Neo Trellis not detected using I2C_address_detect

[Salchicha]

I've just got a 8x8 Neo Trellis and soldered 2 out of the 4 boards together and then tested it using the i2c_address_detect script and its not detecting it:

I2C address detection test
Did not find device at 0x10

I have it connected to the Teensy 4.1 as follows:

SDA > 18
SCL > 19
GND > GND
VIN > 3.3V
INT > not connected as using the onboard connector

I've soldered the A0 pad together on the 2nd board but as far as I understand it it should be detecting the 1st board regardless of any dodgy soldering or address mistakes on the 2nd board.

#include <Adafruit_I2CDevice.h>

Adafruit_I2CDevice i2c_dev = Adafruit_I2CDevice(0x10);

void setup() {
  while (!Serial) { delay(10); }
  Serial.begin(115200);
  Serial.println("I2C address detection test");

  if (!i2c_dev.begin()) {
    Serial.print("Did not find device at 0x");
    Serial.println(i2c_dev.address(), HEX);
    while (1);
  }
  Serial.print("Device found on address 0x");
  Serial.println(i2c_dev.address(), HEX);
}

void loop() {
  
}

 

[BriComp]

The SDA lines may need to have pull up resistors added.

 

[MatrixRat]

Double check solder bridge on address select pads, the pic is unclear.

Try inserting 150R in SCL and SDA lines as close as possible to T4.1 SCL and SDA pins.

 

[Salchicha]

Its working now without me having to change anything, the i2c_address_detect script still doesn't detect it but when I loaded up the NeoTrellis example it lit up like a christmas tree, maybe something in the sketch needs to activate it.