Andrew Childs built a Type 1 Diabetes monitor from scratch.
My 9 y.o. son has Type 1 diabetes, which basically means his pancreas is on manual (hard) mode 24×7. A healthy pancreas not only produces insulin, which helps convert glucose in the bloodstream into energy – it also produces glucagon, which tells the liver to release glucose into the bloodstream when blood sugar levels are too low. A person with T1D has to manage without either of these guardrails, and a low blood sugar can become a medical emergency if left untreated.