This example shows how to read touch coordinates from an STMPE610 resistive touch controller using I²C or SPI. The sketch detects touch events, reads X/Y/Z pressure data, and prints everything to Serial for debugging and calibration. The STMPE610 is a…
This example shows how to control 8 LEDs using the PCF8574 I²C GPIO expander with an ESP32. The sketch cycles through each LED by sinking current through the expander pins, demonstrating how the PCF8574 works and why wiring matters. The…
This example shows how to use the Adafruit nRF8001 Bluetooth Low Energy breakout in callback mode. The sketch starts advertising, reports connection events over Serial, receives incoming BLE UART data, prints it, and immediately echoes the same data back to…
This example is the classic Adafruit graphics demo for the GC9A01A round TFT display. It initializes the display over SPI, runs several drawing benchmarks, prints the timing results to Serial, and then keeps rotating a text demo so you can…
Snippet summary:This example shows how to turn an ESP32 into a BLE beacon that broadcasts Eddystone URL frames. It periodically advertises a compressed URL, rotates between multiple URLs across wake cycles, and uses deep sleep to achieve ultra-low power operation.…
This example shows how to turn an ESP32 into a BLE beacon that broadcasts Eddystone TLM (Telemetry) frames. It periodically advertises battery voltage and temperature, then enters deep sleep to conserve power — making it ideal for low-power IoT beacon…
This example demonstrates how to build a secure ESP32 BLE client using a static passkey. It scans for a BLE server, connects securely using MITM protection, reads both insecure and secure characteristics, subscribes to notifications, and writes data to both…
This ESP32 BLE client example shows how to scan for a BLE server, find a specific service and characteristic by UUID, connect to the device, read data, subscribe to notifications, and write values back to the server. It is a…
This example shows how to use BLE5 extended scanning on the ESP32-C3 and ESP32-S3 with the Bluedroid stack. It scans for extended advertisements, looks for a specific advertiser name, and then creates a periodic advertising sync so the ESP32 can…
Unlock advanced Bluetooth capabilities on your ESP32-C3 or S3. This article explains how to use the Bluedroid stack to run multiple, distinct BLE advertising sets simultaneously from a single chip, bridging the gap between legacy BLE 4.x compatibility and high-performance…
Summary : Learn how to implement BLE 5.0 Extended Scanning on the ESP32-C3 and ESP32-S3. This guide breaks down the C++ Bluedroid code required to detect both legacy BLE 4.x and modern BLE 5 extended advertising packets, giving you complete…
This beginner guide explains a typical ESP32 BLE beacon scanner sketch: how scanning works, what RSSI means, how to detect iBeacon/Eddystone (or any BLE advertising packet), and how to filter by MAC address, UUID, or name. You’ll also learn the…
This beginner guide explains Espressif’s ArduinoOTA example for ESP32. You’ll learn what OTA is, how the ESP32 advertises itself on your network, how the upload works in Arduino IDE, what each callback means (start/progress/end/error), and the most common fixes when…
This beginner guide explains how to wire a pushbutton to an ESP32 and use it to control an LED. You’ll learn what digitalRead() returns, why pinMode() matters, and how to avoid the most common beginner issue: a floating input (random…
This beginner guide explains the famous Blink sketch line-by-line on an ESP32/Arduino board. You’ll learn what setup() and loop() do, how pinMode() works, what HIGH/LOW really mean, and why delay(1000) makes the LED blink once per second (plus fixes if…
