# PiicoDev\_SSD1306 and PicoW

**URL:** <https://forum.core-electronics.com.au/t/piicodev-ssd1306-and-picow/18539>\
**Category:** Support\
**Created:** [19 November 2023 03:37 UTC](https://forum.core-electronics.com.au/t/piicodev-ssd1306-and-picow/18539 "2023-11-19T03:37:30Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Josephine250981](https://avatars.discourse-cdn.com/v4/letter/j/7993a0/32.png) [@Josephine250981](https://forum.core-electronics.com.au/u/Josephine250981)\
**Post date:** [19 November 2023 03:37 UTC](https://forum.core-electronics.com.au/t/piicodev-ssd1306-and-picow/18539/1 "2023-11-19T03:37:30Z")

</div>

I have a PicoW attached to a PiicoDev board. When trying to attach the PiicoDev\_SSD1306 it is unable to be found on I2C. The following code shows this with the output

```python
from PiicoDev_SSD1306 import *
from PiicoDev_SSD1306 import PiicoDev_SSD1306
from machine import Pin,I2C
import ssd1306

def do_scan(which):
    i2c=I2C(which)
    print("I2C Configuration: "+str(i2c))
    devices = i2c.scan()
    for device in devices:
        print(hex(device))
            
do_scan(0)
do_scan(1)

```

### Output

```auto
>>> %Run -c $EDITOR_CONTENT

MPY: soft reboot
I2C Configuration: I2C(0, freq=399361, scl=9, sda=8)
I2C Configuration: I2C(1, freq=200000, scl=7, sda=6)

```

#### When the same code is run with the PiicoDev\_BME280 the output is as following

```auto
>>> %Run -c $EDITOR_CONTENT

MPY: soft reboot
I2C Configuration: I2C(0, freq=399361, scl=9, sda=8)
0x77
I2C Configuration: I2C(1, freq=200000, scl=7, sda=6)

```

The display has power indicator and was very briefly working. Any ideas?

---

<div class="post-metadata">

**Author:** ![Liam120347](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/liam120347/32/5003_2.png) [@Liam120347](https://forum.core-electronics.com.au/u/Liam120347)\
**Post date:** [19 November 2023 05:52 UTC](https://forum.core-electronics.com.au/t/piicodev-ssd1306-and-picow/18539/2 "2023-11-19T05:52:59Z")

</div>

Hi Josephine!!

Welcome to the forum

I would say that the connectors arent all the way in, the last little bit of the PiicoDev connection can be a bit rough.

Otherwise the FPC on the back might not have soldered correctly (which is rare but possible). If you have a moment could you please send through a photo of the back of the OLED module?