Upside Down Labs has designd a small, open source bio-potential amplified:
BioAmp EXG Pill is a small and elegant BioPotential board that you can use with any 5v micro with an ADC. It can be used to record research-grade ECG, EMG, EOG, and EEG without incorporating any filtering circuit/code!
From Jeremy Cook on the Tindie blog:
AtomIO Simplifies Your Breadboard UI
We’ve all been there, you hook things up to a breadboard, only to find that you need to figure out a simple LED indicator to see what’s going on, or have to use a wire or two as an input “button.” This is fine, but not really optimal. You can of course add actual buttons and switches, and perhaps cut down your LEDs to make them more presentable, but this takes up valuable space and time.
If you’d like a little shortcut to this problem, then the Atom IO may be just what you need. The device plugs in to the + and – rails of a breadboard, with 5 lines that connect to 3 LEDs, as well as 2 buttons. The LEDs are routed to the ground rail, so if you apply 2-ish volts, each will light up. The buttons are normally pulled low, but supply voltage from the positive rail when engaged.
As its name implies, the AtomIO is very small, allowing you to squeeze it into limited breadboard space. While you could certainly take care of any of these tasks yourself, it looks like a great way to clean things up, and perhaps even save a little time! Default LED colors are green, yellow, and red, but you can request customizations if you so choose.
Gareth Halfacree writes on Hackster:
Available to order as a PCB from OSH Park or a completed unit from Tindie, this compact Arduino-compatible aims to make BLE a cinch.
PeskyProducts and Tlera Corp have designed an open-hardware development board for Bluetooth Low Energy (BLE) projects, built around STMicro’s STM32 microcontroller and boasting full Arduino IDE support: the Firefly BLE.
“This is a small, open source hardware implementation designed to make using and customizing the STM32WB55 easy for everyone,” Tlera Corp explains of the Firefly BLE’s design. “It supports iBeacon, NUS, BlueST protocols as well as standard and custom BLE services and characteristics.
“For several years we have been making use of ST’s STM32L4 family of ultra-low-power MCUs in a variety of applications including development boards, asset trackers, and environmental monitors. Often we include a BMD-350 (nRF52) module for BLE connectivity with smart devices like Android and IOS phones, etc. With the new dual core STM32WB55 MCU, we can now make devices similar in cost, size, and functionality to those we have been but also have the added benefit of embedded BLE connectivity.”
From Jeremy S Cook on Tindie:
What is it?
PCB originally designed to control cooling fans on Raspberry Pi boards, but can be used with other small motors or DC loads. Can also work with Arduino and other such dev boards.
Why did you make it?
Wanted a way to control cooling fans off of a Raspberry Pi. While some fans have PWM inputs, some do not. Notably, this works well with the GPIO fan control option in Raspberry Pi OS.
Not a full motor driver (i.e. it only drives in one direction) but can be used with other simple DC motors as well. Also, can be used with Arduino et al.
What makes it special?
It’s very, very small, even compared to the first version. In fact, and should therefore be able to fit inside nearly any case. The 90º headers are even spec’d out to be low profile.
Upside Down Labs has this neat kit on Tindie that lets you listen to your muscles!
BioAmp v1.5 is a single chip biopotential amplifier. It can record any biopotential signal non-invasively and doesn’t require any microcontroller to sample the signal. You just plug 9v Battery to board, Electrodes to body and Audio jack to Mobile/Laptop and you are ready to record signals like EMG, ECG, EOG, and EEG. You can record the signals on a pc using audacity OR on mobile using Backyard Brain’s spike recorder app.
The SID Chip is one of the most hallowed components of electronic equipment, housed inside the original Commodore 64 and responsible for some of the most iconic chiptunes ever made. The Commodore 64 & 128 GOLD SID Sound Interface Device is a direct replacement for the original SID chip which will ensure the rare and valuable chip is safe, while accurately replicating its output and performance.
The chip installation will include desoldering the original chip, which will require some advanced soldering skills – but there are many tutorials online which will help you with this and it can be done however scary it may seem! The SID chip in the Commodore 64 came in two versions – the MOS 6581 and the 8580, both of which can be replaced by this neat board.
Ketan Desai designed this tiny PCB to be a DC-DC converter that works as a drop in replacement for old TO-220 linear regulators:
Swap out your LDO for a switcher today, with these designs for a modern take on the TO-220 mounted LM1117 and 78xx series LDO regulators!
This project is my take on a quick and easy replacement for the 3-pin LDO. The aim is to replace TO-220 linear regulators with a switching converter, in pursuit of higher efficiencies and current capacity.Using a Recom RPX series DC-DC module for its small size and incorporating SMD feedback resistors and bulk capacitance on board allows for a drop-in replacement to existing LDO designs, while remaining in the same overall footprint as the counterpart.
As LM1117 LDOs have a different pinout to the 78xx series of regulators, I designed two versions of the layout.
Jared Wolff designed this nRF9160-based board in the Adafruit Feather form-factor featuring cellular connectivity, GPS and low power features:
The nRF9160 Feather by Jared Wolff (aka Circuit Dojo LLC) is an electronics development board. It features tghe nRF9160 by Nordic Semiconductor. This part is capable of both CAT M1 LTE and NB-IoT for communication with the outside world. It’s compatible with the Zephyr RTOS which is fully baked into Nordic’s nRF Connect SDK. Other toolchains and languages coming soon to a Github repository near you.
From Jo Hinchliffe on the Tindie blog:
Humo the Soldering Fume Collector
Whether you use lead free or leaded solder, it’s always a good idea to avoid inhaling fumes whilst soldering. This cute character “Humo” can help keep your lungs healthy whilst you tinker.
Humo is a kit by Blinkyparts and features a cute laser-cut enclosure and a collection of parts to make a fume extractor/collector. There is a 120mm fan included which draws fumes through a supplied activated charcoal filter to capture the fumes. Humo’s wooden legs allow you to position and angle it to get the best position whilst you work. For power it comes with a 12v supply and connector. Looking over the documentation, however, you could opt to add some parts yourself and make a 5V-12V boosted supply meaning it can then run from a USB socket or powerbank for portable use.
Finally, it’s fair to say that fume collectors are a great way to begin taking care of your lungs whilst soldering but you should also ensure that your work area is well ventilated giving you a good supply of fresh air!
From Amethyst IND on Tindie:
Commodore 64 GOLD PLA C64 Programmable Logic Array
This is a programmable logic array constructed using a Gold-Immersed PCB adapter, high quality round pin sockets, and two double GAL chips. This is a replacement for the known vintage defect device on the C64 (U17)
OSH Park 