Go to advanced search

by p4ppo
Mon Oct 02, 2017 7:35 am
Forum: Italiano
Topic: Protezione Raspberry da picchi di tensione
Replies: 1
Views: 521

Protezione Raspberry da picchi di tensione

Buongiorno a tutti. Abbiamo un'applicazione industriale che si appoggia su Raspberry, in questo caso la versione Pi3 model B. I raspberry sono alimentati da trasformatori Meanwell 5v-230 e sono sotto un magnetotermico in un quadro. Ocasionalmente succede che l'impianto elettrico cui sono attaccati a...
by p4ppo
Wed Jun 14, 2017 1:07 pm
Forum: Troubleshooting
Topic: Rasbian Jessie, i can go online but no access to
Replies: 6
Views: 742

Re: Rasbian Jessie, i can go online but no access to

Thanks! It works now, i'd never found this alone...
by p4ppo
Fri Jun 09, 2017 8:53 am
Forum: Troubleshooting
Topic: Rasbian Jessie, i can go online but no access to
Replies: 6
Views: 742

Re: Rasbian Jessie, i can go online but no access to

I am going to take an educated guess: you have configured static addresses and you did not notice the change that occurred with the introduction of dhcpcd. maybe not completely... i have added in /etc/dhcpcd.cong this settings at the end interface eth0 static ip_address=10.10.8.51 static routers=10...
by p4ppo
Thu Jun 08, 2017 2:23 pm
Forum: Troubleshooting
Topic: Rasbian Jessie, i can go online but no access to
Replies: 6
Views: 742

Rasbian Jessie, i can go online but no access to

Hello, i have installed Rasbian Jessie on my raspberry PI3, it's the first time, I usually used Wheezy and now i'm facing a problem i did not have before... I have some berries in a LAN, let's say 10.10.8.x Thera are also other LANs, 10.10.9.xx, 10.10.10.xx and so on and they are all linked (from my...
by p4ppo
Wed Feb 08, 2017 10:18 am
Forum: Automation, sensing and robotics
Topic: Create a clients/server communication via RF
Replies: 4
Views: 1261

Re: Create a clients/server communication via RF

Thanks Moses, so do you think WiFi is reliable for a production environment?
by p4ppo
Tue Feb 07, 2017 7:59 pm
Forum: Automation, sensing and robotics
Topic: Create a clients/server communication via RF
Replies: 4
Views: 1261

Create a clients/server communication via RF

Hello, we have an application based on raspberry pi. We have a server and several clients which now communicates via LAN cable. Every client has some sensors (PIR, Ultrasonic or others). Our framework is written in Java and our server simply exposes some API webservices and clients connect to it. No...
by p4ppo
Sun Nov 13, 2016 4:39 pm
Forum: Italiano
Topic: Connessione opto accoppiatore per leggere la 230
Replies: 0
Views: 287

Connessione opto accoppiatore per leggere la 230

Buonasera a tutti, ho un dubbio che non riesco a risolvere... Ho la necessità, sulla Pi, di leggere la presenza della tensione a 230V. Per fare ciò ho preso un input digitale ottico, nello specifico il Grayhill, il 70M-IAC5A (qui la scheda tecnica http://www.grayhill.com/assets/1/7/IO_Mod_AC_Input.p...
by p4ppo
Sat Oct 08, 2016 10:19 am
Forum: Italiano
Topic: Leggere lo stato di un contattore
Replies: 1
Views: 598

Leggere lo stato di un contattore

Salve a tutti, vorrei un parere. Abbiamo un'applicazione fatta con i raspberry che governa dei contattori in un quadro elettrico. Questi contattori vengono pilotati da un rele comandato dalla rasp Chiaramente il rele funziona a impulsi, ogni impulso alza o abbassa il contattore, per cui non conosce ...
by p4ppo
Thu Feb 04, 2016 3:07 pm
Forum: Italiano
Topic: Utilizzare tutti i pin come semplici GPIO
Replies: 5
Views: 1175

