I am trying to analyse an extremely intermittent fault on my Boilermate 2000 central heating system. It basically uses a micro-controller to control the pumps and receives input from 3 temperature sensors. I suspect one of the temperature sensors is faulty but very intermittent.
I have determined the temperature sensors are DS18S20 devices. Although they are actually encapsulated in a brass housing, they do respond to a readtemp12 command and provide the correct temperature when decoded.
There is one temperature sensor per pin on the CH controller (i.e. not multidrop one wire). Unfortunately I do not know the controller type, other than it is 40 pin.
What I would like to do is monitor the temperature sensor responses whilst in the live circuit. So the CH controller will be working as normal requesting temperatures from the DS18S20s and my AXE110 data-logger would eavesdrop on the conversation and record the data coming back from the sensor. I could then analyse this over time to find which if any sensors are giving bad data.
Does anyone have views if this is possible?
Malcolm
I have determined the temperature sensors are DS18S20 devices. Although they are actually encapsulated in a brass housing, they do respond to a readtemp12 command and provide the correct temperature when decoded.
There is one temperature sensor per pin on the CH controller (i.e. not multidrop one wire). Unfortunately I do not know the controller type, other than it is 40 pin.
What I would like to do is monitor the temperature sensor responses whilst in the live circuit. So the CH controller will be working as normal requesting temperatures from the DS18S20s and my AXE110 data-logger would eavesdrop on the conversation and record the data coming back from the sensor. I could then analyse this over time to find which if any sensors are giving bad data.
Does anyone have views if this is possible?
Malcolm