Hello ALL,

I'm trying to work on a new design but i have to work with sensor but didn't find any application note or something to help work with it;
i'm working with an I2C expander with 24 GPIO and i don't know how to connect this sensor to my expander ?
Do i need to use a transistor?
Thank you so much for your help

 

Hi,
Have you seen this video.?
E

 

Hi,
Have you seen this video.?
E

Hi
I just watched it, i'm not sure it is the same sensor because mine :

the contact form is working as a relay if i understand correctly?

 

hi,
It helps if you post the datasheet.

The MP2 Series sensors are reed position sensors. Normally open or closed contacts change states when a magnetic field is
applied. The sensors act as non-latching electrical switches.

E

Update:
Post a simple description of the project.

 

hi,
It helps if you post the datasheet.

The MP2 Series sensors are reed position sensors. Normally open or closed contacts change states when a magnetic field is
applied. The sensors act as non-latching electrical switches.

E

Update:
Post a simple description of the project.

Yes that is true, i should have post the datasheet
the issue with this datasheet is that there not enough information on how to connect the sensor to something, i dont know if it is a 3wire or just 2 for example

 

hi A91,
You can create a logic High or Low signal, using the Local Vdd and 0V, use a 4k7 Resistor , do you know how to do that.?
E



Update:
i'm working with an I2C expander with 24 GPIO and i don't know how to connect this sensor to my expander

What is GPIO type number.?

 

hi A91,
You can create a logic High or Low signal, using the Local Vdd and 0V, use a 4k7 Resistor , do you know how to do that.?
E
View attachment 217676


Update:
i'm working with an I2C expander with 24 GPIO and i don't know how to connect this sensor to my expander

What is GPIO type number.?

No i don't

 

No i don't

the Expander is the PCAL6524 : https://www.nxp.com/docs/en/data-sheet/PCAL6524.pdf

 

hi,
Look at this simple sketch, options
A LOW on switch Close and the other HIGH on switch Close

 

hi,
Look at this simple sketch, options
A High on switch Close and the other Open

Oh thank you so much
the switch represent the sensor or i need to have a switch on my design?

 

hi,
The Sensor is a Switch , it is Normally Open until a magnet is placed close to the sensor, then it Closes.

E

 

hi,
The Sensor is a Switch , it is Normally Open until a magnet is placed close to the sensor, then it Closes.

E

Ah oky , i tough it was more complicated then that
thank you so much for your help
i just need to connect one wire to a Vdd through a resistor and the other wire to my GPIO if i understand correctly

 

hi
Please post a sketch showing how you intend to connect it, your description sounds incorrect.??

E

 

What do u think of this sketch?

 

What do u think of this sketch?

this is how i intend to connect it

 

hi,
Looks OK,
When the switch Closes, the input to the GPIO will go Low, is that what you want.?
E

 

hi,
Looks OK,
When the switch Closes, the input to the GPIO will go Low, is that what you want.?
E

Yes but i supposed if i wanted the input of the GPIO to go High when the switch is closed i need to put the resistor on the ground side ?

 

hi,
Yes swap over the Sw and Resistor.

What function in the project does the operation of the Switch enable.?
E

 

hi,
Yes swap over the Sw and Resistor.

What function in the project does the operation of the Switch enable.?
E

it's to make sure that the door is closed

 

hi,
I would suggest a High when the Door is closed, just in case the connections or wiring become open circuit.

E