Acceleration data logger with usb storage, it uses GPS to precisely timestamp samples
Enable Serial port and I2C interface with sudo raspi-config
Enable GPS communication Enable NTP to use the GPS as clock source
sudo su
apt install gpsd
apt install ntpEdit configuration files as shown in the videos
#/etc/default/gpsd
START_DAEMON="true"
USBAUTO="true"
DEVICES="/dev/ttyS0"
GPSD_OPTIONS="-n -D 1"
ENABLED="yes"
GPS_BAUD=9600#/etc/ntpsec/ntp.conf
server 127.127.28.0 minpoll 3 maxpoll 3
fudge 127.127.28.0 refid GPS
pool 0.debian.poool.ntp.org iburstRestart and enable services if necessary
systemctl restart gpsd
systemctl restart ntp
systemctl enable gpsdCheck if the time is accurate with this command
watch -n 1 ntpq -pThe response should be similar to this, and the asterisk should point to the first gps source
remote refid st t when poll reach delay offset jitter
=================================================================================================
*SHM(0) .GPS. 0 l - 8 377 0.0000 -51.7218 5.6308
0.debian.pool.ntp.org .POOL. 16 p - 256 0 0.0000 0.0000 0.0010
+a.ntp.br 200.160.7.186 2 u 55 64 377 147.9015 71.1353 39.2378
+a.st1.ntp.br .ONBR. 1 u 5 64 377 124.0965 68.8115 42.7891Useful commands
cgps -s
Resources: PPS enabled us accuracy https://www.youtube.com/watch?v=7aTZ66ZL6Dk
No pps ms accuracy https://www.youtube.com/watch?v=NFSogtVp0Xo
curl -fsSL https://packages.redis.io/gpg | sudo gpg --dearmor -o /usr/share/keyrings/redis-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/redis-archive-keyring.gpg] https://packages.redis.io/deb $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/redis.list
sudo apt-get update
sudo apt-get install redis