TC74 amb nodejs
En MTV em presenta el TC74.
- Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word
- Temperature sensor : diode
- The TC74 acquires and converts temperature information from its onboard solid-state sensor with a resolution of ±1°C
So the maximum bus length of an I2C link is about 1 meter at 100 Kbaud, or 10 meters at 10 Kbaud.
url
Llegirem la temperatura mitjançant python i la servirem mitjançant nodejs :
{ tc74 @ odin }
repositori github, npm i codi nodejs
El entorn és :
sag@odin:~/tc74 $ node -v
v11.13.0
sag@odin:~/tc74 $ npm -v
6.9.0
sag@odin:~/tc74 $ git --version
git version 2.1.4
Anem fent :
sag@odin:~/tc74 $
git init
Initialized empty Git repository in /home/sag/tc74/.git/
get .gitignore
edit .gitignore
sag@odin:~/tc74 $ git remote add origin https://github.com/sebastianet/tc74
sag@odin:~/tc74 $ git remote add origin https://user:pwd@github.com/sebastianet/tc74.git
sag@odin:~/tc74 $ git remote -v
origin https://github.com/sebastianet/tc74 (fetch)
origin https://github.com/sebastianet/tc74 (push)
sag@odin:~/tc74 $ git push -u origin master
error: src refspec master does not match any.
error: failed to push some refs to 'https://github.com/sebastianet/tc74'
sag@odin:~/tc74 $
git commit -am "v1.0 - save units to github"
[master (root-commit) 97e4373] v1.0 - save units to github
2 files changed, 37 insertions(+)
create mode 100644 .gitignore
create mode 100644 servidor.js
sag@odin:~/tc74 $ git push -u origin master
To https://github.com/sebastianet/tc74.git
! [rejected] master -> master (fetch first)
error: failed to push some refs to 'https://github.com/sebastianet/tc74.git'
hint: Updates were rejected because the remote contains work that you do not have locally.
sag@odin:~/tc74 $ git pull origin master
warning: no common commits
remote: Enumerating objects: 3, done.
remote: Counting objects: 100% (3/3), done.
remote: Total 3 (delta 0), reused 0 (delta 0), pack-reused 0
Unpacking objects: 100% (3/3), done.
From https://github.com/sebastianet/tc74
* branch master -> FETCH_HEAD
* [new branch] master -> origin/master
Merge made by the 'recursive' strategy.
README.md | 1 +
1 file changed, 1 insertion(+)
create mode 100644 README.md
sag@odin:~/tc74 $
git push -u origin master
Counting objects: 6, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (5/5), done.
Writing objects: 100% (6/6), 1023 bytes | 0 bytes/s, done.
Total 6 (delta 0), reused 0 (delta 0)
To https://github.com/sebastianet/tc74.git
cb55695..a41b065 master -> master
Branch master set up to track remote branch master from origin.
Tenim el repositori funcionant.
codi nodejs
Tenim el codi al R3 i a github
Ara ajustem el npm, manegador dels paquets de nodejs que farem servir.
sag@odin:~/tc74 $ npm init -> package.json
Si en engegar la aplicacio tenim aquest error : "Error: Cannot find module 'express'" es que hem de instalar el modul :
sag@odin:~/tc74 $ npm install -g express --save // install "global", save in "package.json"
+ express@4.17.1
added 50 packages from 37 contributors and audited 50 packages in 7.283s
found 0 vulnerabilities
Si en engegar la aplicacio tenim aquest error : "Error: Cannot find module 'python-shell'" ....
Per engegar manualment l'aplicacio, fem "npm start"
sag@odin:~/tc74 $ npm start
> tc74@1.0.0 start /home/sag/tc74
> node servidor.js
temperature express server v 1.0 listening on port [8123].
2020/07/07 - 15:11:57 - +++ /get temp, gimme json
2020/07/07 - 15:11:57 - (+1) python temperature (31).
Fem que la APP engegi amb el R3 using "/usr/bin/odin_restart",
i és accessible per tot el mon a myraspiodin
... precedidos por los dioses, avanzaron lentamente apoyados en sus bastones, frenados por el peso de los años y fatigados por la interminable cuesta
other ways to measure temp
We can use gpio
internal devices : CPUTemperature
See /home/sag/tc74/soc_temp.py @ r3 ( version 2.7 only )
sudo apt remove python-pip
sudo apt autoremove
sudo pip install gpiozero
sudo pip install vcgencmd
python3 -m pip install ifaddr
