calc-text
tomekjersey0
Custom embedded calculator hardware design (KiCad) with integrated LoRa communication and low-power system architecture.
Components (12)
| Reference | Value | Description |
|---|---|---|
| U1 | Wio-E5-LE | STM32WLE5JC LoRa module, 863–928 MHz, 12x12 mm |
| U2 | TPS61299 | 95 nA quiescent-current synchronous boost converter, 1.2 A average input current limit, SOT-5X3 (DRL-6) |
| U3 | PCAL9535APW,118 | Low-voltage 16-bit I²C GPIO expander with interrupt and Agile I/O, TSSOP-24 |
| C1,C2 | 10uF | 10uF ±10%, 16V, X7R MLCC, 0805 |
| C3,C5,C6 | 100nF | 100nF ±10%, 50V, X7R MLCC, 0603 |
| C4 | 4.7uF | 4.7uF ±10%, 6.3V, X7R MLCC, 0603 |
| C7,C8 | DNP | Unpolarized capacitor |
| J1 | FH34SRJ-10S-0.5SH | 10-position 0.5 mm pitch back-flip ZIF FFC/FPC receptacle, 1.0 mm height, for 0.3 mm FFC/FPC |
| L1 | 1uH | 1uH ±20% molded power inductor, 2.5x2.0x1.0mm |
| L2 | 0R | 0Ω jumper, 1/16W, thick-film, 0402 |
| R1-R3 | 100kΩ | 100kΩ ±1%, 0.1W thick-film resistor, 0603 |
| R4-R6 | 10kΩ | 10kΩ ±1%, 0.1W thick-film resistor, 0603 |