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Triac (bt136) need nearly .7 v ,9ma at its gate terminal so u can use a transistor as a common base configuration and connect triac at emitter,AT collector connect 1k variable resistance and base under 10k resistance at pic16f54 terminal
Hi,
Assuming you're using an MOC3021 or something similar, when you set PWM duty cycle (the traditional DC-DC controlling PWM) at 20%, the output is high for the first 2ms and low for 8ms. But as soon as the output goes high, the MOC3021 fires the triac, which gets latched (on) until the next zero crossing.
Take any duty cycle and you'll see that the lamp will always light upto full brightness.
What you have to do is, if you need 20% brightness:
Half period is 10ms. So, your output needs to be on for 20% first half, then 20% second half. So, that means 80% off, this 80% is "cut" through phase control. Wait for 80% of the half-time, ie, 8ms and THEN send a high pulse to the MOC for about 100us and then turn the pulse low. Repeat this for the second half as well, and THEN you will get 20% brightness.
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