Pulling data from 4.2.4 via GPIO?

I have a small project I am working on, with getting my HM 4.2.4 to send out data via a digital amatuer radio interface. But because I can't get the drivers for the protocols needed to build on openwrt (along with the kernel models), I am having to look into a solution of pulling the data from the ATMega on the 4.2.4 board via gpio (or any other method) on a rPi running debian.

Basically I am trying to pull the pin data from the ATmega chip from gpio (like with python). I can talk to the AT chip already, but I dont know how to pull down its info. Any help (even with other utils) would be fine as I am just looking for the raw values of the thermsister ports.

Thanks

Daniel

You want to pull down its info, like the status updates of temperature?
You might also need to turn off the kernel or init taking over the serial port for logging too in cmdline.txt and /etc/inittab

Also you can send commands if you want actual raw data like ADC count or resistance using the `echo -e \\n/set?sp=0A > /dev/ttyAMA0` (or 0R for resist). It's just a mini serial port, you can access it with any Python tools at 38400 baud.

Thanks. I'll try this when I get home.

I know I already have the console stuff disabled. I didn't think it was just a serial port.

Yup! Actually linkmeterd just opens /dev/ttyAMA0 and starts reading lines from it acting like a buffer between the serial interface and the web (well technically it goes through a unix socket to the web but the point is it is all just serial data).

Thanks that did it.

Getting output like this from my 4 probes connected:

$HMSU,225,72.7,70.4,69.5,69.8,100,99,0,100*26

Now to just get it updating the radio without spamming updates. But this is EXACTLY what I needed. Thanks again.

I'm excited to see your project when it is done! I try to document everything as much as possible so people can build things I never even imagined.