Battery Discharge Meter
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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
Sensor module
Resistors
R1 = 470Ω
R2 = 3kΩ09
R43 = 1kΩ
Capacitors
C1,C2 = 15pF ceramic, lead pitch 5mm
C3,C4 = 10nF ceramic, lead pitch 5mm
C5 = 100μF 25V radial, diameter 6.3mm
C6,C7, C10-C13 = 100nF ceramic, lead pitch 5mm
C8 = 10μF 25V, radial, lead pitch 2.5mm
C9 = 100nF ceramic, lead pitch 5mm
Semiconductors
D1 = LED, red
D2 = 1N4001
IC1 = PIC16F676-20I/P, programmed, Elektor
SHOP # 070821-41
IC2 = 7805
IC3 = ACS750SCA-050
IC4 = MAX232 (DIP16)
Miscellaneous
K1 = 6-way mini-DIN socket, PCB mount
K4,K5,K6 = spade terminal
2 M3 screws and nuts
F1 = miniature fuse, 1A, fast, for solder mounting
S1 = on/off switch
Mini DIN cable with moulded 6-way plugs for
connection of module
X1 = 20MHz quartz crystal, parallel resonance
PCB, ref. 070821-1, from www.thepcbshop.com
Display module
Resistors
R4,R5,R7,R9 = 2kΩ7
R6,R8 = 56Ω
R10 = 27kΩ
P1 = 10kΩ preset
Capacitors
C14 = 220μF 16V radial, lead pitch 2.5mm,
diameter 6.3mm
C15,C16,C17,C19-C22 = 100nF ceramic, lead pitch
5mm
C18 = 10μF 25V radial, lead pitch 2.5mm
C23,C24 = 15pF ceramic, lead pitch 5mm
Semiconductors
D3 = 1N4148
T1 = BC337
IC5 = 7805
IC6 = MAX232 (DIP16)
IC7 = PIC16F628-20/P, programmed, Elektor SHOP
# 070821-42
Miscellaneous
J1 = 2-way pinheader and jumper
S2 = pushbutton
K2 = 6-way mini-DIN socket, PCB mount
K3 = 6-way pinheader, lead pitch 2.54mm
LCD1 = LCD, 2x16 characters, e.g. EA DIP162
DNLED
X2 = 20MHz quartz crystal, parallel resonance
PCB, ref. 070821-2, from www.thepcbshop.com
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