Chubbard: Created page with "== General notes on some of my Pis == Prep work for power monitoring using lechacal Hats....

 Run the raspi-config tool $ sudo raspi-config  Then disable the login uart 3 Interface Options     <<-- Use option 5 Interfacing Options instead if using the image before 12 DEC 2020 P6 Serial Would you like a login shell to be accessible over serial? Select No to the login shell question. Would you like the serial port hardware to be enabled? Select Yes to the serial port..."

2023-09-18T01:13:32Z

Created page with "== General notes on some of my Pis == Prep work for power monitoring using lechacal Hats.... <pre> Run the raspi-config tool $ sudo raspi-config Then disable the login uart 3 Interface Options <<-- Use option 5 Interfacing Options instead if using the image before 12 DEC 2020 P6 Serial Would you like a login shell to be accessible over serial? Select No to the login shell question. Would you like the serial port hardware to be enabled? Select Yes to the serial port..."

New page

== General notes on some of my Pis ==
Prep work for power monitoring using lechacal Hats....
<pre>
Run the raspi-config tool
$ sudo raspi-config

Then disable the login uart
3 Interface Options <<-- Use option 5 Interfacing Options instead if using the image before 12 DEC 2020
P6 Serial
Would you like a login shell to be accessible over serial?
Select No to the login shell question.
Would you like the serial port hardware to be enabled?
Select Yes to the serial port hardware to be enabled question.

Select Ok at the summary.

Back at the menu select finish.

Would you like to reboot now?
Select No to the reboot question (we will do that later).

sudo nano /boot/config.txt

At the end of the file add the following line:

dtoverlay=disable-bt

sudo systemctl disable hciuart

sudo reboot & exit

</pre>
Testing that it works
<pre>
chubbard@power01:~$ cat /dev/ttyAMA0
11 1129.3 62.6 206.0 79.3 2583.9 986.6 246.9 92.4
11 1142.2 60.3 207.3 78.5 2576.7 1028.9 244.9 91.0
11 1134.1 66.0 208.5 75.3 2595.9 1014.4 244.8 90.8
11 1134.4 62.8 206.0 76.7 2566.3 987.1 248.9 91.8
^C
</pre>
Script currently in use:
<pre>
#!/bin/bash
# Output from serial port:
# 11 125.7 54.2 51.2 54.5 260.2 58.8 1447.0 53.0

getdata() {
stty -F /dev/ttyAMA0 raw speed 38400 >/dev/null
read ID < /dev/ttyAMA0
echo "${ID}"

# Create array of values:
IFS=$' \r' read -r -a PROBES <<< "${ID}"
unset IFS
}

pushgraphite() {
local G_HOST="192.168.15.193"
local G_PORT=2003

# This is fast so only get the date once
local DAT=$(date +%s --utc)

# Iterate over array of values
for element in "${!PROBES[@]}"; do

# Suppress the noise floor on the 100A RPICT8 (~59w or so)
if [[ $( echo "${PROBES[element]} >= 71.9" | bc) -ne 1 ]];then
VALUE=0.0
else
VALUE="${PROBES[element]}"
fi

# 0 element is actually the ID of the hat, NOT a valid value
if [[ ${element} -eq 0 ]]; then
JUNK=0
else
# Send data to Graphite
if [[ ${UDP} = 'true' ]];then
echo " monitor.power.probe${element} ${VALUE} ${DAT}" | nc -u -q 1 -C ${G_HOST} ${G_PORT}
echo "Sent: monitor.power.probe${element} REAL: ${PROBES[element]} SENT: ${VALUE} ${DAT} | nc -u -q 1 -C ${G_HOST} ${G_PORT}"
else
echo " monitor.power.probe${element} ${VALUE} ${DAT}" | nc -N -C ${G_HOST} ${G_PORT}
echo "Sent: monitor.power.probe${element} REAL: ${PROBES[element]} SENT: ${VALUE} ${DAT} | nc -N -C ${G_HOST} ${G_PORT}"
fi
fi
done
}

#-------------------------------------------------------------------------------
# Set our defaults
#-------------------------------------------------------------------------------
UDP='false'

# Get any command args for the script
while getopts "hxU" OPTION
do
case ${OPTION} in
h) usage; exit 0 ;;
x) export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'; set -x ;;
U) UDP="true" ;;
*) echo "Status WARNING - Unexpected argument given $@"; exit 1 ;;
esac
done

RES='none'
while [ "${RES}" != 'good' ]; do
getdata
# https://www.cyberciti.biz/faq/finding-bash-shell-array-length-elements/
if [[ ${#PROBES[@]} -ne 9 ]] ; then
echo "PROBE count ${#PROBES[@]} serial bug detected."
RES='bad'
sleep 5
else
# echo "PROBE count ${#PROBES[@]}"
RES='good'
fi
done

pushgraphite

exit 0
</pre>

[[Category:Raspberry]]

Raspbery pi - Revision history