COMPONENTS OPEN HARDWARE BRAVODIGI v2.0 U1 - LM7805 D1 - 1N4001 C1, C2, C3, C4 - Capacitor 104 100nF R1 - 100k Resistor R2, R6, R7, R8, R9, R10 - 1k Resistor R3 - 8.2k Resistor R4 - 3.9k Resistor R5 - 2.2k Resistor TX, RX - Generic Led T1, T2 - Transistor NPN 2n2222 DB9 MALE (optional) HC-05 (optional) U2 - Attiny85 for Wathdog using PB1 and T2 (optional)