Life of RaspberryPI: Boost the frequency of Raspberry PI 4

I have bought recently the new RaspberryPI 4 and built a custom case for it. You can see that the fan is quite big, powered by a separate 12V power supply. That means it will have no CPU temperature issues, in standby the temperature is about 33°C. Then, why not take full advantage of the quad core 1.5GHz processor? By default, the PI 4 runs at 600MHz for low power consumption. So, to change this, just edit the config file: root@raspberrypi:~#...

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Controlul unui motor folosind o punte H

Salut, In acest articol voi prezenta modul in care un motor poate fi controlat cu ajutorul unei punti H. O punte H este un circuit construit din 4 tranzistoare care actioneaza ca niste intrerupatoare, iar pozitia acestora determina sensul de rotire al motorului. Punte H   In stanga figurii de mai sus comutatoarele A1 si A2 sunt inchise si curentul va trece prin ele iar sensul va fi prin A1-motor-A2 si motorul se va roti in sensul acelor...

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Controlul turatiei unui motor in functie de luminozitate folosind o fotodioda si un microcontroller

         Acesta este un proiect realizat in anul IV de facultate (2013) la cererea unor colegi mai neinitiati in ale electronicii.          Desi pe piata au aparut de ceva timp module de senzori (shield), am preferat la acel moment sa  construiesc unul propriu: preiau tensiunea captata de o fotodioda expusa luminii ambientale si o amplific cu un AO cu amplificare...

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Life of RaspberryPI: Remote Desktop through VNCViewer

Hi everyone, If you run RaspberryPI headless because you don't have a monitor, you might want to see the RaspberryPI's Desktop remotely. For this, you need to set up a VNC server on RaspberryPI and a VNC client on your laptop. The connection will be made via LAN cable, the same you are using for SSH control. 1. Set up VNC server on RaspberryPI Connect with Putty to your device and send this commands: root@raspberrypi:~# sudo apt-get install...

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Life of RaspberryPI: Connect the PI to the internet.

Hi everyone, In the previous post I showed you how to install Raspbian and how to connect to you Raspberry PI. Now, you may want to connect it to the internet. There are many ways to do it. 1. USB tethering from mobile phone This method saves your RJ-45 port which you can continue to use for SSH connection. First, you have to connect your mobile phone to one Raspberry PI USB port via microUSB cable. In your phone go to Settings > Tethering...

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Life of RaspberryPI. Hello World!

Hi everyone, So far I have only been using microcontrollers in my projects. They were doing fine the tasks they were supposed to (usually one), but had their limitations such as low clock speed (20MHz) and more important, it was extremely hard to implement a real time operating system and to run parallel tasks. A RaspberryPI microcomputer is a tiny board that offers both the performances of a real computer and the features of a microcontroller:...

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Conectarea unui microcontroler la o tastatura si un ecran LCD

Salut, In acest articol voi prezenta cum putem citi o tasta apasata a unei tastaturi si afisarea acesteia pe un ecran. Am scris programul in mikroC PRO for PIC pentru microcontrollerul PIC16F887 care foloseste oscilatorul intern de 8MHz. 1. Tastatura Tastatura este practic o matrice compusa din M linii x N coloane. La intersectia unei linii cu o coloana se afla un intrerupator care odata apasat face contact intre linia si coloana respectiva. ...

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