What is it? This is a programmable sound reactive board with 12 full-color Neopixel leds, specially designed to be used as a wearable device or a gadget for other audio systems. You can see how it w…Read More…
This is a programmable sound reactive board with 12 full-color Neopixel leds, specially designed to be used as a wearable device or a gadget for other audio systems.
You can see how it works in this video
The main MCU is the mainstream STM32f070F6P6 32-bit ARM Cortex-M0 operating at 48MHz, with 32Kb of FLASH memory and 6Kb of RAM. It can be programmed via Serial Wire Debug (SWD) port with an STLink programmer.
For audio input, it uses an omnidirectional electret microphone of 6x2,7mm with -50dB sensitivity working at frequencies from 100Hz to 10KHz. The signal is amplified with an op-amp that features rail-to-rail input and output, and the gain is controlled with a variable resistor so you can adjust the sensitivity according to the audio volume being heard. Please note: SMD variable resistors are fragile devices, so turn it gently ;)
For the LEDs, it uses WS2812 chips (aka Neopixel) in a 5050 package. You can select between two different versions:
The overall max consumption is 380mA for WS2812B and 180mA for the C version, but keep in mind that this is for full brightness white color. With typical application these values are much smaller.
There is a LDO voltage regulator to adjust input voltage to the 3.3V required by MCU. It accepts a max input voltage of 5.5V, but it must be down to a range of 3-4V for proper operation, so a LiPo one-cell (1S) is a good option. Also, a Schottky diode protects the system from reverse polarity.
Lastly, the board exposes I2C pins, so you can add additional sensors or peripherals. Also, there is a button connected to GPIO PA7, used for switching between display modes and change the brightness intensity (more info in github repo). The two M2 mounting holes can be used to attach it to other boards or to sew the plate.
It comes fully assembled (except pin headers for SWD and I2C; for input power you can choose the configuration), tested, and pre-programmed with the example available on the source code link. You only need to power it up to start enjoying it.
Neopixel leds are very striking, especially when used with audio. I need to have a plate small enough to be incorporated into portable devices or wearables: bracelets, baseball hats, backpacks, or simply as a complement to portable audio devices or desktop gadgets.
The round plate has 45x45mm with a thickness of 1mm (5mm assembled), making the final assembled board weights only 5 grams. The are many options available on internet in a form of led rings, but is hard to find an all-in-one board like this one.
No country selected, please select your country to see shipping options.
No rates are available for shipping to .
Enter your email address if you'd like to be notified when 12bit Sound reactive Neo-Ring can be shipped to you:
Thanks! We'll let you know when the seller adds shipping rates for your country.
Please note that orders placed on weekends will be shipped from Monday
Wolf | Dec. 19, 2022
Stefan | Oct. 1, 2020
Philip | Sept. 15, 2020
Adrian | Sept. 3, 2020
We recognize our top users by making them a Tindarian. Tindarians have access to secret & unreleased features.
We look for the most active & best members of the Tindie community, and invite them to join. There isn't a selection process or form to fill out. The only way to become a Tindarian is by being a nice & active member of the Tindie community!