//Description :This project will work by pressing the yellow button calls a pre-set SIM number, while the blue button shares the exact location via a Google Maps link. Serial.println("Press the ...

Fig. 5: Block diagram As shown in the block diagram (Fig. 5), there are also some other components like push buttons (SW1 and SW2), GPS module, GSM module, and power supply. The circuit diagram of the ...

wirelessSPI.begin (); //Start the nRF24 module wirelessSPI.setAutoAck (1); // Ensure autoACK is enabled so rec sends ack packet to let you know it got the transmit packet payload ...

Further, an optional “call – alert” facility is added to the security system, which will initiate a telephone call when push button switch S2 is activated by the user (or by another electronic module) ...

The buttons from the original phone remained, thanks to a custom designed resistive button footprint on the PCB and a bit of conductive ink. What’s surprising is this phone actually works.