added v3 work in Grandfatherclock.md and added my schizo thoughts on a pulsar clock in Pulsar-Clock.md

2026-03-28 03:52:30 -06:00
parent bfe4bde866
commit ebf39238e8
2 changed files with 426 additions and 0 deletions
@@ -0,0 +1,89 @@
+# Version 3:
+
+## To Figure Out
+
+1.  Details on the NEO-F10T/breakout
+    1.  Battery
+    2.  GPIO Pinouts
+    3.  Voltages
+    4.  GPIO pin pitch
+    5.  Antenna connector type
+    6.  Best GPS Antenna+Cable for it
+    7.  PPS Settings
+    8.  UART Speed settings
+    9.  Any pulse out (32kHz maybe?)
+2.  [Pulsar Clock](../../JoplinNotes/Backups/Pulsar%20Clock-1.md)
+    1.  all daaat shit lmao
+
+## Hardware
+
+1.  Raspberry Pi 5 16GB
+    
+    1.  Raspberry OS Lite
+2.  NVME hat for NVME boot (? IF NOT INTERFERE WITH GPIO SHIT)
+    
+    1.  NVME SSD (? IF NOT INTERFERE WITH GPIO SHIT)
+3.  **Custom Hat**
+    
+    1.  1.  [RTC](https://www.adafruit.com/product/3013#tutorials) x2
+            
+            1.  [CR1220](https://www.adafruit.com/products/380) x2 (Battery)
+        2.  Gen 10 Timekeeping Specific GPS Module - NEO-F10T
+            
+            1.  &nbsp;[Buy Varieties (Europe)](https://gnss.store/collections/neo-f10t-timing-gnss-modules)
+                
+                1.  Make sure battery TYPE and APPLICATION is figured out
+                    1.  May have to solder in holder or something
+                2.  Make sure GPIO pins are FUCKING 2.54mm AND 3.3v OR 5v
+                    1.  use goldddd ones~
+                3.  Make sure antenna connector is gonna work
+                    1.  GPS cable
+                    2.  GPS antenna
+            2.  [Product Summary](https://content.u-blox.com/sites/default/files/documents/NEO-F10T_ProductSummary_UBX-22025534.pdf)
+                
+            3.  [Data Sheet](https://content.u-blox.com/sites/default/files/documents/NEO-F10T_DataSheet_UBX-22022576.pdf)
+                
+            4.  [Hardware Integration Guide](https://content.u-blox.com/sites/default/files/documents/NEO-F10T_IntegrationManual_UBX-22018271.pdf)
+                
+            5.  [Chip Product Page](https://www.u-blox.com/en/product/neo-f10t-module)
+                
+
+## Operation Flow
+
+Both RTCs loaded time over I2C, both inputting 32kHz signal via GPIO
+
+Dual RTC time, GPS time, system time, GPS PPS, dual 32kHz signals, pulsar readings:
+
+- tested off each other
+    - deltas per pulse (errors) (add to Grafana)
+    - averages per pulse (add to Grafana)
+    - stored in histograms, constantly updating (add to Grafana)
+        - dial in desired confidence interval over time (add to Grafana)
+    - divisor/multiplier for 32kHz pulses to make them ONE BEAT constantly updated (displayed in Grafana)
+        - one 32kHz oscillator (the most reliable) will be dubbed the "master universal beat pulse", made into pulse by divisor/multiplier based on previous calculations
+        - and will serve as source of truth for UBT web display
+- sanity tested against network sources
+
+1.  Test both RTC times against GPS time
+    
+2.  Test system time against GPS time
+    
+3.  Test system time against network time
+    
+4.  Sanity Checks
+    
+    1.  Time reported vs time actual (net)
+    2.  Cable/system delay calculated vs delay measured
+    3.  Readability check
+    4.  Repeatability check
+    5.  Accuracy check
+    6.  Precision check
+
+## Maybe
+
+1.  Play with PPS (dial faster?)
+    
+2.  Play with UART speed (dial faster?)
+    
+
+&nbsp;