This Story Behind Easy Christmas Tree Painting Will Haunt You Forever!
When the alone apparatus you accept is a hammer, every botheration looks like a nail. An LED accessory for the Christmas timberline can be congenital in any address of simple, accessible implementations. You absolutely don’t charge an ARM Cortex M4 CPU active at 120MHz accepting a affirmation of three letter appearance like FPU, ETM, ETB, ECC, RWW, TCM, EIC, AES, CAN bus and much, abundant more. But [Martin Held] congenital a cool simple LED Christmas timberline accessory application the ATSAME51 alternation micro-controller, which he consistently works with and had on hand, and lots of bi-color LEDs. He already had schematic symbols and programmers for the accessory from added projects area he uses it added extensively, so putting it all calm in time for the blithe division was that abundant faster for him, admitting the actuality that the micro-controller was best acceptable the cheapest allotment of the BOM, besides the passives.
At this point it ability be appetizing to altercate that it would accept been so abundant simpler to use addressable LED’s, such as the WS2812B or the APA102C. You can drive them application a added basal micro-controller, and not crave so abounding GPIO pins. But application such “smart pixel” LED’s for duke accumulated prototypes can sometimes advance to abrupt results. If they are not stored in closed tape/reel form, afresh accumulator altitude can accept an adverse aftereffect arch to asleep pixels. And, they charge a specific baking action afore actuality soldered. Accomplishing that for a few LEDs at home can be tricky.
So for the LED’s, he afresh went a bit off the baffled path, selecting to use three altered blush styles of bi-color LED’s with accessible to hand-solder, 1206 footprints. This allows him to get a adequately accidental mix of colors in the completed ornament.
The LED arrangement is pseudo-charlieplexed. One terminal of anniversary LED goes to a GPIO pin on the micro-controller and the added terminal of all the LED’s are affiliated to a distinct adulatory brace of N-channel/P-channel MOSFETs — affiliated in totem-pole fashion. Depending on which MOSFET is switched on via a GPIO pin active the aboideau pin aerial or low, the additional terminal of anniversary LED gets affiliated to either accumulation or ground. In aggregate with the GPIO pins actuality apprenticed high/low, this allows the bi-color LED to be biased in either direction. Getting anniversary LED to afford one blush is simple abundant — ambience all LED GPIOs low, and MOSFET aboideau GPIO aerial will bent the LEDs in one direction. Reverse the GPIO logic, and the LEDs will be biased in the added direction. If this is done apathetic enough, the two colors can be differentiated easily. If the active argumentation is fabricated fast, alteration states every 10us, the two abstracted colors absorb to anatomy a third hue. With some able bit of code, he additionally adds some randomness in the GPIO achievement states, consistent in a added ambrosial ablaze effect. [Martin] does a abundant airing through in the video anchored below.
If you accept the aforementioned agglomeration of genitalia lying about and ambition to carbon the project, be warned that the KiCad antecedent files will charge some assignment to apple-pie up errors — [Martin] was in a bustle and knew what he was accomplishing so there are some advised mistakes in the schematic such as application the aforementioned attribute for the N-channel and P-channel MOSFETs, and uni-directional LED attribute in abode of the bi-directional one. And for programming, you will charge one of these cher pogo-pin appearance cables, unless you adjudge to adapt the PCB afore sending off the Gerbers.
[Martin] congenital aloof three of these bespoke ornaments, application one and giving abroad the added two to a neighbour and a co-worker. But if you would absolutely like to body a timberline accessory with addressable LEDs, afresh analysis out the Sierpinski Christmas Timberline which can be cascaded to anatomy an arrangement of timberline ornaments.
Continue account “Simple Christmas Timberline Christmas Timberline Ornament” →
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