how to build gsm based cell phone
#GSM
#cell phone
#communication
#wireless
#microcontroller
#SIM module
#antenna
#call handling
#SMS
#DTMF
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Secured room access system
Security is a primary concern in daily life, and an access control system is a crucial component of a security framework. The microcontroller-based digital lock described here is an access control system that permits only authorized individuals to enter a...
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...
DTMF Transeivers
The A3425 is a dual-output-channel bipolar switch, with each channel consisting of a complete Hall-effect sensor circuit that includes a dedicated Hall element and a separate digital output for processing speed and direction signals. The independent Hall elements (E1 integrated...
Radio Remote Control Using DTMF
This circuit diagram represents a remote control system utilizing DTMF (Dual Tone Multi-Frequency) signals. DTMF signals, generated by pressing numbers on a telephone keypad, serve as the control mechanism for the system. The DTMF tones are employed to modulate the...
Preprogrammed single-chip microcontroller
Twenty-five musical keys and 25 LEDs are provided to denote F to F" with half notes in between. Memory can store a played tune. There are ten preprogrammed tunes (each has an average of 55 notes) masked in the chip....
Wireless mains voltage tester
This circuit is designed to test the presence of mains voltage without direct electrical contact with the mains line. The core component of this circuit is the CMOS IC CD4033, which features a five-stage decade Johnson counter and an output...
GSM Remote Control Gate Control Schematic
Power is supplied by continuous voltage, which is not always stabilized, applied to PWR + and - at a value between 5 and 32V. This voltage is filtered at the bottom by a diode (D1) that protects against polarity inversion,...
GSM Remote Control 2 IN and 2 OUT DTMF
Introduction In this post, the latest application developed from the modular remote control project initiated in the April issue is presented.
The modular remote control system is designed to enhance user interaction with various electronic devices through a flexible and customizable...
Password Based Door Locking
Security is a prime concern in our day-to-day life. Everyone wants to be as much secure as possible. An access control for doors forms a vital link in a security chain. The microcontroller based Door locker is an access control...