Best way to power 'Tiered' LED's?
As part of a larger project, I need to drive a module (lcd display) with 3 common cathode LED's (only one being on at a time). Whenever any of the three is on, another set of 4 parallel LED's will also be lit.
This uses 3 pins on the stamp and each pin has a high sided pnp to drive the 100ma of LED's. I'd appreciate the groups feedback on this. Is their a reasonable, better, more robust way of doing this? Ideally, without drastically increasing the complexity.
Here is the circuit:
VBIRC - LED Driver Subsystem - v1.2.pdf
Here is an online simulator of the circuit.
http://tinyurl.com/k4a7e7o
Note: The falstad.com simulator uses java and the window will likely need to be enlarged/maximized.
Thanks!
Version:
1.2 - added a resistor for each discrete LED
1.1 - VBIRC - LED Driver Subsystem - v1.1.pdf
This uses 3 pins on the stamp and each pin has a high sided pnp to drive the 100ma of LED's. I'd appreciate the groups feedback on this. Is their a reasonable, better, more robust way of doing this? Ideally, without drastically increasing the complexity.
Here is the circuit:
VBIRC - LED Driver Subsystem - v1.2.pdf
Here is an online simulator of the circuit.
http://tinyurl.com/k4a7e7o
Note: The falstad.com simulator uses java and the window will likely need to be enlarged/maximized.
Thanks!
Version:
1.2 - added a resistor for each discrete LED
1.1 - VBIRC - LED Driver Subsystem - v1.1.pdf
Comments
-Phil
Thank you for the note Phil, I updated the drawings and the original post.