Support seting a different I2C address (different from the default 0x27) on character LCDs with PCF8574T (wokwi-lcd1602, wokwi-lcd2004)

[Gjorgjevikj]

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[urish]

If I understand correctly, the range of valid addresses is 0x20 to 0x27.

What's the use case for changing the address?

[Gjorgjevikj]

Connecting multiple displays to the same I2C bus. Probably not a most common scenario, but can be usable in certain projects. It does exist as an option on the hardware modules, anyway.

From: Uri Shaked @.> Sent: вторник, 16 август 2022 21:41 To: wokwi/wokwi-features @.> Cc: Dejan Gjorgjevikj @.>; Author @.> Subject: Re: [wokwi/wokwi-features] Support seting a different I2C address (different from the default 0x27) on character LCDs with PCF8574T (wokwi-lcd1602, wokwi-lcd2004) (Issue #404)

If I understand correctly, the range of valid addresses is 0x20 to 0x27.

What's the use case for changing the address?

— Reply to this email directly, view it on GitHub https://github.com/wokwi/wokwi-features/issues/404#issuecomment-1217084401 , or unsubscribe https://github.com/notifications/unsubscribe-auth/AD3EHKLIIU7CDEZAZMCVT7TVZPVE3ANCNFSM56WRPMPA . You are receiving this because you authored the thread. https://github.com/notifications/beacon/AD3EHKJ3H5RHFB7A66RK3GDVZPVE3A5CNFSM56WRPMPKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOJCFTX4I.gif Message ID: @. @.> >

[urish]

Apparently, it's already supported - use the "i2c-address" attribute to set the address, e.g.:

    {
      "type": "wokwi-lcd2004",
      "id": "lcd2",
      "top": 276.63,
      "left": -16.62,
      "attrs": { "pins": "i2c", "i2c-address": "0x20" }
    }

docs: https://docs.wokwi.com/parts/wokwi-lcd1602#attributes

[Gjorgjevikj]

Probably my bad. I did search for that but did not find it on

https://docs.wokwi.com/parts/wokwi-lcd1602#i2c-configuration

Thanks, anyway.

BTW,

although not so common, LCDs with the same Hitachi driver and same connections with different geometries also exist

8x1, 16x4, 24x2, 40x2, …

Probably it is not to hard to add some of them… just a thought...

From: Uri Shaked @.> Sent: вторник, 16 август 2022 22:16 To: wokwi/wokwi-features @.> Cc: Dejan Gjorgjevikj @.>; Author @.> Subject: Re: [wokwi/wokwi-features] Support seting a different I2C address (different from the default 0x27) on character LCDs with PCF8574T (wokwi-lcd1602, wokwi-lcd2004) (Issue #404)

Apparently, it's already supported - use the "i2c-address" attribute to set the address, e.g.:

{
  "type": "wokwi-lcd2004",
  "id": "lcd2",
  "top": 276.63,
  "left": -16.62,
  "attrs": { "pins": "i2c", "i2c-address": "0x20" }
}

docs: https://docs.wokwi.com/parts/wokwi-lcd1602#attributes

— Reply to this email directly, view it on GitHub https://github.com/wokwi/wokwi-features/issues/404#issuecomment-1217115458 , or unsubscribe https://github.com/notifications/unsubscribe-auth/AD3EHKJIUA3UKPUVJ7WA55TVZPZJ3ANCNFSM56WRPMPA . You are receiving this because you authored the thread. https://github.com/notifications/beacon/AD3EHKOOBGV66PKJVGJTMPTVZPZJ3A5CNFSM56WRPMPKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOJCF3KQQ.gif Message ID: @. @.> >

[urish]

Probably my bad. I did search for that but did not find it on https://docs.wokwi.com/parts/wokwi-lcd1602#i2c-configuration

Added a note there!