MCU Atlas

Small builds for when the power goes out. ESP32 and LoRa projects with full parts lists, written for beginners. Follow so you don't miss the next one. 🔦

[MCU Atlas @MCUAtlas]

The UK's Be Ready campaign asks homes to be ready for 3 days, noting severe weather can hit power, phones and the internet. 📻

Trail Mate turns a LilyGO T-Lora Pager or T-Deck into an offline handheld: Meshtastic or MeshCore chat and offline maps. No phone needed.

By vicliu624

[MCU Atlas @MCUAtlas]

Building the frame, wiring the shields, tuning each motor and flashing the balancer:
https://t.co/74jk1l2nDj

[MCU Atlas @MCUAtlas]

A balancing robot on gimbal brushless motors 🛞

This SimpleFOC build uses field-oriented control for smooth, quiet torque, with magnetic encoders and an IMU. The 3D-printed frame is modular, so you can swap motors, drivers and boards.

By simplefoc

[MCU Atlas @MCUAtlas]

A password manager that types for you 🔐

An ESP32-S2 pocket handheld that stores your logins, TOTP seeds and FIDO2 keys offline, then types username and password for you as a USB keyboard. No cloud — its management UI is served over USB.

By Jiamu

[MCU Atlas @MCUAtlas]

Programs with custom start times and repeats, zone expanders, the apps for every platform, and where to buy it ready-made:
https://t.co/TaVUUj2LsN

[MCU Atlas @MCUAtlas]

Swap the old sprinkler box for an open-source one 💧🌱

OpenSprinkler adjusts watering from public weather data and an optional rain sensor. It runs 8 zones, expandable with add-on boards, and you control it from a browser or free apps for iOS and Android.

By OpenSprinkler

[MCU Atlas @MCUAtlas]

Your bike's data, on a round screen you build 🏍️
A 1.85in ESP32-S3 touch display pairs with a cheap BLE ELM327 adapter and shows live RPM, speed, estimated gear, temps, voltage and fault codes — ten swipeable pages, zero wires cut on the bike.

By Gonzalo Toledano

[MCU Atlas @MCUAtlas]

The wiring, the config file, command mode and firmware updates:
https://t.co/gr783UZRlL

[MCU Atlas @MCUAtlas]

Log any serial output to a microSD card 💾

SparkFun's OpenLog listens on a UART and writes everything to the card, so any microcontroller that can print can log without an SD library. Settings live in a config file on the card.

By sparkfun

[MCU Atlas @MCUAtlas]

Which version to use, flashing, assembling the shield and the $ settings:
https://t.co/rI18A8ydMS

[MCU Atlas @MCUAtlas]

The firmware behind many hobby CNC machines 🛠️

grbl runs on an Arduino Uno with a CNC shield, reads G-code over serial and drives three axes. A build tip: from v0.9 the Z-limit and spindle-enable pins swapped, so old wiring guides are wrong.

By grbl

[MCU Atlas @MCUAtlas]

The ready-made board vs. a DIY build (ESP32, ILI9341 TFT, LiPo), where the firmware and wiki live, and the own-gear-only rule:
https://t.co/WPu9TVJIwQ

[MCU Atlas @MCUAtlas]

A security-research toolkit for your own Wi-Fi and Bluetooth 🛡️📶

ESP32 Marauder is a suite of Wi-Fi and Bluetooth tools for the ESP32. Buy a ready-made board or build your own.

Only for networks and gear you own or have permission to test.

By justcallmekoko

[MCU Atlas @MCUAtlas]

Printing the frame, wiring the electronics and tuning the PID:
https://t.co/gjBXNmk1e2

[MCU Atlas @MCUAtlas]

The classic balancing-robot recipe on an ESP32 🤖

An MPU6050 measures tilt, a PID loop works out the correction and two steppers on DRV8825 drivers keep it upright, in a 3D-printed frame. An older repo, best read as a reference build.

By trandi

[MCU Atlas @MCUAtlas]

Getting a DVI output, building with the Pico SDK and flashing:
https://t.co/4U4yjQNkSf

[MCU Atlas @MCUAtlas]

HDMI video from a Raspberry Pi Pico 🖥️

PicoDVI bit-bangs a DVI signal with the RP2040's PIO, driving a monitor through a simple resistor network or a DVI Sock. Demos include a text terminal and a bouncing cube.

By Wren6991

[MCU Atlas @MCUAtlas]

Which board version to pick, installing it and staying legal:
https://t.co/OHevMI0x8r

[MCU Atlas @MCUAtlas]

A LoRa chip, turned into a handheld radio scanner 📡

LakeShark uses an undocumented LR2021 ROM command to pull raw I/Q from the LoRa chip on the LilyGO T-Display P4 (LR2021 version), then decodes FM/AM, POCSAG, ADS-B, P25 voice and MeshCore.

By SAMS0N1TE

[MCU Atlas @MCUAtlas]

A soil sensor that wakes for less than a second 🌱🔋
One ESP32-S3 and a single 18650 cell: the node wakes for 0.8 s, reports soil moisture, battery voltage and Wi-Fi signal to your own MQTT broker, then sleeps. The maker estimates about 1.5 years per charge.

By Sezgin Bilketay

[MCU Atlas @MCUAtlas]

Parts, breadboard vs. the repo's KiCad PCB, the persona gallery (Ada Lovelace to Daffy Duck) and why you need your own OpenAI API key:
https://t.co/g5UznWrhrA

[MCU Atlas @MCUAtlas]

A voice assistant with no personality until you write one 🎙️

VA5 is a push-to-talk ESP32-S3 build with a round animated face. From your phone, write its persona, pick its voice and language, and swap in your own face. No reflashing.

Born in classrooms.

By iollama