MIBAM and 12F1822...

[Darrel Taylor]

Ok, here's the modification of MIBAM for use with 16F1's.
It also works with 14-bit cores (12F, 16F) and 18F's.

I've tested it on 16F1827, 16F1947, 16F877A and 18F4550.
Sorry, I don't have a 12F1822.

One problem I spent a lot of time trying to figure out ended up being caused by the statements ...

T1CON.0 = 0 'disable mibam
T1CON.0 = 1 'enable mibam

I really thought that would work to stop interrupts from occuring during the DEBUG statements.
But it turns out that 1 interrupt can still happen after you stop the timer.
I have yet to understand how that happens, but it does.

If you use these statements instead ...

GIE = 0 'disable mibam
GIE = 1 'enable mibam

then no further interrupts occur to disturb the DEBUG's.
They are actions of the chips themselves, not MIBAM.

MIBAM seems stable at this point, but let me know if you have any problems.

[alesniak]

fantastic! thank you again... going to give this a try this evening and report back. (day job and stuff..)

question: is it going to be possible to use the hardware uart while mibam is running? eventually would like be able to receive serial commands, rgb data
to control led color.

[Darrel Taylor]

Sure, the USART will work fine with MIBAM.
Then you don't need to disable interrupts.

I don't think you can have the POT connected, since the USART will use 2 pins and the LED's use 3 pins.
There won't be an analog pin left. But since the serial data controls the LED's, you probably don't need the POT anymore.

[alesniak]

update: finally got time to test the new MIBAM with the 12F1822 and works like a charm!! good stuff.
So.... to make a more "proper" test I figured I'd whip up a little project to give a better demo, so did a quick and dirty pcb design threw in a few components, and presto a uber quick, interactive light module, (always wanted a interactive tabletop)

here's a super rough video showing it all in action...



I'm going to take a few days to clean up the code/pcb gerbers and post them
here if anyone wants to build a fun blinky toy...

[Darrel Taylor]

Ooooo, very cool!
That's the neatest use of MIBAM I've seen so far.

Thanks for the video. I think my counter top needs a makeover. (if I wasn't renting)

[Bruce]

Yup. Very cool. Are you using the LEDs to sense changes, then flipping them to outputs, or using sensors?

[alesniak]

the circuit is just a phototransistor and a resistor for the detector, I added a IR led next to it as well so it works in the dark. I sample the ADC every few ms and calculate the difference from previous/last sample, to get a delta value, and just trigger some flahsy lights if the delta exceeds the threshold value, which controls how sensitive the trigger is.

I now have 1 pin left to do something with (I used it for debug output to see what my adc output was, thinking of using it to trigger adjacent modules perhaps, to create a cascading effect perhaps)

funny didn't intend to build this earlier, but it's kinda fun, so I'll just keep going with it and see what I can get this tiny pic to do..

and the 12f1822 is dirt cheap so perhaps I'll build a few dozen at least and
see how it goes.