Hi everyone, I recently got an idea for project for a friend's child, but Im afraid I'm a bit out of my depth. The project is based on this one here: http://www.instructables.com/id/Childs-Toy-Light-Switch-Box/
What I wanted to do is do something similar, but turn it into a baseball scoreboard that would have 7 switches and 7 LEDs for tracking Balls, Strikes, and Outs (3 Green, 4 Red).
These are the Red LEDs I wanted to use: https://www.sparkfun.com/products/10632
These are the Green LEDs I wanted to use: https://www.sparkfun.com/products/10633
The plan was to have 1 main battery power source and 7 sets of Switch/LED/Resistor wired in parallel. However, I am having trouble figuring out exactly what power source and resistors to use.
My thought was to use 4 AA batteries, but would that be sufficient (as a rough goal I was looking for about 4 hour run time if all 7 LEDs were on, but I'm not sure how practical that is)? Since parallel circuits drain a lot more power, do I need to have 1 battery per Switch/LED/Resistor or can I use a single power source? Should I be using a 9 volt battery instead of AAs?
The other problem I was having was figuring out what resistors to use. All the resistor calculators I have found don't seem to accommodate what I want to do as they don't allow to for multiple color LEDs or the fact that anywhere from 1 to 7 LEDs might be on at the same time. How would I do the calculation taking those parameters into account?
Finally, as this will all be housed in an enclosed wooden box, do I need to be worried about the heat it produces and put in some vent holes?
Any help you could provide would be greatly appreciated.
What I wanted to do is do something similar, but turn it into a baseball scoreboard that would have 7 switches and 7 LEDs for tracking Balls, Strikes, and Outs (3 Green, 4 Red).
These are the Red LEDs I wanted to use: https://www.sparkfun.com/products/10632
These are the Green LEDs I wanted to use: https://www.sparkfun.com/products/10633
The plan was to have 1 main battery power source and 7 sets of Switch/LED/Resistor wired in parallel. However, I am having trouble figuring out exactly what power source and resistors to use.
My thought was to use 4 AA batteries, but would that be sufficient (as a rough goal I was looking for about 4 hour run time if all 7 LEDs were on, but I'm not sure how practical that is)? Since parallel circuits drain a lot more power, do I need to have 1 battery per Switch/LED/Resistor or can I use a single power source? Should I be using a 9 volt battery instead of AAs?
The other problem I was having was figuring out what resistors to use. All the resistor calculators I have found don't seem to accommodate what I want to do as they don't allow to for multiple color LEDs or the fact that anywhere from 1 to 7 LEDs might be on at the same time. How would I do the calculation taking those parameters into account?
Finally, as this will all be housed in an enclosed wooden box, do I need to be worried about the heat it produces and put in some vent holes?
Any help you could provide would be greatly appreciated.