If you look on the back of the sensor there are only 3 wires used. VCC, GND, and a SIG. The NC pin is “Not Connected”
Wire the GND -> Arduino ground VCC -> Arduino 3.3V (Looks like it may also accept 5V) SIG -> A5 (Analog 5)
Code to read O2 Sensor
Copy and paste the following code into the Arduino IDE
// Grove - Gas Sensor(O2) test code
// Note:
// 1. It need about about 5-10 minutes to preheat the sensor
// 2. modify VRefer if needed
const float VRefer = 3.3; // voltage of adc reference
const int pinAdc = A5;
void setup()
{
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println("Grove - Gas Sensor Test Code...");
}
void loop()
{
// put your main code here, to run repeatedly:
float Vout =0;
Serial.print("Vout =");
Vout = readO2Vout();
Serial.print(Vout);
Serial.print(" V, Concentration of O2 is ");
Serial.println(readConcentration());
delay(500);
}
float readO2Vout()
{
long sum = 0;
for(int i=0; i<32; i++)
{
sum += analogRead(pinAdc);
}
sum >>= 5;
float MeasuredVout = sum * (VRefer / 1023.0);
return MeasuredVout;
}
float readConcentration()
{
// Vout samples are with reference to 3.3V
float MeasuredVout = readO2Vout();
//float Concentration = FmultiMap(MeasuredVout, VoutArray,O2ConArray, 6);
//when its output voltage is 2.0V,
float Concentration = MeasuredVout * 0.21 / 2.0;
float Concentration_Percentage=Concentration*100;
return Concentration_Percentage;
}
Upload and Launch the Serial Monitor Tools -> Serial Monitor or Ctrl + Shift + M
Need to Specify the serial input Start the serial connection Print input to log
// Set analog pin variable
const int aPin = A0;
void setup() {
// Start Serial connection
Serial.begin(9600);
}
void loop() {
// Print analog input to Serial Monitor
Serial.println(analogRead(aPin));
}
SSH into the UniFi. Note that the UniFi username and password get updated from the controller. Refer to here to find username and password.
ssh ubnt@192.168.1.20
run the syswrapper.sh script with the restore-default option.
syswrapper.sh restore-default & set-default &
Note that this changed. Used to, you could just run syswrapper.sh restore-default and it would reset. Now if you do that, it won’t reset, you’ll be able to ping the device, but you can’t ssh into it meaning you will need to physically reboot it.
Once the device is reset, log in over ssh and reconfigure.
Note that the username and password will now be ubnt/ubnt
larry@localhost:~$ sudo tail -f /home/unms/data/logs/unms.b5a3713b02f71e06fb3a84a3a9a75c558.log
{"msg":"setting permissions on /home/app/unms/data/control","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"Linking /home/app/unms/public/site-images -> /home/app/unms/data/images","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"Linking /home/app/unms/public/firmwares -> /home/app/unms/data/firmwares","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"Stepping down from root: su-exec \"/usr/local/bin/docker-entrypoint.sh\" \"index.js\"","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"Running docker-entrypoint index.js","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"Version: 1.1.6+e6ec4747d.2020-03-13T10:52:14+01:00","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"Waiting for database containers","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"psql: fe_sendauth: no password supplied","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
{"msg":"nc: bad address 'unms-redis'","name":"unknown","hostname":"unknown","pid":0,"v":0,"level":30,"tag":"unms","time":"2020-04-17T16:28:35+00:00"}
Stop UNMS
sudo ~unms/app/unms-cli stop
Start UNMS
sudo ~unms/app/unms-cli start
Fix Redis AOF
sudo ~unms/app/unms-cli fix-redis-aof
Running the above command resolved the problem and let UNMS start working.
larry@localhost:~$ sudo ~unms/app/unms-cli stop
larry@localhost:~$ sudo ~unms/app/unms-cli fix-redis-aof
Creating network "unms_internal" with the default driver
Creating network "unms_public" with the default driver
Creating unms-fluentd
The AOF appears to start with an RDB preamble.
