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Door Spy using Raspberry Pi

Communicate with a visitor using your smartphone

Door Spy using Raspberry Pi
An unexpected visitor can be a welcome surprise, but at other times you will have regretted answering that doorbell when and finding a less desirable guest on your doorstep. An intercom with a camera at the front door can be a solution, but that’s of no use to you when you are not at home. With the project presented here you can, in principle, see from anywhere in the world who rang your doorbell, have a conversation with your visitor and even remotely open the door for them, provided you have your smartphone on you.
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Products
Relevant websites
Component List
Resistors
Default: SMD 0603, 1%, 0.1W)
R1 = 110kOhm
R2 = 43kOhm
R3 = 470Ohm
R4,R12 = 1kOhm
R5,R11 = 2.2kOhm
R6 = 1.5kOhm
R7 = 3.3kOhm
R8,R10,R13 = 100Ohm
R9 = 47kOhm
R14 = 0Ohm
R15,R16,R17 = 22Ohm
Capacitors
C1 = 1000µF 10V, radial SMD
C2,C3,C4,C18,C24 = 100nF, X7R, SMD 0805
C5,C23 = 100µF 16V, SMD 2312
C6,C7,C8,C12,C13,C14,C19,C20,C21,C22,C26 = 33pF, X7R, SMD 0805
C9,C10,C11,C15,C16,C17,C25 = 10pF, X7R, SMD 0805
Semiconductors
D1,D2 = 1N4148, SOD-323
D3,D4,D5,D6 = PGB1010603MR, SMD 0603
D7 = SMF05CT2G, SC-88
LED1,LED2 = LED, green, 50mcd, 2.1V @ 20mA, SMD 0805
T1,T2,T3,T4 = 2N7002, SOT-23
IC1 = MIC29302WU TR, TO-263
Miscellaneous
Mod1 = GSM module, Quectel type M95
SIM1 = microSIM socket (Molex 78723-1001)
ANT1 = SMA connector, PCB mount (Molex 73391-0070)
+ SMA antenna, right angled, (RF Solutions ANT-GHEL2R-SMA)
K1 = 10-way pinheader socket, 0.1’’ pitch (optional)
K2,K6 = 2-way pinheader socket, 0.1’’ pitch (optional)
K3,K4 = 7-way pinheader socket, 0.1’’ pitch (optional)
K5 = 10-way (2x5) pinheader socket with extended pins (Samtec ESQ-105-14-G-D)
S1 = 2-pin pinheader for doorbell connection (with make contact)
JP1 = 2-pin pinheader with jumper
LS1 = 2-pin pinheader for mini loudspeaker connection (8Ohm, 1.5W)
Mic1 = 2-pin pinheader for electret microphone connection (ABM-715-RC)
Re1,Re2 = relay, SMT, DPDT, 2A, 5VDC (Kemet EE2-5NU)
Raspberry Pi B+, 2 B or 3 B
Raspberry Pi Camera Board (V1.3)
PCB # 150400-1 from Elektor Store
or
PCB with SMDs preassembled: 150400-71 from Elektor Store
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