How to make an oxygen sensor or Lambda probe 5w241r

How to make an oxygen sensor or Lambda probe tester. 5k3258

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Today this time I bring you an oxygen sensor tester. This is because I have seen online that many test this sensor using the multimeter, but you have to have expertise to know how to take the readings well, because of the issue of the average of the measurement made by the digital instrument. I explained that in a YouTube video.

This is why I designed this simple device that gives us a clear vision of what the oxygen sensor really does, something like an O2 wideband.

Electronic Scheme 3s376s

Below the diagram so they can build the oxygen sensor tester.

Down the circuit mounted on a protoboard.

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Material's list: 5i186s

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1 Capacitors
Quantity References Value
     1            C1        10uF x 16V

5 Resistors
Quantity References Value
     4          R1-R4      10k x 1/4W
     1          R5           390R x 1/4W
     4          R6-R9      390R x 1/4W

2 Integrated Circuits
Quantity References Value
     1            U1        LM324
     1            U2         7805

5 Diodes
Quantity References Value
5 D1-D5 LED-RED

1 Potenciometer
Quantity References Value
1 RV2 Potenciometro de 10k

In this case, what I did was to use the LM324, which is an integrated circuit that has 4 operational amplifiers, and I placed them in a voltage buyer arrangement.

So in order to make a correct measurement, we need a reference voltage of 1V, how do we get it? For that it is the stable 5V regulator LM7805 and the potentiometer RV1. With the 7805 we get about 5VDC stable for the whole system, and with RV 1 we adjust to reduce these 5VDC to approximately 0.9VDC.

In order to calibrate the potentiometer RV1 we need the digital multimeter and measure its central output with respect to negative.

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Device Operation 133p6p

Below, you can see a small diagram of how to operate an operational amplifier as a voltage buyer.

In this case, it is simple, the 5V regulator (U2-7805) is placed. Once we have stable voltage throughout the system, we proceed to adjust the reference voltage by moving to RV1.

So then:

We adjust RV1, so that 2V on leg 3 of the integrated (input + of the Operational Amplifier).

If the voltage in Vc (leg (2) (-) of the operational amplifier) ​​is less than 2V, the amplifier through leg 1 will be positive. The led will not turn on.

If the voltage in Vc (leg (2) (-) of the operational amplifier) ​​is greater than 2V, the amplifier through leg 1 will be negative. The led will turn on.

So as you can see, the logic is simple, and what needs to be done is to cascade them with equal resistors to divide the reference voltage RV1 into equal parts. In this case divide the reference voltage by 4.

It is possible to put more amplifiers in cascade, but as an example I did this. The more there is the better the measurement resolution of the device and the better the behavior of the oxygen sensor signal.

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How use device 5o2f70

Connect the circuit power to the 12V battery.

Connect the VO2 measuring cable to the output terminal of the oxygen sensor.

Wait for the oxygen sensor to pick up temperature so you can start working and see the readings.

to adjust the reference voltage, otherwise you will measure strange things or you will not see anything.


Here I show you a video where I assemble both circuits and the final recommendations.

Well, that's all for now, I hope you like it.

Do you have questions or concerns?? 1n1s4r

Questions or suggestions can use the form below and I will gladly answer them.

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Escrito por Dennis García. v6y58

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