4X3 Keypad Interface Circuit
#keypad
#interface
#matrix
#input
#digital
#circuit
#switches
#encoder
#microcontroller
#input device
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Alarm Control Electronic Keypad Project
The integrated circuit (IC) is a quad 2-input "AND" gate, specifically a CMOS 4081. These gates output a HIGH signal only when both inputs are HIGH. When the key connected to pin E is pressed, current flows through resistor R1...
Training Boxing timer schematic
A timer is being developed for circuit training or boxing training. The timer does not require any external input, except for a reset function. The project can be simplified using a microcontroller, such as the PIC12F635, which is cost-effective at...
Digital pulse width measurement circuit diagram CD4518 and CD4069 the
A digital pulse width measurement circuit is presented. It operates with a 100 kHz reference frequency to count the pulse width of the input signal. The count value represents the measured pulse width displayed on four seven-segment LED displays. The...
Keypad Combination Lock Relay
Only one out of 9,999 possible codes has the power to unlock this simple, yet effective, electronic lock. A combination lock is not just a perfect system to protect your belongings, it is also a valid system to let everyone...
IC Encoder Chip
This function is not complex and can be easily implemented in a Programmable Logic Device (PLD) or Field Programmable Gate Array (FPGA). However, implementing this function in a small PLD may consume most of the device's I/O pins, which could...
Encoder-decoder
The transducer circuit can function as either a tone encoder or decoder by adjusting the position of switch Sl. The operating frequency of this dual-purpose circuit is set by capacitors C3 and resistor R2. Capacitors C1 and C2 are not...
Aladin
Whoever thinks about reproducing an interface for the Aladin should first of all be aware of the fact that there are two different versions of the interface. The first version, easier to assemble, enables the user to transfer dive data...
Homemade Digital CALL-ID English Version
The reason for this project was to facilitate a quick installation for a local friend 10 km away, enabling the start of real-life testing to identify and resolve bugs and problems before releasing it to other users. The software is...
Digital Calender Circuit
This is a digital calendar circuit that utilizes a microcontroller to display the date, day, and month on an LED display. The entire system is managed by an 8-bit microcontroller, which operates based on a program embedded in its ROM....