Using different sensors wiring

[profbit]

Good day guys, I'm not quite good in wiring electronics and I can say that I'm just started learning stuff. I would like to ask for a help on how do I power up (best way too if possible) the sensors listed below for checking its state on rpi python. I don't want my pi to break (ofc) thats why.

Here's the list of my sensors:
1x Inductive Sensors: https://www.amazon.com/LJ12A3-4-Z-Appro ... B0719D9FGC
1x Capacitive Sensors: https://www.amazon.com/Capacitance-Prox ... B01G6PBB1E
5x Ultrasonic Sensors: https://www.sparkfun.com/products/15569

It would be a big help if you can show me a diagram.
Thanks for your time!

[B.Goode]

For the last, the use of an HC-SR04 ultrasonic sensor is documented by Raspberry Pi themselves in a tutorial on the web domain that also hosts these forums: https://projects.raspberrypi.org/en/pro ... -computing

[pcmanbob]

A quick look at the 2 proximity sensors show they work at a minimum of 6V and a max of 36V and have a pnp output.

So that suggests a 6V to 36V output which you can't connect directly to the pi gpio or you will kill your pi.

So you will need a potential divider circuit designed to reduce the output to 3.3V.
Or better still an opto isolator circuit to isolate the higher voltage from the gpio.

[profbit]

A quick look at the 2 proximity sensors show they work at a minimum of 6V and a max of 36V and have a pnp output.

So that suggests a 6V to 36V output which you can't connect directly to the pi gpio or you will kill your pi.

So you will need a potential divider circuit designed to reduce the output to 3.3V.
Or better still an opto isolator circuit to isolate the higher voltage from the gpio.

Hello, I'm interested to this one, however I'm not familiar with the opto isolator (on how it works) even after I've done some searching, it just get things complicated for me as a beginner. Can a resistor function as a voltage divider? I hope you can provide me an example on how it works.

[B.Goode]

Can a resistor function as a voltage divider? I hope you can provide me an example on how it works.

No, a single resistor cannot usefully function as a voltage divider.

The initial paragraph of the Wikipedia article seemed accurate at the time of retrieval: https://en.m.wikipedia.org/wiki/Voltage_divider


(There is nothing Raspberry Pi specific about this. It is simply an application of Ohm's Law.)

[pcmanbob]

These are examples of how to use both a potential divider circuit and an opto isolator to connect the sensor to your pi.

I would consider the opto isolator circuit the better option especially if you are going to be using a sensor voltage nearer the 36V maximum.



You would need to calculate the values of R1 and R2 for the potential divider circuit depending on what voltage the sensor is being powered from while keeping the current drawn within the limits of the sensor output.

You would need to calculate the value of RL in the opto isolator circuit again dependent upon the voltage the sensor is being powered from while keeping the current down to 8-10MA

edit to correct diagram

[profbit]

These are examples of how to use both a potential divider circuit and an opto isolator to connect the sensor to your pi.

I would consider the opto isolator circuit the better option especially if you are going to be using a sensor voltage nearer the 36V maximum.



You would need to calculate the values of R1 and R2 for the potential divider circuit depending on what voltage the sensor is being powered from while keeping the current drawn within the limits of the sensor output.

You would need to calculate the value of RL in the opto isolator circuit again dependent upon the voltage the sensor is being powered from while keeping the current down to 8-10MA

If I'm supplying 4x Ultrasonic sensor, 1x inductive proxi, and 1x capactivie proximity sensor with a single power supply. How will the opto isolator wiring will be?

[boyoh]

These are examples of how to use both a potential divider circuit and an opto isolator to connect the sensor to your pi.

I would consider the opto isolator circuit the better option especially if you are going to be using a sensor voltage nearer the 36V maximum.



You would need to calculate the values of R1 and R2 for the potential divider circuit depending on what voltage the sensor is being powered from while keeping the current drawn within the limits of the sensor output.

You would need to calculate the value of RL in the opto isolator circuit again dependent upon the voltage the sensor is being powered from while keeping the current down to 8-10MA
[/qu

From BoyOh I might be right or I might be wrong You show the 3.3v connected to the Opto transistor Base connection
Should It have been connected to the Opto transistor Collector connection
If I'm wrong please except my apology Regards BoyOh

[pcmanbob]

From BoyOh I might be right or I might be wrong You show the 3.3v connected to the Opto transistor Base connection
Should It have been connected to the Opto transistor Collector connection
If I'm wrong please except my apology Regards BoyOh

Well spotted, just goes to show I am human

I have posted corrected diagram in original post and repeating it here

[pcmanbob]

If I'm supplying 4x Ultrasonic sensor, 1x inductive proxi, and 1x capactivie proximity sensor with a single power supply. How will the opto isolator wiring will be?

For the ultrasonic sensors just follow the examples on line and use a potential divider circuit for each one.

For the proximity sensors you would need one opto isolator circuit for each one.

and please note corrected opto isolator circuit.

[profbit]

If I'm supplying 4x Ultrasonic sensor, 1x inductive proxi, and 1x capactivie proximity sensor with a single power supply. How will the opto isolator wiring will be?

For the ultrasonic sensors just follow the examples on line and use a potential divider circuit for each one.

For the proximity sensors you would need one opto isolator circuit for each one.

and please note corrected opto isolator circuit.

Can you recommend me a good opto isolator circuit available on the market?

[pcmanbob]

You can use any of the 4N2x or 4N3x range of opto isolators, just about any opto isolator would be ok as you are only using low voltage and minimal current ,

you will have to assemble the opto isolator and resistors on to a prototyping PCB or just some ordinary strip board as you will need to use specific resistors to match the circuit to the voltage used to power the sensors, so ready made ones are unlikely to meet the requirements.