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added OLED to readme

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@ -37,6 +37,7 @@ bitaxe is a fully open source hardware Bitcoin ASIC miner. Ultra is the 3rd majo
- [BM1366 from NBTC on AliExpress](https://www.aliexpress.us/item/3256804709142138.html). I got the "AG" variant. Not really sure what the difference is.
- [40x40mm heatsink and 5V fan](https://www.aliexpress.com/item/2251832861666365.html) from a random AliExpress seller. At least half of these arrived broken in some way. But they are cheap and the working ones do keep the BM1387's nice and cool when used with some thermal compound.
- Swap this fan with the [Noctua NF-A4x10](https://noctua.at/en/products/fan/nf-a4x10-pwm) 5V 4-Pin fan for a much more pleasant experience.
- Supports 0.91" SSD1306-based I2C OLED Module. [Example Amazon seller](https://www.amazon.com/gp/product/B08ZY4YBHL)
- The BM1366 serial port is 1.8V. These pins are broken out, but the main idea is to communicate with the BM1366 from the ESP32
- Level shifters to interface the 1.8V BM1366 with the 3.3V ESP32. These pins are also broken out.
- [KiCad 7](https://www.kicad.org) design files