Checking the RDB preamble to start:
[offset 0] Checking RDB file --fix
[offset 26] AUX FIELD redis-ver = '5.0.5'
[offset 40] AUX FIELD redis-bits = '64'
[offset 52] AUX FIELD ctime = '1587130996'
[offset 67] AUX FIELD used-mem = '276217328'
[offset 83] AUX FIELD aof-preamble = '1'
[offset 85] Selecting DB ID 0
[offset 80304063] Checksum OK
[offset 80304063] \o/ RDB looks OK! \o/
[info] 3307 keys read
[info] 0 expires
[info] 0 already expired
RDB preamble is OK, proceeding with AOF tail…
0x 79b7264: Expected prefix '*', got: '
AOF analyzed: size=127631360, ok_up_to=127627876, diff=3484
This will shrink the AOF from 127631360 bytes, with 3484 bytes, to 127627876 bytes
Continue? [y/N]: Successfully truncated AOF
larry@localhost:~$ sudo ~unms/app/unms-cli start
On the forums they seemed to recommend stopping the service and running
sudo ~unms/app/unms-cli rewrite-redis-aof
I was getting the following error when trying to run this command. Running the above command worked though.
larry@localhost:~$ sudo ~unms/app/unms-cli stop
larry@localhost:~$ sudo redis-check-aof --fix ~unms/data/redis/appendonly.aof
The AOF appears to start with an RDB preamble.
Checking the RDB preamble to start:
[offset 0] Checking RDB file --fix
--- RDB ERROR DETECTED ---
[offset 9] Can't handle RDB format version 9
[additional info] While doing: start
[additional info] Reading type 0 (string)
[info] 0 keys read
[info] 0 expires
[info] 0 already expired
RDB preamble of AOF file is not sane, aborting.
larry@localhost:~$
nvram_
nvram_get nvram_set
nvram_get
Usage:
nvram_get [] []
command:
rt2860_nvram_show - display rt2860 values in nvram
rtdev_nvram_show - display 2nd ralink device values in nvram
show - display values in nvram for
gen - generate config file from nvram for
renew - replace nvram values for with
clear - clear all entries in nvram for
platform:
2860 - rt2860
rtdev - 2nd ralink device
file:
- file name for renew command
nvram_get show
2860
nvram_get show 2860
You should be able to copy and paste the following in a backup.sh file and then execute from cron. Should work out of the box, but you can change the backup directory and the teams.sh path if needed/wanted.
#!/bin/bash
# LibreNMS backup script
# Jan 1, 2019
lDate=`date +%Y%m%d-%H%M` # local date + hour minute
dDate=`date +%Y%m%d` # todays date
# If you have the teams.sh script, you can trigger a backup notification
ALERT="/home/admin/teams.sh -b"
# Directory to backup to
bDir="/backup"
bName="librenms_backup"
# MySQL settings for tar and sqldump
sqlDir="/var/lib/mysql"
sqlDB="librenms"
sqlUN="root"
sqlPW=""
LOG="${bDir}/${lDate}-${bName}.log"
# Directory that contains data
dDir="/opt/librenms"
# tar LibreNMS dir
# tar SQL dir "the whole thing with the innode files
# sql dump of the db for extra redundancy
if [ -d ${bDir} ]; then
echo "backup dir exist, starting to backup"
else
echo "backup dir not available. Quiting"
exit 1
fi
${ALERT} "Starting backup for ${bName} - `date`"
systemctl stop mariadb httpd
# LibreNMS data backup
tar -zcvf ${bDir}/${lDate}-${bName}.tgz ${dDir}
if [ $? -eq 0 ]; then
echo "Tar succesfully backed up ${bDir}"
else
echo "Tar failed while trying to backup ${dDir}"
echo " ${lDate} - Tar failed while trying to backup ${dDir}" >> ${LOG}
${ALERT} "${lDate} - Tar failed while trying to backup ${dDir}"
fi
# MySQL data backup
tar -zcvf ${bDir}/${lDate}-${bName}-mysql.tgz ${sqlDir}
if [ $? -eq 0 ]; then
echo "Tar succesfully backed up ${sqlDir}"
else
echo "Tar failed while trying to backup ${sqlDir}"
echo " ${lDate} - Tar failed while trying to backup ${sqlDir}" >> ${LOG}
${ALERT} "${lDate} - Tar failed while trying to backup ${sqlDir}"
fi
systemctl start mariadb httpd
sleep 5
# SQL dump
mysqldump -u ${sqlUN} -p'4rfvBHU8!' ${sqlDB} > ${bDir}/${lDate}-${bName}.sql
if [ $? -eq 0 ]; then
echo "MySQL DB dumped"
else
echo "Ran into error while doing sql dump"
echo "${lDate} - Ran into error while doing sql dump" >> ${LOG}
${ALERT} "${lDate} - Ran into error while doing sql dump"
fi
echo "Removing old backups"
if ( ls ${bDir} | grep -q ${dDate} );then
find ${bDir}/* -prune -mtime +31 -exec rm {} \;
else
echo "Looks like there are no backup files! Aborting!!!"
${ALERT} "${lDate} - Error: find failed to find any backup files in backup dir. Aborting!!!"
fi
${ALERT} "Finished backup for ${bName} - `date`"
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