Black Lives Matter - Action and Equality. ... Adafruit is open and shipping.

Reverse Engineering an Insulin Pump for DIY Closed Loop Therapy #Diabetes #Diabetic #ReverseEngineering @PS2

Pete Schwamb writes recently on Noteworthy about Insulin Pumps, Decapped chips and Software Defined Radios:

Roughly 3 years ago, I heard about a website offering a bounty for something that was very close to my heart: reverse engineering communications to an insulin pump. My daughter was already using a system that I had helped to create called Loop, with a Medtronic pump that I had reverse engineered the RF comms for. But the Medtronic pump required her to disconnect during her gymnastics for hours at a time. The tubeless design of this Omnipod pump sounded great, and I had all the tools to start working on the problem.

The Omnipod system consists of a small disposable pump called a pod, and a controlling unit called a PDM.

Because the PDM communicates with the pod using radio and the pod has no built in interface, it means the pod is entirely controllable over the radio. There was the potential to create a full integration with Loop using just a RileyLink, or a modified version of it.

I had to write new firmware that would handle the pod modulation and encoding. I also had to rewrite the way the two chips on the RL talked to each other to handle 0’s, as 0 was a special end of packet marker for Medtronic (pumps). Much in Loop needed to be reworked to support multiple Pumps, and new interfaces made to support pairing, deactivating, and handling faults. Thankfully Nate Racklyeft had set a solid foundation in Loop for this to happen.

New Features For Loop

Omnipod integration required rethinking of some interface elements, and adding new controls. The pod doesn’t report battery, and there is little a user can do about a low battery if one were to somehow happen, so displaying a battery level widget didn’t make sense. Also, without a UI on the pump, the user needs to be able to cancel a bolus quickly. The reservoir icon was a picture of a Medtronic reservoir, so we wanted to rethink that. Thank you to Paul Forgione for designing the pod logo that now shows reservoir level.

Thank you to all the people who help make this long road come to a place where we can share this with others, and realize the goal that we set out to do a long time ago. I know I didn’t cover everyone, and everything that happened. That would be impossible in a single post, and for me, since I only have my experience through this. It’s hard to imagine the total hours put into this. If you could add them all up, I’m sure it would be shocking. Not to mention the work that has gone into making the Omnipod itself, which I imagine dwarfs this effort. So thank you *all*. Also, many of those hours would otherwise have been spent with families. I really appreciate my wife and kids being understanding with the time I’ve spent on this, and want to thank them too.

We are angry, frustrated, and in pain because of the violence and murder of Black people by the police because of racism. We are in the fight AGAINST RACISM. George Floyd was murdered, his life stolen. The Adafruit teams have specific actions we’ve done, are doing, and will do together as a company and culture. We are asking the Adafruit community to get involved and share what you are doing. The Adafruit teams will not settle for a hash tag, a Tweet, or an icon change. We will work on real change, and that requires real action and real work together. That is what we will do each day, each month, each year – we will hold ourselves accountable and publish our collective efforts, partnerships, activism, donations, openly and publicly. Our blog and social media platforms will be utilized in actionable ways. Join us and the anti-racist efforts working to end police brutality, reform the criminal justice system, and dismantle the many other forms of systemic racism at work in this country, read more @

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 20,000+ makers on Adafruit’s Discord channels and be part of the community!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more

CircuitPython – The easiest way to program microcontrollers –

Maker Business — To make it through a tough business cycle, layoffs should be a last resort

Wearables — Everything in its place

Electronics — The Case Of The Disappearing Capacitance

Python for Microcontrollers — Python on Microcontrollers Newsletter: New Hardware, Python Releases and Much More! #Python #Adafruit #CircuitPython @circuitpython @micropython @ThePSF

Adafruit IoT Monthly — BLE Store Capacity Indicator, Aquarium Automation, and more!

Microsoft MakeCode — MakeCode Arcade Game Garden Jam!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — NEW PRODUCT – ESP-PSRAM64H Chip – 64 Mbit Serial Pseudo SRAM – 3.3V 133 MHz

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.