DEV-17047 - how can I run two of these in my Arduino code?

Qwiic System
1

Hi

Im struggling to get a second Qwiic GPIO DEV-17047 board working.

I’ve addressed the 2nd board as 0x26. could someone please help how I setup the boards together

do the boards and the addresses need defining?

if so what is the correct way to achieve this?

thanks in advance

nick

2

Hi nick.

We don’t have any code examples for using more than one board at a time but the [hookup guide has the information on how to [change addresses and how to [start a board on a different address in it.](https://learn.sparkfun.com/tutorials/sparkfun-qwiic-gpio-hookup-guide#qwiic-gpio-arduino-library)](https://learn.sparkfun.com/tutorials/sparkfun-qwiic-gpio-hookup-guide#hardware-overview)](https://learn.sparkfun.com/tutorials/sparkfun-qwiic-gpio-hookup-guide)

3

do the two boards need defining?

4

Yes you’d need to define both, so that your code can tell them apart. :slight_smile:

5

can you throw a bone then? how is done?

6

I’m afraid we can’t help with code but if any other forum users would like to chip in they are free to do so.

7

I believe what you want to do is something like the following:

TCA9534 myGPIO1;
TCA9534 myGPIO2;

void setup() {
  ...
  if (myGPIO1.begin() == false) { // default address 0x27
    Serial.println("Check Connections.  No Qwiic GPIO #1 detected.");
    while (1);
  }
  if (myGPIO2.begin(Wire, 0x26) == false) {
    Serial.println("Check Connections. No Qwiic GPIO #2 detected.");
    while (1);
  }
  ...
}

And then to use, do something like

myGPIO1.digitalWrite(0, HIGH);  // GPIO 0 on 1st DEV-17047
myGPIO1.digitalWrite(1, HIGH);  // GPIO 1 on 1st DEV-17047
...
myGPIO2.digitalWrite(0, HIGH);  // GPIO 0 on 2nd DEV-17047
8

Hi

Would there still need a #define ‘address’? like below with ‘sgp30’ & ‘Qwiic relay’. there isn’t one in the sparkfun library

#define SGP30_ADDR 0x58

#define RELAY_ADDR 0x6D, 0x6C

TCA9534 myGPIOA, myGPIOB;

SGP30 mySensor;

Qwiic_Relay quadRelayA(0x6D), quadRelayB(0x6C);

regards

Nick

9

In your code fragment, neither of your defines are being used (and RELAY_ADDR as you have it is probably not what you intended). But you could do so like this.

#define RELAY_ADDR_A 0x6D
#define RELAY_ADDR_B 0x6C
...
Qwiic_Relay quadRelayA(RELAY_ADDR_A), quadRelayB(RELAY_ADDR_B);

For the code I posed the other day, you could replace the 0x26 in the one myGPIO2.begin() with a define. That is up to you. It is generally considered good practice to do so. You could also add a define for the myGPIO1.begin() as well and also add it as (well as the Wire argument) in the call. i.e.

#define GPIO1_ADDR 0x27 // I think that was the default
#define GPIO1_ADDR 0x26
...
   if (myGPIO1.begin(Wire, GPIO1_ADDR) == false) {
...
   if (myGPIO2.begin(Wire, GPIO2_ADDR) == false) {
...
10

Gpio’s working great. Could you please check to see if i have the relays right?

#define RELAY_ADDR 0x6D

#define RELAY_ADDR_B 0x6C

Qwiic_Relay quadRelay(RELAY_ADDR), quadRelayB(RELAY_ADDR_B);

void setup() {

// Let’s make sure the hardware is set up correctly.

if(!quadRelay.begin() == false) { //if(!quadRelayA.begin())

Serial.println(“Check connections to Qwiic Relay A.”);}

else{

Serial.println(“Relay A Detected”);

}

if(!quadRelayB.begin() == false) { //if(!quadRelayB.begin())

Serial.println(“Check connections to Qwiic Relay B.”);}

else{

Serial.println(“Relay B Detected”);

}

}

11

Looks like your conditionals are wrong. Either remove the ‘!’ or the ’ == false’. i.e. do something like

if (quadRelay.begin() == false) {
    // error handling
}

or

if (!quadRelay.begin()) {
    // error handling
}