mcp3208 ADC raspberry pi

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sv-soleil asked Mar 20, '24

mcp3208 ADC raspberry pi

Here are step-by-step instructions on how to interface an mcp3208. I spent days following old posts and falling down various rabbit holes. What a nightmare. What I’ve done below works as of 2024.

Step 1: download anyspi.dbto

cd /u-boot/overlays

wget https://github.com/raspberrypi/firmware/raw/master/boot/overlays/anyspi.dtbo

Step 2: create run files

cd /opt/victronenergy/dbus_adc

mkdir service

nano run

#!/bin/sh

exec 2>&1

exec softlimit -d 100000000 -s 1000000 -a 100000000 /opt/victronenergy/dbus-adc

(Add above lines to the file “run”)

cd /opt/victronenergy/dbus_adc/service

mkdir log

nano run

root@raspberrypi2:/opt/victronenergy/dbus-adc/service/log# more run

#!/bin/sh

exec 2>&1

exec multilog t s99999 n8 /var/log/dbus-adc

(Add above lines to the file “run”)

chmod 755 /opt/victronenergy/dbus-adc/service/run

chmod 755 /opt/victronenergy/dbus-adc/service/log/run

ln -s /opt/victronenergy/dbus-adc/service /service/dbus-adc

Step 3: Add one line to /u-boot/config.txt

nano /u-boot/config.txt

(Add this to the end of the file)

dtoverlay=anyspi:spi0-0,dev="microchip,mcp3208"

Step 4: create your own dbus-adc.conf file

nano /etc/venus/dbus-adc.conf

Here you need to put your own custom information, for example:

device iio:device0

vref 1.8

scale 4095

label "Tank 1"

tank 4

reboot

On your remote console go to

Settings->I/O->Analog Inputs

tank monitor analog

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tadpole48 commented · yesterday

I'm in a similar position, but struggling with the "what works" above, I noted a couple of errors above with the use of "_" instead of "-" (Step 2 cd /opt/victronenergy/dbus_adc should be dbus-adc) and I do not appear to have the same file structure, when finished with the above my directory tree is different, I don't know where I went wrong!

Should the line "root@raspberrypi2:/opt/victronenergy/dbus-adc/service/log# more run" really be in the log/run file?

Any help would be much appreciated.

0 ·

tadpole48 commented · 6 hours ago

I think I managed to work out the errors in the original instructions, I hope you don't mind if I re-list it with my interpretation...

Step 1: Download anyspi.dbto

cd /u-boot/overlays

wget https://github.com/raspberrypi/firmware/raw/master/boot/overlays/anyspi.dtbo

Step 2: Create run files

cd /opt/victronenergy/dbus-adc

mkdir service

cd service

nano run

add these 3 lines to run file (then exit Nano with save)...

#!/bin/sh

exec 2>&1

exec softlimit -d 100000000 -s 1000000 -a 100000000 /opt/victronenergy/dbus-adc

mkdir log

cd log

nano run

add these 3 lines to run file (then exit Nano with save)...

#!/bin/sh

exec 2>&1

exec multilog t s99999 n8 /var/log/dbus-adc

Step 3: Change "run" files Permissions

chmod 755 /opt/victronenergy/dbus-adc/service/run

chmod 755 /opt/victronenergy/dbus-adc/service/log/run

Step 4: Create a Symbolic Link pointing to the new service folder in the /service/dbus-adc folder

ln -s /opt/victronenergy/dbus-adc/service /service/dbus-adc

Step 5: Add one line to /u-boot/config.txt

nano /u-boot/config.txt

add this 1 line to the end of the config.txt file (then exit Nano with save)...

dtoverlay=anyspi:spi0-0,dev="microchip,mcp3208"

Step 6: Create your own dbus-adc.conf file

nano /etc/venus/dbus-adc.conf

Here you need to put your own custom information, for example:

device iio:device0

vref 1.8

scale 4095

label "Tank 1"

tank 0

label "Tank 2"

tank 1

label "Tank 3"

tank 2

label "Tank 4"

tank 3

label "Temp 1"

temp 4

label "Temp 2"

temp 5

label "Temp 3"

temp 6

label "Temp 4"

temp 7

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