Como hacer un probador de sensor ABS de efecto Hall

ABS SENSOR TESTER OF HALL EFFECT OF TWO CABLES

Today I bring you this great tester, by virtue of the large number of questions I have had about failures associated with ABS. It is a super simple circuit to do since there are only 6 materials to buy or get and it will save you a lot of money in discarding sensors that "apparently were damaged". These sensors are somewhat confusing because they use their power to transmit the measurement signal, reducing the amount of cable to use, which in this case is one. Then it is very rare to see a HALL with only two wires and it is confused with an inductive one.

What do we need to build this tester:

 - 01 Yellow LED (or your favorite color).

 - 01 380 ohms resistor (R2)

 - 01 660 ohms resistor (R1)

 - 01 9V batteries or a 9VDC or greater charger (up to 15V).

 - Caimans for circuit connection.

Publicidad.

Circuit for assembly

As you can see in the previous image, the circuit has few elements, perhaps the simplest I have done so far. Hehehe The important thing in this assembly is that the positive of the led must be connected to the resistance R1 and the negative to the resistor R2. If you invert the positions the circuit will not work correctly.

How does the circuit work?

 In the circuit of the following figure you can see the circulation of two currents, I1 and I2:

When the ABS HALL sensor is installed correctly, it will light up. And let only its minimum ignition current that is approximately 10mA circulate. This current that flows through the Hall will be called I2.

 The I1, is the current that circulates through the led diode and resistance R2.

 The R1 limits the current flow for both the LED and for the HALL sensor, thus forcing the total current to be shared between both systems.

 So, its operation is quite simple. When there is no metal in the HALL sensor, it is at rest, so its consumption current will be low. In this way the total current goes practically all towards the LED and R2. (It looks well lit).

 But when a metal element is placed in front of the Hall sensor, it activates and increases its power consumption up to 18mA. Then the current looks for the place with less resistance than for this case is the Hall sensor and almost all the total current will circulate through the Hall and not by the LED and R2. (LED will light little)

 Then in this way we will know when the Sensor turns on and activates just by seeing the degree of luminosity of the LED.

How to use?

As always, I try to do it as simple as it is easy to understand and use.

 First of all, feed the circuit to turn on the led.

 Then connect the ABS HALL sensor. You will see a slight decrease in luminosity. This tells you that the sensor is working. If the LED goes off or there is no decrease in brightness the sensor is damaged or connected inverted. Do not worry if you connect it, on the contrary, all the sensors of the cars are protected and do not burn for this.

 Then weigh something metallic in front of the sensor, you should notice that the LED goes off a little more when it makes this movement. If it does not, the sensor is defective.

Design considerations:

 Make sure the supply voltage is greater than or equal to 9VDC when the circuit is running. The Hall needs more than 7V to turn on.

 Connect the components correctly as indicated in the figure to achieve the desired effect.

 Well, it's all for today, I hope you like it and can implement it.

 Here is a video of how I did it.

Write your opinion and give me 5 stars if you like it. hehehe Up at the beginning of the article.

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Written by:

Dennis García

30/05/2018