Super FX Sword using the BBC micro: bit -- Episode 432

Frequent thrift shopper, Karen, digs into her to-be-hacked pile and pulls out a plastic sword that has an uncanny resemblance to a piece of the Guts AgroCrag (shout out to the 90s kids in the room!). In this project, Karen uses a BBC micro:bit to level up this toy by adding motion-activated light and sound effects.

Bill of Materials

Product Name	Manufacturer	Quantity	Buy Kit
KDMG28008 -LOUDSPEAKER, MICRO, 28mm, 8ohm, 200mW	Kingstate	2	Buy Now
Battery Holder, AAA Battery Size, 2 Slot, Wire Lead Mount, On / Off Switch	Pro Elec	1	Buy Now
Slide Switch, SPDT, Tall, 2.5mm, Through Hole, 30V, 300 mA	E-SWITCH	1	Buy Now
BBC micro:bit, w/ battery holder & USB	BBC micro:bit	1	Buy Now
Red LED, Through Hole, 5mm, 20 mA, 2.1 V	LED TECHNOLOGY	2	Buy Now
LED, Yellow, Through Hole, T-1 3/4 (5mm), 5 mA, 1.9 V, 587 nm	Multicomp Pro	2	Buy Now
LED, Orange, Through Hole, T-1 3/4 (5mm), 20 mA, 2 V, 625 nm	Multicomp Pro	2	Buy Now
Through Hole Resistor, 1 kohm, 400 mW, ± 1%, Axial Leaded, 200 V	Multicomp	6	Buy Now

Additional Parts:

Product Name
Plastic Sword
Harbor Freight 4pk Fatigue Puzzle Mats
3mm MDF

Super FX Sword using the BBC micro:bit

element14 presents | About Karen | Project Videos

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davedarko over 5 years ago

There's something seriously wrong here. When the lights go up, the tone should go up

Not sure if this is relevant, but the site here says something like "P0 through P4, or P10" are pins for analogWrite? Your code seems to use P11 through P16 but you actually use 7 LEDs when showing it, so I'm not sure if you swapped things in between.
https://makecode.microbit.org/reference/pins/analog-write-pin

I don't see anything stated about analogWrite only working on certain pins here though.
https://microbit-micropython.readthedocs.io/en/latest/pin.html

A-ha! "The DAL DynamicPWM driver (and the underlying nrF51 timer peripherals) dictate that PWM can only be active on 3 pins simultaneously. Any attempt to allocate a 4th pin for PWM use, will disable one of the existing PWM pins."
https://tech.microbit.org/hardware/edgeconnector/#pins-and-signals
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davedarko over 5 years ago

There's something seriously wrong here. When the lights go up, the tone should go up

Not sure if this is relevant, but the site here says something like "P0 through P4, or P10" are pins for analogWrite? Your code seems to use P11 through P16 but you actually use 7 LEDs when showing it, so I'm not sure if you swapped things in between.
https://makecode.microbit.org/reference/pins/analog-write-pin

I don't see anything stated about analogWrite only working on certain pins here though.
https://microbit-micropython.readthedocs.io/en/latest/pin.html

A-ha! "The DAL DynamicPWM driver (and the underlying nrF51 timer peripherals) dictate that PWM can only be active on 3 pins simultaneously. Any attempt to allocate a 4th pin for PWM use, will disable one of the existing PWM pins."
https://tech.microbit.org/hardware/edgeconnector/#pins-and-signals
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