question

Having done the research and sorted this out I am posting my own answer for others.

This is has been tested on Rpi3B+ with Venus OS 2.42.

The steps for getting the Raspberry pi analogue inputs are documented in the following posts.

https://community.victronenergy.com/questions/40130/where-do-i-find-dbus-adc-files-for-raspberry-pi-in.html

and

https://community.victronenergy.com/articles/38710/victron-raspi-hat.html

Once these steps are complete and the analogue inputs are working with Venus OS it appears the raw data for all 8 inputs is available in the /sys/bus/iio devices like this.

root@raspberrypi2:# cd /sys/bus/iio/devices/iio\:device0/

root@raspberrypi2:/sys/bus/iio/devices/iio:device0# ls

dev in_voltage2-voltage3_raw in_voltage5-voltage4_raw in_voltage_scale

in_voltage-voltage_scale in_voltage2_raw in_voltage5_raw name

in_voltage0-voltage1_raw in_voltage3-voltage2_raw in_voltage6-voltage7_raw of_node

in_voltage0_raw in_voltage3_raw in_voltage6_raw power

in_voltage1-voltage0_raw in_voltage4-voltage5_raw in_voltage7-voltage6_raw subsystem

in_voltage1_raw in_voltage4_raw in_voltage7_raw uevent

The value on any interface can be read directly from the device psuedo files like this:

root@raspberrypi2:/sys/bus/iio/devices/iio:device0# cat in_voltage5_raw

3197

You may find reference to a script read_adc.sh in other threads, this script needs to be created on the Venus OS Rpi. Probably best to put it in a test directory on the /data partition.

root@raspberrypi2:/data/test# nano read_adc.sh

enter the following text:

for i in 0 1 2 3 4 5 6 7; do

echo -n "ADC[${i}]: "

cat /sys/bus/iio/devices/iio\:device0/in_voltage${i}_raw

done

Then set execute for the file.

root@raspberrypi2:/data/test# chmod 775 read_adc.sh

root@raspberrypi2:/data/test# ./read_adc.sh

ADC[0]: 3178

ADC[1]: 3183

ADC[2]: 3309

ADC[3]: 3192

ADC[4]: 3324

ADC[5]: 3197

ADC[6]: 3298

ADC[7]: 3177

In case anyone else find this entry when looking for answers I am updating this as of July 2022.

From Venus 2.8 onwards the extra analogue interfaces can be enabled in the console (and VRM) by editing the file /etc/venus/dbus-adc.conf.

To enable the additional interface they should be added to the file so that it looks like this:

device  iio:device0
vref    1.8
scale   4095
temp    0
temp    1
tank    2
temp    3
tank    4
temp    5
tank    6
temp    7

The vref and scale should be left unchanged for your system.

It is of course necessary that the circuits you have connected to the analogue inputs are the same as used by victron to drive their default tank and temperature sensors for this to work.

The additional channels are 0, 1 and 7

The additional interfaces can then be configured in settings->IO/Analogue Inputs

The raspberry pi 4has no analog inputs, you need an external ADC.