APU2 NTP server
I bought an apu2c0. I believe it will make a better NTP server than my other NTP servers.
More issues
RK3328 based NTP server
I got a ROC-RK3328-CC [https://libre.computer/products/boards/roc-rk3328-cc/]
SBC because it has true gigabit ethernet, emmc, and USB3. These are all better
I/O options than the latest Raspberry Pi 3 B+.
I put a SATA hard drive in a USB3 adapter and connected it. The SBC froze
TL-MR3020 NTP server, part 2
Part 1 [https://blog.dan.drown.org/mr3020-ntp-server/] was about the hardware, now for the
software
Step 1: pps-gpio-poll package
This architecture doesn't support device tree yet, so it has a special pps
driver. The repo for the driver package is at
https://github.com/mlichvar/openwrt-pps-gpio-poll
I
TL-MR3020 NTP server
I have a small travel router that I no longer use, and I wanted to turn it into
a NTP server.
The hardware is pretty well documented here:
https://openwrt.org/toh/tp-link/tl-mr3020
For the PPS signal input into the router, I need a GPIO
[https://en.wikipedia.org/
Sharp Wireless Weather Station, part 4
part 1 [https://blog.dan.drown.org/sharp-wireless-weather-station/], part 2
[https://blog.dan.drown.org/sharp-wireless-weather-station-2/], part 3
[https://blog.dan.drown.org/sharp-wireless-weather-station-3/]
Turn the receiver off between messages
To save power and cpu, I wanted to turn the RTL-SDR off between messages.
Because the next message comes at
GPS module measurements, part 3
GPS module comparison: NEO-7N vs NEO-M8N
Sharp Wireless Weather Station, part 3
part 1 [https://blog.dan.drown.org/sharp-wireless-weather-station/], part 2
[https://blog.dan.drown.org/sharp-wireless-weather-station-2/], part 4
[https://blog.dan.drown.org/sharp-wireless-weather-station-part-4/]
Reverse engineering the CRC
In looking at the crc field, I tried a number of different things.
rtl_433 crc functions
First, I tried the crc7,
Sharp Wireless Weather Station, part 2
part 1 [https://blog.dan.drown.org/sharp-wireless-weather-station/], part 3
[https://blog.dan.drown.org/sharp-wireless-weather-station-3/], part 4
[https://blog.dan.drown.org/sharp-wireless-weather-station-part-4/]
rtl_433
The rtl_433 [https://github.com/merbanan/rtl_433] project has support for
decoding a bunch of different weather station devices. Unfortunately, it doesn&
Sharp Wireless Weather Station, part 1
What is the goal?
I have a weather station with a wireless temperature/humidity sensor. Instead of
looking at the LCD on the wall, I'd like to have that data on my phone. A graph
of historical data would be nice as well.
What am I starting with?
GPS module measurements, part 2
After the previous tests [https://blog.dan.drown.org/gps-module-measurements/], I ordered
another GPS antenna to improve the signal conditions.
They're just the cheap puck style antennas with SMA connectors ($10 on Amazon),
and I've put them on my windowsill.
There's something wrong with