U1 CH340G USB serial converter, UART, SOIC-16 U2 AMS1117-3.3 1A Low Dropout regulator, positive, 3.3V fixed output, SOT-223 U3 ATmega328P-A 20MHz, 32kB Flash, 2kB SRAM, 1kB EEPROM, TQFP-32 U4 RFM95W-868S2 Low power long range transceiver module, SPI and parallel interface, 868 MHz, spreading factor 6 to12, bandwidth 7.8 to 500kHz, -111 to -148 dBm, SMD-16, DIP-16 AE1 Antenna Antenna with extra pin for shielding AE2 Anten. Antenna with extra pin for shielding C1,C3,C9,C10 22pF Unpolarized capacitor, small symbol C2 0.47uF Unpolarized capacitor, small symbol C4 1nF Unpolarized capacitor, small symbol C5,C8 0.1uF Unpolarized capacitor, small symbol C6 100nF Unpolarized capacitor, small symbol C7 10uF Polarized capacitor, small US symbol D2 SS32 20V 3A Schottky Diode, SMA D3 Power Light emitting diode, small symbol D4 Rx_LED Light emitting diode, small symbol