSparkFun Qwiic GPIO Example 1\n") myGPIO = qwiic_gpio.QwiicGPIO() if myGPIO.isConnected() == False: print("The Qwiic GPIO isn't connected to the system. Please check your connection", \ file=sys.stderr) return myGPIO.begin() myGPIO.mode_0 = myGPIO.GPIO_OUT myGPIO.mode_1 = myGPIO.GPIO_OUT myGPIO.mo ...

print("\nEnding Example 1") sys.exit(0) Qwiic GPIO Example 2 Example 2 shows how to read each I/O pin when they are configured as inputs. It first sets up all pins using the setMode function as we did in Example 1. The code then monitors and prints out the status of each input every 0.25 seconds. You can copy the entire example below or open it from your downloaded copy of t ...

import qwiic_gpio import time import sys def runExample(): print("\nSparkFun Qwiic GPIO Example 2\n") myGPIO = qwiic_gpio.QwiicGPIO() if myGPIO.isConnected() == False: print("The Qwiic GPIO isn't connected to the system. Please check your connection", file=sys.stderr) return myGPIO.begin() myGPIO.mode_0 = myGPIO.GPIO_IN myGPIO.mode_1 = myGPIO.GPIO_IN myGPIO.mode ...