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Thanks I just viewed the video feed Steve provided and that demonstration answers my question. I may need further help with my project but for the moment I am ok. Many thanks for replies, very helpful.CdS cells often get a bad rap for being slow, taking a long time to reach their dark value again after being exposed to light. However, this does not mean your circuit will take that long to change state. Typically you are looking for a change in resistance that happens quite quickly (in human terms). Even though (say) 30ms is a long time in electronics, it happens (literally) in the blink of an eye.
What are you actually trying to do? Do you need to react millions of times per second, thousands of times per second, or every second (or more)?
If you google "photodiode switch" you will find a number of circuits. The simplest require one or two transistors.
Here is a page describing methods of using a number of different sensors. You may find that the photodiode is relatively insensitive.
For what you're describing it will require a microcontroller or far more circuitry than any of those simple examples.Could this this circuit be modified to switch on 4 LED's in turn restarting at the first LED when the LDR cycles between DARK and LIGHT continuously ?
Are you looking to have all four LEDs cycle.. or simply have them gradually turn on one after the other between Light and Dark?Could this this circuit be modified to switch on 4 LED's in turn restarting at the first LED when the LDR cycles between DARK and LIGHT continuously ?
Are you looking to have all four LEDs cycle.. or simply have them gradually turn on one after the other between Light and Dark?
If you want the LEDs to gradually turn on, you could certainly modify the circuit to do so.. it would require more components of course
CdS cells often get a bad rap for being slow, taking a long time to reach their dark value again after being exposed to light. However, this does not mean your circuit will take that long to change state. Typically you are looking for a change in resistance that happens quite quickly (in human terms). Even though (say) 30ms is a long time in electronics, it happens (literally) in the blink of an eye.
uC = MicrocontrollerHi Chris
Yes, this had occurred to me also and I arrived at the same solution, which although not ideal I think a feature that made the first domino immovable is necessary.
As I have been out of electronics for many many years some of the terminology/abreviations are not understood I am afraid i.e. uC and RC. I must also add that I have never designed an electronic circuit in my life but do have a cursory knowledge of components but there were no IC chips when I was at college so please bear this in mind when replying.
I see how the IC chip 4017 could be used
uC = Microcontroller
RC = Refers to a Resistor / Capacitor combination commonly used to introduce delay (ie. an RC Time constant)
The game of fives and threes consists of 4 players so one LED for each player is required.
Each game consists of playing until 91 points are accrued at which time a new game starts and a new player is chosen to start so that players LED would need to be manually set in addition to him placing his domino on the LDR.
Yes that is correct.OK, I need some clarification. Are you saying that out of 4 players it may be any player 1 through 4 that starts the new game? Example: If player 3 starts the game LED 3 needs to be manually lit to initialize the count?
Chris
Sorry to here about your mishap Chris, thanks for the update and please take all the time you need to look after your wife. She is more important than the circuit.Hi Nala and sorry for the wait. Soon after my last post my wife and I were cycling to a dentist appointment when she was sideswiped by a hit and run driver. No broken bones were incurred but she did suffer some serious road rash. Actually, "road-rash" is an inadequate adjective for what she left behind on the asphalt. On my end I haven't been able to think about much that didn't involve forward and rear firing machine guns, sidewinder missiles, grenade launchers and the like.
OK, now that I got that off my chest I will be posting a schematic within the next day or two.
Chris