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Notes from the bench

Pick a topic or start a learning path. Every article has a circuit, code or real dimensions you can follow.

Learning path · Beginner Your first maker project From your first LED to reading a sensor to printing a case for the board: circuits, code and 3D printing in one path.

Wire an LED to an ESP32 the right way: sizing the resistor with Ohm's law
Read temperature, humidity and pressure from a BME280 over I2C with an ESP32
Design a 3D-printed case that fits your board the first time

Start with lesson 1

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3 articles

#3D printBeginner

Design a 3D-printed case that fits your board the first time

Measure the board, choose clearance and wall thickness, work out the case size step by step, plan screw holes, USB cut-outs and vents, and pick PLA, PETG or ABS.

5 min read

#CodeBeginner

Read temperature, humidity and pressure from a BME280 over I2C with an ESP32

Wire the two I2C lines, find the address with an I2C scanner, read values with the Adafruit library, tell a BME280 from a look-alike BMP280, and why it reads too warm.

5 min read

#CircuitsBeginner

Wire an LED to an ESP32 the right way: sizing the resistor with Ohm's law

Why an LED always needs a resistor, the step-by-step sum for an ESP32 (3.3 V) and an Arduino Uno (5 V), which GPIO pins are safe, and blink and button code.

5 min read