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I want to control the brightness of 1W LED using the #4 circuit with PWM input from FPGA whose I/O pins work with 3.3V. As told in #4 circuit, I configured the output pin as "open drain". Still I am unable to get the desired results, LED stays at a constant brightness. It's brightness doesn't seem to vary with the variable duty cycle. I tried to mount the circuit on breadboard of which a picture is attached here. The right most circuit is #4 circuit.I am in urgent need :,(. Pls help with this. Pls let me know where I am making mistakes.Quick reply will be highly appreciable.Thank you in advance!!
sir, can this digital light sensor module be interfaced to fpga to sense the indoor i'light intensity and adjust the LED brightness???
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