ATtiny85 Mailbox Flag: Remember an Opening, Then Sleep
Build a sleeping ATtiny85 mailbox flag with a lid contact, acknowledge button and press-to-view LED. Measure the complete current budget instead of guessing battery life.
Author: Tricky Circuit
Pico Tank-Level Model: Two Switches, Four States
Model low and high float contacts with two switches. Debounce the pair, display three plausible tank levels and flag the impossible combination before adding any actuator.
ESP32 Climate Node: An Invalid Reading Is Not Zero
Read a documented SHT31-D breakout with an ESP32. Validate both checksums, calculate temperature and humidity, and label stale readings when communication fails.
24LC256 Settings Store: Two Records and a Commit Marker
Save one setting in two versioned EEPROM records. Split writes at page boundaries, verify data and recover an older record after an incomplete update.
MCP23017 Button Panel: Interrupt Capture Is Not Debouncing
Connect eight buttons to an MCP23017, read captured changes and reconcile the current state. Avoid its output-only pins and distinguish capture from debouncing.
MCP6002 Sensor Buffer: Measure Input Loading and Output Error
Build a 3.3 V MCP6002 buffer and compare a loaded sensor divider with its buffered output. Calculate meter loading, resistor error and output headroom.
TLC555 at 3.3 V: Why Holding the Button Stretches the Pulse
Build a 3.3 V TLC555 one-shot. Calculate its LED pulse, compare a tap with a held button, and understand reset, capacitor leakage and timing error.
🎵 Creating Music with an ATtiny Microcontroller
1️⃣ Requirements 2️⃣ Circuit Setup 3️⃣ Programming the ATtiny To generate music, you’ll be creating a sequence of tones by varying the frequency of the …
🔧 Schematic: Connecting a Relay with an External Power Source and Arduino
1️⃣ Components Needed 2️⃣ Schematic Diagram Here’s how to wire these components: Details of Connections: Additional Components: 3️⃣ Code Snippet for Arduino To control the …
Here’s the WebSockets version for smooth, real-time motor control via Wi-Fi. 🚀
🔹 Why Use WebSockets? 📌 1️⃣ Arduino R4 WiFi Code This sets up a WebSocket server on port 81 to control:✅ SG90 servo motor✅ 28BYJ-48 …