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Behold is a device designed to help blind people make phone calls easily. It uses an Arduino board, a GSM module (like SIM800L), a button, a power supply (batteries), wires, and a small case. When the button is pressed and held for 3 seconds, the device makes a call to a pre-set phone number. To set it up, you need to connect the GSM module and the button to the Arduino, upload the code to the Arduino, and power the device. Once it’s ready, you can wear it on your finger. Pressing the button will automatically call the pre-set number, making communication easier for the blind. Behold Mobile For Blind project for student
Components:
- Arduino board-1
- GSM module (SIM800L)-1
- Button-1
- Power supply (batteries)-1
- Wires(M-M)-10
Connections
- GSM Module (SIM800L) to Arduino:
- RX Pin of GSM Module to TX Pin (8) of Arduino
- TX Pin of GSM Module to RX Pin (7) of Arduino
- VCC Pin of GSM Module to 5V Pin of Arduino
- GND Pin of GSM Module to GND Pin of Arduino
- Button to Arduino:
- One leg of the button to Digital Pin 2 (BUTTON_PIN in the code)
- The other leg of the button to GND
- Power Supply:
- Connect a suitable battery pack or power source to power both the Arduino and the GSM module. Ensure it provides stable voltage and sufficient current (GSM modules may require bursts of current during operation).

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