Re: Utilizzare tutti i pin come semplici GPIO

Grazie Massi sono riuscito, leggendo un po', a disabilitare la UART e la SPI ed ora funzionano tranquillamente come normali GPIO. Sull'I2C devo studiare un po' perché ho un po' di carenze lato elettrico per capire se e come quelle resistenze possono darmi fastidio e se posso bypassarle in qualche mo...
by p4ppo
Thu Feb 04, 2016 9:59 am
Forum: Italiano
Topic: Utilizzare tutti i pin come semplici GPIO
Replies: 5
Views: 1175

Re: Utilizzare tutti i pin come semplici GPIO

Grazie Massi, e sai indicarmi dove posso trovare qualche guida per capire come fare? Non sono un esperto di elettronica, mi occupo di software...
Da quello che capisco, però, sulla i2c posso fare poco, giusto?
by p4ppo
Thu Feb 04, 2016 8:25 am
Forum: Italiano
Topic: Utilizzare tutti i pin come semplici GPIO
Replies: 5
Views: 1175

Utilizzare tutti i pin come semplici GPIO

Buonasera a tutti, per un progetto ho la necessità di utilizzare quanti più GPIO possibili per ogni raspberry. Ho provato ad usare quelli esistenti come se lo fossero ma le periferiche ed i sensori non rispondono come dovrebbero per cui credo ci sia qualche cosa a livello hardware di differente. Che...
by p4ppo
Tue Nov 03, 2015 3:46 pm
Forum: Java
Topic: JavaNullPointer Exception while creating an object
Replies: 1
Views: 778

JavaNullPointer Exception while creating an object

Good evening everyone, I'm quite new to Java, so I'm having some problems while initializing a class with pi4j. I have a Sensor.class with its constructor. Its parameter is a specific pin i need to pass to the constructor because I'm initializing more than one object, and everyone needs a specific p...
by p4ppo
Mon Jul 06, 2015 1:33 pm
Forum: Java
Topic: RFID reader RC522 SPI usage
Replies: 15
Views: 10077

Re: RFID reader RC522 SPI usage

If it works with Python, then it is wired correctly, and your issue is a pi4j software. Obviously it's connected to the ground and the 3.3V pin. I've connected it like this picture, as I've seen in a lot of tutorials around the web... http://bsd.ee/~hadara/blog/wp-content/uploads/2014/01/rc522_rfid...
by p4ppo
Mon Jul 06, 2015 1:16 pm
Forum: Java
Topic: RFID reader RC522 SPI usage
Replies: 15
Views: 10077

Re: RFID reader RC522 SPI usage

Why SDA? It should be /CE0 or /CE1, and you also need to connect GND Also, if your RFID reader has 5V outputs, you need to divide MISO down to 3v3 Hello, I'm trying to use my RFID reader with pi4j libraries, but with no success. It is connected through SPI interface (MISO-MOSI, SCK and SDA). I have...
by p4ppo
Mon Jul 06, 2015 11:37 am
Forum: Java
Topic: RFID reader RC522 SPI usage
Replies: 15
Views: 10077

RFID reader RC522 SPI usage

Hello, I'm trying to use my RFID reader with pi4j libraries, but with no success. It is connected through SPI interface (MISO-MOSI, SCK and SDA). I have the SPI ports correctly opened on my raspberry. I cannot even start to think how to manage it, no way to know how to read from the reader. Anyone h...
by p4ppo
Mon Mar 16, 2015 6:01 pm
Forum: Java
Topic: Kernel error - Disabling IRQ#50 when using pi4j
Replies: 0
Views: 536

Kernel error - Disabling IRQ#50 when using pi4j

Good evening, this is my first post, I'm quite new in this world, i come from Java and I'm starting working on raspberry pi. I came across a strange behavior of my application using pi4j. I had to use 3 digital output on the P5 connector, and everything went well. This is how I inizialized them publ...

Go to advanced search