RaspBerry View Temperature

MIT App Inventor Help
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1

I am doing a PAP (Final Course Project), I have as a plan to make a program that I can see the RaspBerry temperature through wifi / internet, is there any way to do this through AppInventor?

2

Hi

We have a lot of examples using Arduino Microprocessors, but info on App Inventor and Raspberry Pi is sparse.

See my website:
https://www.professorcad.co.uk/appinventortips#TipsRaspberryPi

3

Suggest using HTTP / php and shell_exec, I assume your linux system on the raspberry is logging the data ?

1 Like
4

I use a code to see the temperature, it is not always registering, what I think was a way for me to connect to the raspberry by phone so I can see the temperature

5

hank you very much i went to see but i don't know if it will help but i will see better thank you very much

6

I use a code to see the temperature, it is not always recorded, what I want is to connect via wifi ip any way over the internet, connect my phone to the raspberry and see the temperature without touching the raspberry

7

How are you logging the temperature on your raspberry ? What command do you use to see the output ?Is it going to a file ?

2 Likes
8

!/bin/bash

Shell script: temp.sh

Autor: Santiago Crespo - Modificado por Marcos Matas

cpu=$(cat /sys/class/thermal/thermal_zone0/temp)
echo "Equipo => $(hostname)"
echo "$(date)"
echo "------------------------------"
echo "Temp.CPU => $((cpu/1000))'Cº"
echo "Temp.GPU => $(/opt/vc/bin/vcgencmd measure_temp)"
echo "------------------------------"
echo "CPU"
echo "$(vcgencmd measure_clock arm)Hz"
echo "$(vcgencmd measure_volts core)"
echo "Mem. del Sistema $(vcgencmd get_mem arm)"
echo "Mem. de la $(vcgencmd get_mem gpu)"
echo "------------------------------"
echo "Consumo de memoria"
echo "$(egrep --color 'Mem|Cache|Swap' /proc/meminfo)"

9

this is code I use

10

Your script:

    cpu=$(cat /sys/class/thermal/thermal_zone0/temp)
    echo "Equipo => $(hostname)"
    echo "$(date)"
    echo "------------------------------"
    echo "Temp.CPU => $((cpu/1000))'Cº"
    echo "Temp.GPU => $(/opt/vc/bin/vcgencmd measure_temp)"
    echo "------------------------------"
    echo "CPU"
    echo "$(vcgencmd measure_clock arm)Hz"
    echo "$(vcgencmd measure_volts core)"
    echo "Mem. del Sistema $(vcgencmd get_mem arm)"
    echo "Mem. de la $(vcgencmd get_mem gpu)"
    echo "------------------------------"
    echo "Consumo de memoria"
    echo "$(egrep --color 'Mem|Cache|Swap' /proc/meminfo)"

OK

If your raspberry does not have an http server with php setup, run these commands:

sudo apt update
sudo apt install apache2 -y
sudo apt install php libapache2-mod-php -y

full howto: https://www.raspberrypi.org/documentation/remote-access/web-server/apache.md

Then create a php file - getTemp.php, in your /var/www/html directory:

<?php
$output = shell_exec("sudo /home/<user>/temp.sh 2>&1");  // use correct full path to script
echo $output;
?>

Then test this by running the php file from a remote computer:

http://<raspberryIP>/getTemp.php

See what happens - there may be some permissions issues to resolve....

Your script requires some elevated privileges, so you may need to make apache user www-data a sudoer:

sudo visudo

(pick nano if offered)
add to the bottom of the file:

www-data ALL=(ALL) NOPASSWD: ALL

In your app, you can either use a webviewer to see the output, or web component to get the return value in .GotText

Nice script :slight_smile:

Here it is working for me (I edited the script to English)

image
image501×751 72 KB

1 Like
11

thank you very much i will see the script with my teacher to be able to do everything without any problems, thank you very much, if you have any questions i will contact you