I have been trying to use a zener diode and cannot get it to work as expected. I have been searching forums and watching youtube videos without any luck, so hoping someone can explain it to me
I want to use a Particle Electron to measure a 12v supply, the Electron accepts 0-3.3v so I am using a voltage decider which is working fine, I want to use a zener diode as over voltage protection to clamp it at 3.3v
I have purchased multiple packs of zener diodes (thought the first might be faulty/incorrect) but am currently using:
I am attempting to test the diode using the following tutorial on youtube: https://www.youtube.com/watch?v=WdDFI1IRQds
I have a 5.1v supply (measured at 4.98v using multimeter), a 1K ohm resister and the diode, when I measure the voltage I get 2.15v. I expected this to be 3.3v (as the zener voltage of the diode).
Can someone please explain why it is 2.15v? I have attached a photo of the circuit. Thanks for the help in understanding it.
Updated Diagram after changing the resistor based on feedback.