Illuminate the way with the adjustable PicoLight

As active members of the open-source hardware community, Bucharest-based makers Alexandra Covor, Constantin Craciun, and Mihnea Stoica regularly post project tutorials for the wider community. In the latest issue of The MagPi, they show off PicoLight.

Impressive images of their projects are essential in order to ignite interest. However, finding the right light to shine on their endeavours was becoming a challenge, so like all good makers, the team decided to make their own. 

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Diffused by an acrylic panel, the light from the NeoPixels is used to illuminate photo shoots

PicoLight is the result – a Raspberry Pi Pico-based, minimalist adjustable light which is perfect for low-light photography, as project lead Alexandra shares: “Studio lights are great, but they are often too big and too bright for our tiny [hardware] projects, so this is where PicoLight comes in, being ideally sized.”

Small but mighty

Alexandra describes PicoLight’s user experience as “pretty simple”. It’s made up of two fully customised PCBs and an acrylic panel sandwiched together. One PCB is a LiPo battery shield including a charging circuit and a power switch, while the other PCB is a 4×4 NeoPixel matrix with a Raspberry Pi Pico soldered onto the back. It also features a rotary encoder with a push-button, “used to switch between the functioning modes: colour adjustment, brightness adjustment, and rainbow mode, in which the LEDs cycle through all the colours.”

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The 4×4 NeoPixel matrix in rainbow cycle mode

The team initially connected an external battery to Pico’s micro USB port, but Alexandra says that they soon realised that portability was key, “so we ended up designing our own battery shield as well.”

All of this has resulted in a very neat-looking and compact end product. As the PicoLight measures just 52×52 mm, they were a little concerned about how they would fit all of the features on it, but “then it hit us that we can actually build vertically, and add a new layer for every new feature we want to integrate, such as the battery charging module,” says Mihnea.

They’ve found it a useful tool on a day-to-day basis and while PicoLight’s main purpose is adding a “dash of colour to macro photography… we’ve also used it to add a rather nice touch to video calls,” Mihnea adds.

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The NeoPixel PCB is sandwiched between an acrylic diffuser panel and the LiPo battery shield

In the limelight

The response to PicoLight received so far has been hugely encouraging. “PicoLight ended up being much more popular than we’ve expected,” says Alexandra. “Some of our photographer friends asked for PicoLights to use in their shoots.” 

While considering a few improvements, including the possibility of using the RP2040 chip on a custom board rather than the entire Pico, Constantin tells us that since the feedback has been so positive, and everybody asked where they can buy it, they are pondering crowdfunding the project to bring it to mass production.

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Raspberry Pi Pico is surface-mounted on the rear of the NeoPixel matrix PCB

The team are well-accustomed to using Raspberry Pi boards in their projects. “We have worked a lot with Raspberry Pi development boards for various IoT projects,” says Constantin, “like automated points of sale, magic mirrors, and automated crypto trading bots to name a few, and we are excited about exploring the Pico microcontroller range.” 

They have also, generously, made this project open-source, as Constantin explains: “We foresee using the Raspberry Pi variants in lots of future projects since they offer so much flexibility and the support of the community is so good. We’re also actively giving back whenever we can by open-sourcing our [Raspberry] Pi-based projects.” 

If you’d like to try and make your own PicoLight, step-by-step instructions are available on Hackster), and Mihnea thinks that any intermediate-level maker with a hot plate or DIY reflow oven would be able to achieve this make, as the right tools “make short work of this project.”

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Is it rgb or just colored leds?

Reply to Nate Boyko

Liz Upton

They’re neopixels, so RGB – if you’ve not played with them before, hearty recommend!

Reply to Liz Upton

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