Understanding the Adafruit_PCF8575 Button Example Microcontrollers never seem to have enough pins. That’s where the PCF8575 comes in: a simple I²C 16-bit GPIO expander that gives you 16 extra digital pins using only 2 wires (SDA/SCL). The Adafruit example you…
The BME280 is a tiny environmental sensor that measures: From pressure, you can also estimate altitude, which is exactly what the Adafruit example you posted does. In this guide we’ll: 1. What is the BME280? The Bosch BME280 is a…
Understanding the Adafruit ADS1X15 Example The ADS1115 (16-bit) and ADS1015 (12-bit) are very popular external ADC chips. They talk over I²C, give you 4 analog inputs, and include a programmable gain amplifier (PGA) so you can measure both tiny and…
Most ESP32 projects are powered from USB adapters and run 24 battery-powered sensors, that approach kills the battery in a few hours. To build long-lasting wireless sensors (temperature, humidity, leak, motion, etc.) running on 18650 cells or LiPo batteries, the…
Sensirion’s SHT-series sensors are considered the gold standard in temperature and humidity sensing.They are used in industrial HVAC, medical devices, consumer electronics, environmental monitoring, and high-accuracy IoT projects. This article compares all SHT sensors, highlighting accuracy, stability, power consumption, differences,…
Bosch Sensortec is the leader in environmental sensing for IoT, and their BMP/BME sensors are used everywhere—from drones and weather stations to air-quality monitors and smart-home automation.Although many modules look identical, each generation offers different capabilities, accuracy improvements, and target…
This guide shows the exact wiring, exact libraries, and tested code to read temperature, humidity, and pressure from a BME280 sensor using I2C. 1. What You Need Use one of these BME280 modules: You also need: 2. Check Your BME280…
