Within the earlier article of this DIY machine collection, the smallest touchscreen telephone was created utilizing the SIM800L for the 2G mobile community and a spherical contact show. This design is now finalised by integrating the beforehand developed person interface (UI) with its core capabilities and consolidating every part right into a single system powered by a real-time working system (RTOS). The mobile community compatibility can also be enhanced by changing the 2G GSM module with a 4G GSM module, enabling help for LTE and 4G networks (see Fig. 2). Extra functions, akin to a calculator and different primary apps, are included. Your entire system operates on the RTOS platform. Fig. 1 illustrates the IndusPhone calculator software.
Fig. 2 illustrates the 4G GSM module (left) and MIC (proper). The MIC used on this machine is an electret microphone capsule, which is usually utilized in small digital gadgets like cell phones, listening to aids, and numerous audio recording gadgets. These microphones are compact, delicate, and ultimate for small form-factor functions. The tiny holes on high permit sound to enter, the place a diaphragm contained in the capsule converts sound waves into {an electrical} sign. The parts required to construct the IndusPhone are listed within the desk above.
| Invoice of Supplies | ||||||||
| ID | Identify | Designator | Footprint | Amount | Producer Half | Producer | Provider | Provider Half |
| 1 | Buzzer | B1 | Buzzer-12mm SMD | 1 | ||||
| 2 | CST816 | CN1 | QFN20-3×3 | 1 | CST816-S | Hynitron Microelectronics | LCSC | |
| 3 | GMI6027P-2C30DB | MIC1 | MIC-TH_BD6.0-P1.90-D0.4-L | 1 | GMI6027P-2C30DB | INGHAi | LCSC | C233898 |
| 4 | ADIA7670C | MOD2 | ADIA7670C | 1 | ADIA7670C | ADIA7670C | Rajguru | ADIA7670C |
| 5 | Speaker | S1 | SMD 3 solder | 1 | ||||
| 6 | GC9A01 | U1 | GC9A01 TFT LCD display | 1 | GC9A01 | GoldenMorning show | ||
| 7 | IndusBoard | U2 | IndusBoard Coin | 1 | IndusBoard Coin | IndusBoard | IndusBoard | Coin |
| 8 | Antenna | U4 | Antenna | 1 | ||||
Circuit diagram and dealing
Fig. 3 presents the ultimate circuit diagram for the world’s smallest programmable IndusPhone machine. It’s constructed across the 4G GSM module (A7670C), self-capacitance contact chip (CST816), microphone (GMI6027P), SMD speaker, LCD display (FC9A01), antenna, and show. Your entire system is powered by a 3.3V battery. The buzzer will ring when an incoming name is detected and serves as an enter to the IndusBoard for interrupts associated to the incoming name.
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