In Mohamed Maher’s 2017 DIY project, AHCS means “Automated Home Control System”: a PIC16F877A-based design intended to control appliances by phone keypad tones and monitor fire and motion. It is a specific legacy build, not a current commercial smart-home platform, and its feature descriptions should not be read as independently validated performance.
What “Smart Home System [AHCS]” refers to
The title refers to Mohamed Maher’s Hackster.io project, published June 23, 2017. The author described it as “This is the most easy AHCS (Automated Home Control System) based on 16F877A MCU’s taking into account peoples annual average income.” That is the author’s description of the project, not a measured cost or performance claim. Read the project page.
Its intended functions are remote appliance control, temperature display, and a separate password-enabled security function. The page does not provide attributable statistics about performance or adoption.
How the appliance control works
The user calls the system and presses a phone keypad number. Those DTMF (dual-tone multi-frequency) signals are decoded by an MT8870, and the system uses outputs connected through relays to switch appliances. The project description gives lights, an air conditioner, and water or gas access as examples. These are described use cases, not proof that every load or installation is suitable.
The Tool Desk
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- Onboard 4M crystal oscillator, the socket crystal frequency can be replaced at any time.
- The 4-bit independent keyboard is connected to RB0 RB1 RB2 RB3.
- Standard RS232 communication interface, microcontroller board and computer communication interface.
- 8 LEDs are connected to the RD port. When the J3 is plugged in, the LED is enabled. J3 is unplugged and the RD port is completely released.
- External 5V DC power interface (send USB power cable without additional purchase).
The parts list names two PIC16F877A microcontrollers, two 16×2 LCDs, one 4×4 keypad (with an ordinary keypad offered as an alternative), a temperature sensor, an IR TX/RX sensor, an MT8870 DTMF decoder, 5 V coil relays in a quantity dependent on the appliances, a buzzer, LEDs, resistors, capacitors, and buttons. This is the project’s stated list, not a verified current bill of materials. Anyone sourcing a PIC16F877A or other component should confirm package, electrical requirements, and compatibility with the intended design.
What the security features do—and do not establish
Fire alarm
The author describes fire detection and an alarm. The illustrative simulation substituted buttons for flame and IR sensor modules, so it does not demonstrate real-world sensor performance or establish that a completed installation will reliably detect fire.
Rank #2
- Core Learning Board: This PIC16F877A development board centers on the 877A chip, giving students a hands on surface to learn peripherals, so beginners run blink, read inputs and send serial text.
- Socketed Crystal: A 4M crystal oscillator sits in a socket that you swap at any time, so learners change timing to match a project, and clock experiments happen without desoldering a fixed resonator.
- Key and LED Bank: Four independent keys land on RB0 RB1 RB2 RB3 while eight LEDs hang off the RD port, and a J3 jumper enables the lamps, unplugging it frees the RD pins for other real world signals.
- RS232 Serial Link: A standard RS232 port connects the board to a computer, so code uploads and debug text flow over a serial cable, and a learner sees program output on a terminal window step by step.
- 5V USB Power: An external 5V DC jack runs the board and a USB power cable comes in the box, so no extra adapter purchase is needed, and a bench or laptop port the kit for lab experiments.
Motion sensing
The project describes motion sensing using either a PIR sensor or a simple IR transmitter/receiver arrangement. The page does not compare these approaches or establish which performs better.
Emergency calls
The author says a GSM module would be needed for an automatic emergency call and was omitted because it was expensive in the author’s context. Automatic calling is therefore not an implemented feature of the described project; the page does not establish that it calls emergency services.
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- ICSP Programming Interface: Standard ICSP simulation interface works with K150, and similar programmers, making code download and debugging easy for learners.
- Onboard Practice Modules: Includes 8 LEDs on RD port, 4 bit independent keys on RB0-RB3, plus LCD1602 and LCD12864 interfaces for hands on embedded experiments.
- Flexible Power Options: Supports USB power and external 5V DC input with included USB cable, ideal for desktop debugging, classroom labs, and bench testing.
- 4M Crystal Oscillator: Built in 4M crystal provides stable timing; socket design lets you swap crystal frequency easily for different learning projects.
- Expandable IO Access: VCC and GND power headers plus exposed pin headers give full access to all MCU IO ports for quick wiring and expansion in labs or at home.
Safety and practical limits
Relay switching for household appliances can involve hazardous mains voltage. The project page does not establish electrical-safety certification or validate a safe installation. Do not treat the description or simulation as wiring instructions: any mains-connected implementation needs qualified safety review and current specifications for the components and loads.
The 2017 publication documents a particular DIY design. It does not establish current support, component stock, exact replacement compatibility, or suitability as a turnkey home-control system.
Quick Recap
Best Value
- 【 programmer】: This circuit board programmer has a 4-bit independent keyboard connected to RB0 RB1 RB2 RB3. 8 LEDs are connected to the RD port. Plug in J3, the LED lights up, unplug J3, and the RD port is completely released.
- 【Interface】: Equipped with a standard RS232 communication interface, a communication interface between the microcontroller and the computer. The programmer has an external 5V DC power interface (with a USB power cord, which is more convenient).
- 【Interface】: The circuit board has an ICSP programming simulation interface (which can be connected to tools such as K150 ICD2). VCC GND pin header power expansion interface is used to connect or out 5 volt power.
- 【Easy to operate】: It uses an onboard 4M crystal oscillator, and the socket crystal oscillator frequency can be changed at any time. You can use the pin header to easily expand all IO ports of the microcontroller.
- 【About the product】: Its LCD interface is LCD1602, LCD12864. This is a development board, a minimum system learning board, which is very suitable for enthusiasts.
Rank #4
- ❥❥❥ The PIC16F877A Microcontroller Development Board features an onboard 4M crystal oscillator, allowing easy replacement of the socket crystal frequency for various applications.
- ❥❥❥ Equipped with a 4-bit independent keyboard connected to RB0, RB1, RB2, and RB3, this board enhances interactivity and supports various input methods for your projects.
- ❥❥❥ The board includes eight LEDs connected to the RD port, operable through the J3 connector, providing visual feedback for output operations and simplifying debugging.
- ❥❥❥ With a standard RS232 communication interface, the microcontroller board facilitates seamless communication with computers, making data transfer and programming straightforward.
- ❥❥❥ The board supports external 5V DC power supply via USB, an ICSP programming simulation interface for various tools, and easy extension of all IO ports using pin headers for flexible project development.
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