Your Electronics Open Source

8 BIT MICROCONTROLLERS

Silicon Labs (Cygnal) 8051 Mixed Signal Controllers

• Silicon Labs [Official site]
• KEIL [Development systems]
• SDCC [Small Device C Compiler]

PIC Microcontroller 8 BIT

BANDE ISM Industrial, Scientific and Medical 1

16 KEYS capacitive keyboard

This plan was realized in order to be used like a hidden push-button panel to the edge of the monitor. In fact the card has been inserted in a fissure in the wood, therefor hidden, and the activation of the keys happened for a capacitive effect from a distance of 1 cm (thickness of the used wood). The signalling of the pressed key it is sent to a further elaboration device both in SPI format and in UART (to convert in RS232 in order to read the key pressed directly on the PC with Hyperterminal).

Electronic Resistive Key

The code comes established from the value of 3 resistances present in the key.

How to connect TELIT GM862 module to the PICMICRO.

The application uses the connection between UART of the PIC and UART of the TELIT through Level Shifter (realized with 2 transistors NPN-PNP) in order to adapt signals to 5V of micro with those to 2V8 of the module. A BCR22PN could also be used as an example or a 74HC125 for transferring the signals from 2V8 -> 5V while from 5V -> 2V8 a diode in series with the cathode towards 5V and one resistance of pull up between anode and 2V8 (outgoing from the module PowerControl)

Electronic key with Microcontroller

The electronic key IperKEY is a sophisticated security system that is born by establishing the right compromise between installation facility and guarantee of emergency for the final customer.The access codes are autogenerated through an algorithm that makes impossible any type of interference. IperKEY finds its natural application in the security systems, therefore in order to activate and deactivate antitheft centrals, in the automatic doors, the access control etc. With a single key it can be managed up to 8 systems and with the multizone version the zones of the system can be split up directly from the key hole! Performances as the possibility to change code and reprogramming all the keys from the key hole thanks to the key MASTER renders professionally to the forefront. IperKEY has been planned following the CEI norms 79/2 and directives on electromagnetic compatibility (EMC).

 
The official magazine of Elektor

Phone line protection or network protection

If you must realize a PROTECTION, AC-safe is your starting point.
In fact it is a circuit where it is possible to experience several types of protection. You will have the possibility to protect the telephone line, therefore the apparatuses connected to it (modem etc.), from lightnings and the extracurrents, or with opportune modifications you will be able "to filter" disturbs on the electrical power 230Vac.

PHONE DIALER ACCREDITED PP.TT.

SINCLAIR is an one channel PHONE DIALER, able to send, on the commuted phone line, the alarm messages previously recorded to the NOT volatile DAST memory, to the set numbers, previously saved on the NOT volatile EEPROM memory. Moreover it introduces a very important characteristic, the RING DETECTOR

Allow to construct a network for the domestic use with the devices for an easy availability and cheap for whichever hobbista. The idea is born after long search in Internet in order to find something from which leaving in order to make to communicate dispositive small you ( possible the arcinoti PIC) between them in sure and above all economic simple way.
As I thought I have found many ideas but nothing concrete to construct, so I have decided to put together the ideas and indications hardware and software found, to construct one small net.