Modular RF Link using Manchester Code (1)
Part 1: Hardware
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Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
Transmitter
R1 = 0Ohm
R2,R6 = 180Ohm
R3 = 470Ohm
R4 = 10Ohm
R5, R9 = 1kOhm
R8 = 680Ohm
C1,C2,C3,C7,C8 = 100nF
C4,C6 = 10µF 25V
C5 = 3.3µF 50V
IC3 = TXM-315-LR, Linx Technologies (418 or 433 MHz version as appropriate)
K2 = 16-pin SIL connector, 0.1’’ pitch
K3 = 3-pin SIL connector, 0.1’’ pitch
LCD1 = 2x16 characters, DEM16217, Elektor Store #120061-71
X1 = 20 MHz quartz crystal
PCB #120049-13
Receiver
Resistors
R1 = not fitted
R2 = 10Ohm
R3,R5,R10 = 1kOhm
R4,R6 = 10kOhm
R7 = 330Ohm
R8, R9 = 180Ohm
P1 = 10kOhm multiturn preset
Capacitors
C1,C2,C3,C7,C8,C9 = 100 nF
C4 = 3.3uF 50V
C5,C6 = 10uF 25V
Semiconductors
D1 = LED, red, 5mm pitch
IC1 = LP2950-30LPR
IC2 = PIC16F628A-I/P
IC3 = RXM-315-LR, Linx Technologies (418 or 433 MHz version as appropriate)
T1,T2 = BC547B
Miscellaneous
ANT = ANT-315-PW-LP, Linx Technologies
K1 = 2-pin PCB screw terminal block, 5mm pitch
K2 = 16-pin SIL connector
K3 = 3-pin SIL connector
LCD1 = 2x16 character, DEM16217, Elektor #120061-71
X1 = quartz crystal, 20 MHz
PCB #120049-24
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