PrincessPi/Precision-Timekeeping-Fuckery
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Princess Pi
2025-10-29 19:24:57 -06:00
parent 658a572769
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Notes.md
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## Cable Delay
gps cable delay : RG-85 : 0.051 ns/cm
10ft in cm: 304.8
gps cable delay: 304.8*0.051 = 15.5448ns, round up to 16ns
## pins running
### GPS
#### gps WORKING
yellow - 3.3v - pi physical #17 (3.3)
black - gnd - pi physical #6 (gnd)
white - pps - pi Physical #12 (gpio 18)
blue - rx (module) to tx (pi) pi physical #8 (tx)
green - tx (module) to rx (pi) pi physical #10 (rx)
baud 9600
### RTC
#### i2c rtc WORKING!
red - 3.3v - pi physical #1 (3.3)
black - gnd - pi physical #9 (gnd)
brown - scl - pi physical #5 (i2c clock)
green - sda - pi physical #3 (i2c data)
gps cable delay: 304.8*0.051 = 15.5448ns, round up to 16ns
old/Pins.md
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## U-BLOX LEA-M8T-0-10 HUAWEI GPS Module
**Pins are 2mm pitch**
| Cable | Module Pin | Module Pin Meaning | Pi Pin (Physical) | Pi Pin (Name) | Voltage | Notes |
|:---------------|:-----------|:-------------------|:------------------|:------------------|:--------|:-------------------------------|
| Yellow | 2 | Module Voltage In | 17 | 3.3 Volts | 3.3 V | NOT 5 V TOLERANT |
| Yellow (Mark) | 1 | Antenna Voltage In | 2 | 5 Volts | 5 V | 5 V ONLY |
| Black | 8 | Ground | 6 | GND | 3.3 V? | UNKNOWN 3 V AND 5 V TOLERANCES |
| White | 6 | Time Pulse 1/PPS | 12 | GPIO 18 | 3.3 V | NOT 5 V TOLERANT |
| Blue | 5 | UART RX | 8 | UART TX / GPIO 14 | 3.3 V | NOT 5 V TOLERANT |
| Green | 3 | UART TX | 10 | UARD RX / GPUI 15 | 3.3 V | NOT 5 V TOLERANT |
|:----------------------|:-----------|:-------------------|:------------------|:------------------|:--------|:-------------------------------|
| Yellow | 2 | Module Voltage In | 17 | 3.3 Volts | 3.3 V | NOT 5 V TOLERANT |
| Yellow (Mark)->Orange | 1 | Antenna Voltage In | 2 | 5 Volts | 5 V | 5 V ONLY |
| Black | 8 | Ground | 6 | GND | 3.3 V? | UNKNOWN 3 V AND 5 V TOLERANCES |
| White | 6 | Time Pulse 1/PPS | 12 | GPIO 18 | 3.3 V | NOT 5 V TOLERANT |
| Blue | 5 | UART RX | 8 | UART TX / GPIO 14 | 3.3 V | NOT 5 V TOLERANT |
| Green | 3 | UART TX | 10 | UARD RX / GPUI 15 | 3.3 V | NOT 5 V TOLERANT |
## Adafruit DS3231 Precision RTC Breakout
**Pins are 2.54mm pitch**
| Cable | Module Pin (Physical) | Module Pin (Name) | Pi Pin (Physical) | Pi Pin (Name) | Voltage | Notes |