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Topic: make pwm output non linear (Read 3316 times) previous topic - next topic

Grumpy_Mike

Quote
I don't think there's any with more than 8-bit PWM resolution.

Yes there are:-
The TLC series for a start, TCL5940 the old favorite and then there is the easier to use TCL5945 and TCL5947 these are 12 bit PWM with an SPI like interface and constant current outputs.

The PCA9685 is also a 12 bit PWM but with an I2C interface, it has not got constant current output so you either need to include a resistor in line with the LED.

Headroom

Thsi board available from Adafruit https://www.adafruit.com/products/815 employs the  PCA9685
.
Or get something similar (I guess ) therough Grumpy Mike:
http://arduino.cc/forum/index.php?topic=64046.0
http://trippylighting.com

http://ledshield.wordpress.com/

fungus


Quote
I don't think there's any with more than 8-bit PWM resolution.

Yes there are:-
The TLC series for a start, TCL5940 the old favorite and then there is the easier to use TCL5945 and TCL5947 these are 12 bit PWM with an SPI like interface and constant current outputs.


Yes, of course....but they're not really "similar to the ws2801". The amount of wire you'd need to make a long string of RGB LEDs using TLC5940s is ridiculous.
No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

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