- on Hobby & Modelling
- Published in issue 1/2012 on page 16
Wideband Lambda Probe Interface (1)
Part 1: Test exhaust oxygen levels
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
* Suitable for wide range of Lambda values.
* Digital output with RS232 interface.
* Output of lambda value and operational status.
* Fault evaluation via diagnostics register.
* Analogue output 0 to 4 V.
* Automatic calibration.
R8 = 62Ohm (SMD1206)
R10* = 82.5Ohm (SMD1206)
R2 = 100Ohm (SMD0603)
R18,R19 = 470Ohm (SMD0603)
R9,R15,R16,R20 = 1kOhm (SMD0603)
R21,R7 = 4.7kOhm (SMD0603)
R17 = 6.8kOhm (SMD0603)
R1,R3*,R6,R11,R12,R13,R24 = 10kOhm (SMD0603)
R22,R23 = 39kOhm (SMD0603)
R5,R14 = 100kOhm (SMD0603)
R4 = 470kOhm (SMD0603)
R3 = 31.6kOhm (SMD0603)
R10 = 300Ohm (SMD1206)
C7,C8 = 22pF (SMD0603)
C16,C18,C19,C21,C22,C23,C24,C25,C26 = 100nF (SMD0603)
C20 = 10?F 35V (Panasonic B)
C5,C17 = 220?F 35V (Panasonic F)
L1,L2 = 47?H (SMD1210)
D1 = SM6T30CA (SMB)
D2 = MBRS320 (SMC)
D4 = MURS120 (SMB)
D6 = 1N4148 (Minimelf)
LED1 = LED, red (SMD0805)
LED2 = LED, green (SMD0805)
Q2 = IRLU024N (TO251)
IC1 = Atmega8-16TQ (Atmel), programmed, Elektor #110363-41
IC2 = CJ125 (Bosch)
IC3 = 7805
IC4 = LM4041 (SOT23)
IC5 = LMV321 (SC70)
IC6 = SP3232EB (TSSOP16)
Fuse, 4A (Schurter type OMT 125 4.0A)
Fuse, 500mA (Schurter type OMT 125 0.5A)
Q1 = 14.7456MHz quartz crystal (HC49-SMD)
X1,X2,X4 = 3-way PCB terminal block, 3.5mm pitch (AKL059-03)
X3 = 8-way PCB terminal block, 3.5mm pitch (AKL059-08)