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Larson Scanner 2021

Single-unit price: $19.00 + $6.00 flat rate shipping

Not available / campaign end date: Tue, 13 Apr 2021 14:03:00 PDT

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Backers: 14

Target icon campaign show

Target: 20

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Funded: 23

Product Details


Larson Scanner 2021

Brand / Manufacturer


Manufacturer Part #


Product Description


What is it?

Larson Scanner 2021 is the 4th revision of this popular product. And this version has way more features.

Why did you make it?

It's fun! Need any more reasons? And this new version is also more practical.

What makes it special?

Instead of using an ATtiny13 or similar this time I am using an ATtiny3216 and 16 addressable RGB LEDs. Besides the Larson Scanner pattern, one can program it with different patterns and there is a push button to select different function/patterns. There is more to it though. Onboard the PCB, which is same size as previous versions (165x17mm), there is also an I2C ambient light and temperature sensor, and a microphone! On the back you can solder Grove-style connectors giving access to UART, I2C & GPIO including DAC output. Supplied are right angle PH2.54 connectors but the connections are more or less following Grove ecosystem guidelines It is powered through the mUSB connector but can also use PSU4056L modules same as previous versions. mUSB is also used to access the UPDI programming pin and I even made a programmer to help with this (optional) Larson Scanner is using WS2812C addressable RGB LED for relatively low power consumption.

Using the LED array as a bar graph you can program it as a VU Meter, Thermometer, Night Light, or an indicator for various conditions limited only by your imagination. An add-on board is also in progress which will hold a 14500 Li-Ion or LiFePO4 cell and power management (charger etc.) and possibly a small audio amplifier & speaker to use with the DAC output.

LS2021LS2021 BACK

  • How many LEDs? 16x WS2812C RGB addressable LEDs
  • How much current? around 5mA when idle with LED off, 250mA max
  • What kind of power supply is needed? Any micro USB 5VDC source will be just fine but any 5VDC source can also be used. Combined with the PSU4056 voltage regulator, it can be used in an automotive environment or be powered from any DC source from 5-40VDC. Below you can add a modified PSU4056 using ceramic capacitors only for a slim profile.

I have also made a simple programmer for the new Larson Scanner as the UPDI is passing through the mUSB port.

LARSON SCANNER 2021 is using ATtiny3216

Why GroupGets?

Ordering more PCBs and components in volume helps maintain low cost but also helps fund me to design and prototype more interesting projects.

Purchase Information

Unit Deliverable

ONE (-1-) Larson Scanner pcb fully assembled

Unit Price


Campaign Part #



Not available / campaign funded, end date: Tue, 13 Apr 2021 14:03:00 PDT

Factory Lead Time

75 Days

Options and Add-Ons

UPDI programmer adapter


This is a small adapter to allow programming using Arduino IDE.

UPDI programming pin is accessible via the mUSB connector.

Arduino Nano NOT included.



PSU4056 is a small buck converter which allows powering Larson Scanner with a higher voltage (28V max)

Photo shows big electrolytic capacitors but in the version for Larson Scanner will be replaced by ceramic capacitors so the board will be as low-profile as possible.

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