Hi all,

I have a Keyence brand pressure sensor I am looking to connect to a GPIO input on my Raspberry Pi. The wiring diagram that Keyence gives says it uses 10-30VDC. I do have 24VDC power in my control box. What would be the best way to interface a GPIO input and this device? I attached the page of the Keyence pdf.

 

hi n66,
Use the NPN open collector option, say a 4k7 pull up to 5Vcc supply of the RPi.
E

Update:
If you prefer an Analog output option, select the 4-20mA, use a 250R load resistor, Voltage range +1V thru +5V.

 

The RPi doesn't have any analogue inputs. How will you read an analogue voltage or current?

 

@Alec_t Oh I didn't explain enough. The sensor has a digital display so I am simply looking to read a signal that is just ON/OFF if the sensor has exceeded a setpoint. I guess that would be the "control output" on the datasheet.

 

ON/OFF if the sensor has exceeded a setpoint.

Use the analog output as ericgibbs described and connect that to a comparator circuit calibrated to the "set point".
SG

 

Huh I'm definitely trying to read the control output, not use analog output at all.

Use the NPN open collector option, say a 4k7 pull up to 5Vcc supply of the RPi.

The Pi GPIO pins are 3.3V so you meant 4.7k pullup to 3.3V right?

 

The Pi GPIO pins are 3.3V so you meant 4.7k pullup to 3.3V right?

Hi nano,
Correct, use whatever the Pi is using on its power rails, in your case +3.3V.
E