Greetings to all.
First post here so please be gentle in response .
Newby alert! (probably been done already)
While finishing the 18th lesson about photocells acting as a pot on LED’s, I was beginning to disassemble the various parts when something caught my eye.
It was a strange flicker of the LED’s. As I approached the board things were happening. I had removed the 1k resistor and photocell, but the rest of lesson 18 remained intact.
As my hand drew near the wire from A0 to the breadboard, the LED’s would react lighting up 0 to 3 or 4 depending on the proximity of my hand. Then used forefinger and thumb and lightly squeezed the wire and all 8 LEDs lit up quite nicely.
Now I must admit I do not understand what is causing this other than the fact that an electrical field is generated in the A0 wire and that my hand is producing a triggering resistance of some sort similar to a photocell. This only seems to work with the A0 wire and nothing else.
If anyone has an explanation I would like to hear it. Onward to #19!