PWM output on a -08M
- Thread starter PIK-E
- Start date
radiogareth
Senior Member
Excellent tip - thanks! Clearly need to read the latest manual!!
Gareth
Gareth
hippy
Ex-Staff (retired)
Another trick to try is to add "SETFREQ M8" at the start of the program, that may also help.
It would be interesting to see if it's flicker inherent in the hardware-software combo or a result of unstable pot readings re-activating PWMOUT too frequently. If you replace the READADC 4,b0 with b0=x where x is a number when flicker occurs, does flicker stop ? If so it's probably unstable pot readings and re-activating PWMOUT.
A simple cap on the ADC won't necessarily stabilise ADC completely as there will always be a point where any voltage read by READADC can jitter +/-1 as that's the nature of hardware but it is possible to filter that with software.
radiogareth
Senior Member
Thanks to all the suggestions, it is really not a problem now and the final nail was setting the speed to M8 - It works fine like that.
The next idea (prompted this afternoon by a pupil asking if he could use touch control) was to try something I used back in 1998 (ish). Using a 4M7 resistor as the input pin pull-up and a couple of touch pads as the push to make switch (your finger). Bingo! It works. Now to rewrite the code to dim up/down on the (touch) pushbuttons
The only thing missing is wake up from sleep on port change, but I'd have to revert to mpasm to do that, and I can't remember how!!
Gareth
The next idea (prompted this afternoon by a pupil asking if he could use touch control) was to try something I used back in 1998 (ish). Using a 4M7 resistor as the input pin pull-up and a couple of touch pads as the push to make switch (your finger). Bingo! It works. Now to rewrite the code to dim up/down on the (touch) pushbuttons
The only thing missing is wake up from sleep on port change, but I'd have to revert to mpasm to do that, and I can't remember how!!
Gareth
radiogareth
Senior Member
Final code as follows, with bottom end shut off as suggested, at least until it changes again ;-)
setfreq m8
Do
ReadAdc 4, b0
If b0 <> b1 Then
b1 = b0 min 2
if b1=2 then
b1=0
end if
PwmOut 2, 63, b1
End If
Loop
setfreq m8
Do
ReadAdc 4, b0
If b0 <> b1 Then
b1 = b0 min 2
if b1=2 then
b1=0
end if
PwmOut 2, 63, b1
End If
Loop
radiogareth
Senior Member
Over the weekend I've been thinking how I can add to the functionality of this little project. Many years ago I had a mains powered touch dimmer that responded to the duration of the touch to either turn off, turn on, (change state) dim up or dim down (change direction). It also remembered where you 'left' it brilliance wise.
Anyone any ideas for implementing this on input 3 alone, with a single push button? It's the change direction bit I'm stuck on, and the dim up/down, and remember last level - OK, everything!!
Thanks
Gareth
Anyone any ideas for implementing this on input 3 alone, with a single push button? It's the change direction bit I'm stuck on, and the dim up/down, and remember last level - OK, everything!!
Thanks
Gareth
radiogareth
Senior Member
" Tis in vain to do with more, that which can be done with less"
William of Occam 1300-1349
Gareth
William of Occam 1300-1349
Gareth
Unfortunately, that doesn't cut it. ;-)" Tis in vain to do with more, that which can be done with less"
William of Occam 1300-1349
Gareth
It's been a week and no progress I assume?
An 18M2 and a few minutes coding could have sorted it.
e
radiogareth
Senior Member
The hardware is fine, it's implementing the store function and actually planning the code structure I have yet to even think about - other work keeps getting in the way.
One day though, one day....
Gareth
One day though, one day....
Gareth