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Princess Pi
2025-10-14 00:39:07 -06:00
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huawaii-ub-8mt-breakout.md
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**Pins are 2mm pitch**
**3.3 Volts**
| Cable | Module Pin | Module Pin Meaning | Raspberry Pi 4 Pin | Voltage | Notes |
|:-------|:-----------|:-------------------------|:---------------------------|:------------------------|:----------------------------------------------------------|
| Red | 2 - VCC | Voltage In | 1 - 3.3 Volts Out | 3.3 V | NOT 5 V TOLERANT |
| Black | 8 - GND | Ground | 25 - Ground | 3.3 V? | UNKNOWN 3 V AND 5 V TOLERANCES |
| Yellow | 4 - RST | Hardware Reset | NC? - Not Connected/GPIO? | 3.3 V | NOT 5 V TOLERANT |
| White | 6 - TP1 | Time Pulse 1/PPS | 12 - GPIO 18 | 3.3 V | NOT 5 V TOLERANT |
| Purple | 7 - TP2 | Time Pulse 2/PPS | NC? - Not Connected/GPIO? | 3.3 V | NOT 5 V TOLERANT |
| Green | 5 - RXD | UART Receive | 8 - UART Transmit | 3.3 V | NOT 5 V TOLERANT |
| Grey | 3 - TXD | UART Transmi t | 10 - UART Receive | 3.3 V | NOT 5 V TOLERANT |
| Orange | 1 - VCC_ANT | Antenna Power Supply | NC? Regulated Power Supply | 5.0 V Max 100 mA | MUST USE REGULATED POWER SUPPLY AND UNKNOWN 3 V TOLERANCE |
|:-------|:-----------|:-------------------------|:---------------------------|:-----------------|:----------------------------------------------------------|
| Red | 2 - VCC | Voltage In | 1 - 3.3 Volts Out (Split) | 3.3 V | NOT 5 V TOLERANT |
| Black | 8 - GND | Ground | 25 - Ground | 3.3 V? | UNKNOWN 3 V AND 5 V TOLERANCES |
| Yellow | 4 - RST | Hardware Reset | NC? - Not Connected/GPIO? | 3.3 V | NOT 5 V TOLERANT |
| White | 6 - TP1 | Time Pulse 1/PPS | 12 - GPIO 18 | 3.3 V | NOT 5 V TOLERANT |
| Purple | 7 - TP2 | Time Pulse 2/PPS | NC? - Not Connected/GPIO? | 3.3 V | NOT 5 V TOLERANT |
| Green | 5 - RXD | UART Receive | 8 - UART Transmit | 3.3 V | NOT 5 V TOLERANT |
| Grey | 3 - TXD | UART Transmi t | 10 - UART Receive | 3.3 V | NOT 5 V TOLERANT |
| Orange | 1 - VCC_ANT | Antenna Power Supply | NC? Regulated Power Supply | 5.0 V Max 100 mA | MUST USE REGULATED POWER SUPPLY AND UNKNOWN 3 V TOLERANCE |
### Adafruit DS3231 Precision RTC Breakout
**Pins are 2.54mm pitch**