It might be interesting to get also weather data from the own repeater QTH (parallel to the great [[usecaseweather|APRS-WX]] rubric 1080). This page describes the periodically sending of a temperature file to DAPNET, generated with a raspberry pi and a temper1f sensor.

Please take this proposal as blueprint for own purposes, therefor the process is kept simple without any if-loops and so on. Useless use of cat intended ;-)

Be aware, that you have to change user and paths to your own system, also root privileges are necessary.

====== Preparations ======


First you have to install pi-star-dapnetapi on your raspberry: https://github.com/AndyTaylorTweet/Pi-Star_Binaries_sbin/blob/master/pistar-dapnetapi

Short summary: Copy the script text from the homepage to a local file **pistar-dapnetapi.sh** and change the permissions with  **chmod +x pistar-dapnetapi.sh** to executable.

Then create a file **/etc/dapnetapi.key** and add the following content:

<code>
[DAPNETAPI] 
USER=oe7bsh 
PASS=irgendwasgeheimesvonhampagerde
TRXAREA=oe-all
</code>

Note: Use you hampager.de-credentials for **User** and **Pass** and choose a small fitting **TXAREA ** (https://hampager.de/dokuwiki/doku.php?id=transmittergroupgeneral).

For sending messages to the DAPNET we use an additional script from https://einstein.amsterdam/?page_id=2136: Copy the text for **msg-pipe.sh** into a local file **msg-pipe.sh** and change the permissions with  **chmod +x msg-pipe.sh** to executable again.

You have to change the placeholder „**yourcall**“ to your call sign (messages will be sent to this account).

====== Hardware ======


We use as sensor a Temper1F, which is attached via USB.

The device is recognized as TEMPer1F_V1.3:
<code>
sysop@oe7xxrpi2 ~ $ dmesg
[    2.022900] usb 1-1.2: new low-speed USB device number 4 using dwc_otg
[    2.145985] usb 1-1.2: New USB device found, idVendor=0c45, idProduct=7401
[    2.148555] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    2.153940] usb 1-1.2: Product: TEMPer1F_V1.3
[    2.156229] usb 1-1.2: Manufacturer: RDing
</code>

We need some packages for the reading of the TEMPer1F_V1.3:

<code>
apt-get install libusb-dev
git clone https://github.com/petervojtek/usb-thermometer.git
cd usb-thermometer/
cp 99-tempsensor.rules /etc/udev/rules.d/
make
cp pcsensor /usr/local/bin/
</code>

Now we can read the sensor with „**pcsensor**“:

<code>
sysop@oe7xxrpi2 ~ $ pcsensor
2018/11/03 11:43:16 Temperature 48.20F 9.00C
</code>

====== Scripting ====== 


We can now use pcsensor to create a file with the temperature data (we use **temprofan.sh**, again **chmod** **+x temprofan.sh** afterwards).

<code>
#!/bin/bash
cd /home/sysop/dapnet/
 #delete old data
rm smsrofan.txt
rm smsrofan2.txt
#fetch new data
echo „Temp Rofan“ >> /home/sysop/smsrofan.txt
/home/sysop/usb-thermometer/pcsensor -cm | head -n1 >> /home/sysop/smsrofan.txt
cat smsrofan.txt | xargs >> smsrofan2.txt
#transfer to the dapnet-api
cat /home/sysop/dapnet/smsrofan2.txt | /home/sysop/dapnet/msg-pipe.sh
</code>

We can now execute the script with **./temprofan.sh** and our pager should get the message:

{{ :usecase:temprofan.jpg?400 |}}

Finally we schedule the data TX to our pager (with **crontab –e**).

Three cron examples:<code>
every day at 7:05: 5 7 * * * /home/sysop/dapnet/temprofan.sh
at 5 past between 7 and 20: 5 7-20 * * * /home/sysop/dapnet/temprofan.sh
at 5 past at 7, 12 und 20: 5 7,12,20 * * * /home/sysop/dapnet/temprofan.sh
</code>
(Note: The last line should be enough, three weather infos each day).