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finally! local AI is accessible to everyone. we replaced our massive smart home server with a single $8 ESP32-S3 chip processing voice commands entirely on-device. now anyone can build this. here is the full guide:

wait. this drone can name every object in your house. in real time it flies through a kitchen and tags humans, chairs, tables, the oven, each with a confidence score the model is YOLOv5. "You Only Look Once": it looks at the whole frame in a single pass and returns boxes with a label and a number for how sure it is that's the purple box around the oven and it has one bad habit. it keeps calling everything a TV. a detector only knows the classes it was trained on, and TV is a common one, so any bright rectangle in a dark room gets a low-confidence TV label right now a human still flies it. the AI only watches the next step is turning those boxes into steering: chair ahead, turn. person ahead, stop

you've seen this bug in every car video the wheel suddenly spins backwards. the camera takes pictures too slowly for the wheel, so the picture lies this homemade STM32 oscilloscope has the same limit. it takes 10 million snapshots a second, and past 5 MHz its waves start lying like that wheel safe up to 3.33 MHz, cleanest at 1-2 every radio signal works by the same rule. my guide ↓

wait, a used phone under $200 is a whole computer? this is an S22 motherboard with no screen, no battery, just a fan. it runs a desktop on a monitor same chip class that runs small local AI models. most people throw this hardware away...

you can build a dashboard for almost anything this one is for a rally car: boost, oil temperature, coolant, battery voltage and engine status on a screen the size of a phone case a small board reads the messages the car already sends around, about 165 of them every second, and draws the numbers live for everything the car doesn't report, you add your own sensors. my guide to that is below what would you build one for?

this is what a Tesla looks like if you build it from cardboard no pistons or fuel here, just six tiny electric motors in a V, all pushing one big gear the V shape is borrowed from V6 engines. a real electric car is simpler: a motor turns the wheels through a gear, with no gearbox full of shifting the cardboard version still goes brrr

an ordinary calculator can become a counter for the physical world it already has a display, arithmetic logic, and a running total add an infrared sensor, and changes in reflected light can become counting pulses the trick is the "=" key: on compatible calculators, repeated presses keep adding 1. let the sensor trigger those presses, and the calculator does the counting the same principle can count passing objects, shaft rotations, or winding turns that’s a useful starting point for sensor projects: 1 decide what physical change matters 2 turn it into a clear event 3make the device respond my ESP32 sensor guide below covers choosing sensors, filtering noisy readings, and building that loop yourself ↓