I was having difficulty using the Cacti templates for the Enviromux Mini. Values for the temp and humidity probes were returning a maximum value of 65535 which can also occur if the sensor isn’t connected. We have several of these devices and they are nice monitoring solutions. I had to make a few changes to the SNMP OID values. I used this page as reference:
For things to work in Cacti I needed to add a trailing zero to each value.
Humidity Sensor 1 .188.8.131.52.4.1.36184.108.40.206.220.127.116.11
Temp Sensor 1 .18.104.22.168.4.1.3622.214.171.124.126.96.36.199
Grab the templates from here and import them into Cacti
Modify the temperate and humidity templates as follows by changing the OID values.
ENVIROMUX – Humidity
Now add your devices, then Data Sources, and finally add new graphs. This should work for later firmware versions of the Enviromux Mini. I happen to be using firmware 1.41.