gsm interfacing with 8051 circuit

This circuit features a DS1236 component that monitors and controls the power supply and software execution of a processor-based system, while also providing a pushbutton reset function. An out-of-tolerance condition triggers the RST and RST outputs to enter the active...

Garage door open indicator

There are battery-powered wireless systems available, but the ones encountered would indicate that the door was open even if it was left ajar for ventilation. A system was desired that would alert when the door was fully raised. Additionally, it...

Remote-Controlled Telephone/Fax Machine Switch

This system uses a transmitter operating at approximately 100 kHz to control a remote receiver. A line splitter can connect the transmitter to the active telephone line. The transmitter is a CMOS oscillator equipped with output buffer stages to drive...

Microcontroller interface electrometer

A method for measuring static electricity for a science project was sought. An old copy of "Getting Started in Electronics" by Forrest M. Mims III was referenced for guidance. To create a static electricity measurement circuit, a simple design can be...

Digital voltmeter using 8051 microcontroller AT89S51 with circuit diagram and software

A simple 0-5 digital voltmeter utilizing the 8051 (AT89S51 microcontroller) is presented, accompanied by a circuit diagram and assembly language (ASM) code. This digital voltmeter is designed for straightforward voltage measurement. The circuit employs an AT89S51 microcontroller, which serves as the...

Microcontroller interfacing with RS 232

Standard serial interfacing of a microcontroller (TTL) with a PC or any RS232C standard device requires a TTL to RS232 level converter. A MAX232 is used for this purpose. It provides a 2-channel RS232C port and requires external 10µF capacitors. The...

Wireless IR Headphones circuit

This wireless infrared (IR) headphones circuit project enables the transmission of audio signals through an infrared connection. The circuit consists of two main components: a transmitter and a receiver. Unlike radio frequency (RF) transmitters, both parts of this application must...

8051 flash programmer

In certain scenarios, a portion of application code may be stored in the Flash/EPROM version of the 8031 microcontroller, while the remaining code resides in an external EPROM, particularly in expanded systems. The introduction of the 8051 Programmer serves as...

analog light dimmer circuit connected to microcontroller

Assistance is required to modify a light dimmer circuit connected to a PIC12C508 microcontroller. This circuit is designed for the... The light dimmer circuit utilizing the PIC12C508 microcontroller serves to control the brightness of a light source through pulse width modulation...