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Added support for Expansion Kit to Heltec V4 OLED repeaters#2326

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IoTThinks wants to merge 1 commit intomeshcore-dev:devfrom
IoTThinks:MCdev-Added-HeltecV4-Expansion-Kit-2026-04-16
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Added support for Expansion Kit to Heltec V4 OLED repeaters#2326
IoTThinks wants to merge 1 commit intomeshcore-dev:devfrom
IoTThinks:MCdev-Added-HeltecV4-Expansion-Kit-2026-04-16

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@IoTThinks
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This PR is to add support for Expansion Kit to Heltec V4 OLED repeaters.
https://heltec.org/project/wifi-lora-32-v4-expansion-housing/

This KIT uses I2C GPIOs 17/28 for OLED but uses I2C GPIOs 4,3 for sensors.
Tested working by a friend here.

@cwichura
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I am the one working with IoTThinks on this. I can confirm that the OLED variant of the V4 Expansion Kit I own now works correctly with both the OLED display and the I2C sensors detected.

@cwichura
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cwichura commented Apr 18, 2026

Relates to #2277

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