Precision-Timekeeping-Fuckery/Notes.md

Notes

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)