For any past or future winners of our Raspberry Pi Zero 2 W boards as
door prizes, or anyone else who's bought one, here's the bundle deal I
got on Amazon last year (that I mentioned to some of you at yesterday's
meeting)...
https://www.amazon.ca/iRasptek-Raspberry-Zero-Essential-Accessories/dp/B0BY…
It's unfortunately marked as "Currently unavailable", and I don't know
if it will come back or not. There are other bundle deals out there if
you search, but I haven't seen anything as low as what I paid ($17 +
taxes) with that many accessory cables/adapters included.
Gilbert
--
Gilbert E. Detillieux E-mail: <gedetil(a)muug.ca>
Manitoba UNIX User Group Web: http://muug.ca/
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Thanks, Wyatt, for a great presentation last night! It provided a great
overview and demo of monitoring I2C sensors on a Raspberry Pi, via GPIO
pins. You mentioned that some of the sensors visible to
libsensors/lm-sensors are made available to net-snmp via particular MIB
OID's, but not all of them.
If you want to monitor any sensors that aren't directly available in
net-snmp (e.g. in LibreNMS), there is a way around that, using
net-snmp's "extend" mechanism, and a helper script, such as this one...
https://docs.librenms.org/Extensions/Applications/Raspberry%20Pi%20GPIO%20M…
You would download the rpigpiomonitor.php file as recommended, as well
as the provided sample rpigpiomonitor.ini file, which you would then
edit as needed for your particular sensor(s). For example, this is my
INI file for monitoring temperature and humidity from a DHT22/AM2302
sensor (not I2C based, but there is a kernel dtoverlay module for it):
; Example configuration which reads a temperature sensor
[sensortemp]
type = temperature
description = AM2302 Room Temperature
lowlimit = 0
lowwarnlimit = 15
warnlimit = 32
highlimit = 40
external_gpio_reader = /etc/snmp/Get_DHT_fp_temp.sh
; Example configuration which reads a humidity sensor
[sensorhum]
type = humidity
description = AM2302 Relative Humidity
lowlimit = 0
lowwarnlimit = 4
warnlimit = 65
highlimit = 90
external_gpio_reader = /etc/snmp/Get_DHT_fp_hum.sh
The "external_gpio_reader" variable is set to a program or script file
(it has to be a file, as the PHP code tests to see if the file exists
before trying to run it) which would provide a single numerical value as
output, corresponding to a specific sensor. Since you can't pass
arguments to the program/script, you would typically need a separate
wrapper script for each sensor. (Of course, you can use multiple links
to the same script, and use the script name as an implicit argument to
the shared script.)
Hope this helps!
Gilbert
--
Gilbert E. Detillieux E-mail: <gedetil(a)muug.ca>
Manitoba UNIX User Group Web: http://muug.ca/
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