Wiring 24v NPN Proximity Switch to 5v BOB - Why does'nt it work

[Robin Hewitt]

Inside the sensor is a 10K resistor between the supply and output. AT 24v supply it means that it will source 2.4mA at that voltage.

Sort of, if you short out a 24 Volt PSU with a 10k resistor it will flow 2.4mA

If you stick anything between the resistor and ground you are unlikely to get 2.4mA

Ohms' Law gives you the Voltage drop across the resistance.

[cropwell]

Ohms' Law gives you the Voltage drop across the resistance.

Potentially, I am divided on this. There's no place like Ohm.

[Clive S]

Potentially, I am divided on this. There's no place like Ohm.

Excellent