Sensors - Photocell

In this video we will be looking at a general photocell you can pick up from your local electronics store. I will be showing a hardware only schematic of how to use this device.
My ADC Video link
• LESSON 15 ADC PART1

[@beehive808]

Great Video, but I don't think you need R2 1M when you have R1 3.16k. When you have 2 resistors in parallel, the total resistance will be lower than the small of the 2 resistors. Keep putting the videos, I really like to watch them

[@misperry]

Hey there, thanks for your comment. This is funny I am so use to putting the "bleeding" resistor there I just didn't take the time to notice that the 3.16k would provide that for me any way. lol thanks for catching that. Cheers.

[@nerdyneddy7887]

As far as I know a relay is NOT polarised. The current through the coil attracts a soft iron core which cannot be permanently magnetised, because it is soft iron reminiscent of a ferrite core. A relay will not push the actuator away, the actuator is spring loaded. cheers

[@misperry]

Hello there thank you for your comment. I think there is some confusion. When I am talking about swapping polarity and movement changing, I am refering to the linear actuator that the "relay" controls. This is in reference to the demo video about relays located here: Demo Time - Relays When you change the polarity on the actuator it will move either out 4" or in 4". This was what I was talking about. However, your description of how the coil of a relay works is exactly right and I am glad that you took the time to mention it. Yes a "relay" coil is not polorized since it has a solenoidal action on the core. There is just a peice of spring loaded "soft Iron" core, as you mentioned, in a solenoidal coil and when the coil is energised it aligns the "soft iron" core to the B filed generated inside the solenoid. Thank you for this information and I apologize for the confusion.