Have USB device TEMPerHumM12V1.3 working

[dabido31]

Hello,
I'm trying to make the device work with this code however I have failed so far as I get an error that TEMPerHumM12V1.3 subtype is not supported.

Do you see how I could solve this so that the device is recognized ?

Thanks!
David

[nanderson77]

I have the same sensor. TEMPerHum12V1.3 I'm trying to get temps to read into my Raspberry PI -
I put on the prerequisite software you list in the release notes but after that I'm such a newbie I have no idea what the next step is to update my application. I didn't do the original programming, I just downloaded an image that the temperhum's were supposed to work with and I get the message
/dev/hidraw4: Could not open device: Unknown device subtype string: TEMPerHum12V1.3

[kevinchow]

I am working on the same issue, replacing the 1.0 with 1.3 in "libtempered/temper_type.c" make it runnable.

.subtype_strings = (char *[]){ "TEMPerHumV1.0rHu", "TEMPerHumM12V1.3", NULL }
Result: Showing the wrong number, so still need some work.

/dev/hidraw1 0: temperature 834.75 °C, relative humidity 16275.3%, dew point -4075.0 °C

[kevinchow]

Here is a solution that will make it work for v1.3. I copy most of this from the v1.2 branch, all credit go to that creator.

Change device id/name

[root@localhost libtempered]# git diff temper_type.c
diff --git a/libtempered/temper_type.c b/libtempered/temper_type.c
index 1b00b20..86ec659 100644
--- a/libtempered/temper_type.c
+++ b/libtempered/temper_type.c
@@ -36,7 +36,7 @@ struct temper_type known_temper_types[]={
                        .response_count = 2,
                        .subtype_strings = (char *[]){
                                "TEMPerHumV1.0rHu",
-                               "TEMPerHumM12V1.0",
+                               "TEMPerHumM12V1.3",
                                NULL
                        }
                },
@@ -75,7 +75,7 @@ struct temper_type known_temper_types[]={
                        (struct temper_subtype*)&(struct temper_subtype_hid){
                                .base = {
                                        .id = 1,
-                                       .name = "TEMPerHumM12V1.0",
+                                       .name = "TEMPerHumM12V1.3",
                                        .open = tempered_type_hid_subtype_open,
                                        .read_sensors = tempered_type_hid_read_sensors,
                                        .get_temperature = tempered_type_hid_get_temperature,

Change equation

[root@localhost libtempered]# git diff type_hid/si7005.c
diff --git a/libtempered/type_hid/si7005.c b/libtempered/type_hid/si7005.c
index 11745da..369c34b 100644
--- a/libtempered/type_hid/si7005.c
+++ b/libtempered/type_hid/si7005.c
@@ -28,7 +28,8 @@ bool tempered_type_hid_get_temperature_si7005(

        // According to the Silicon Labs Si7005 datasheet, there's 32 codes per ℃
        // with 0x0000 = -50℃.
-       *tempC = ((float)temp) / 32 - 50;
+       //*tempC = ((float)temp) / 32 - 50;
+       *tempC = 175.72*temp/65536 - 46.85;

        return true;
 }
@@ -74,7 +75,8 @@ bool tempered_type_hid_get_humidity_si7005(
        // Temperature compensation
        relhum += ( tempC - 30 ) * ( 0.00237 * relhum + 0.1973 );

-       *rel_hum = relhum;
+       //*rel_hum = relhum;
+       *rel_hum = 125.*rh/65536 - 6;

        return true;
 }

Rebuild

make clean
make
make install 

Run

[root@localhost libtempered]# tempered
/dev/hidraw1 0: temperature 27.81 °C, relative humidity 26.3%, dew point 6.7 °C

[jamcole]

Great work @kevinchow, these changes work perfectly for me as well.

[normanr]

Note: nmenon/TEMPered@eccb950 is a commit for TEMPerHumM12V1.3.

[normanr]

and #40 is the PR for both V1.2 and V1.3