PinoutHub The MQ3 is an analog alcohol gas sensor that detects ethanol vapour in the air by measuring changes in electrical resistance across a heated tin dioxide sensing element. It provides both an analog voltage output proportional to alcohol concentration and a digital threshold output, making it easy to interface with microcontrollers. The sensor is commonly … Read more
The BME688 is a compact, digital 4-in-1 environmental sensor that measures gas, humidity, pressure, and temperature in a single package — purpose-built for mobile and connected devices where size and energy efficiency are non-negotiable. Its gas sensing capability is particularly noteworthy — it can detect volatile organic compounds (VOCs), volatile sulfur compounds (VSCs), carbon monoxide, … Read more
The BME680 is a digital 4-in-1 environmental sensor by Bosch Sensortec that measures gas (VOCs), humidity, pressure, and temperature — all over a single I²C or SPI connection. It takes everything the BME280 measures and adds a metal oxide gas sensor on top, making it capable of detecting volatile organic compounds in the surrounding air … Read more
The BMP280 is a digital barometric pressure and temperature sensor by Bosch Sensortec. It measures absolute air pressure and derives altitude from it, while the onboard temperature sensor handles internal compensation. It is the direct successor to the BMP180 (smaller footprint, lower power draw, less noise, higher resolution, and SPI support added alongside I²C) and … Read more
The DHT22 is a digital temperature and humidity sensor by Aosong Electronics, also sold under the name AM2302. It measures both parameters through a single data line and outputs fully calibrated digital readings — no ADC, no analog noise, no external calibration required. For projects where the DHT11’s ±2°C accuracy and limited humidity range aren’t … Read more
The MQ2 is an analog gas sensor by Hanwei Electronics that detects flammable gases and smoke by measuring changes in electrical resistance across a heated tin dioxide element. It outputs both an analog voltage proportional to gas concentration and a digital threshold signal, making it straightforward to wire into any microcontroller project without needing a … Read more
The TMP36 is a low-voltage analog temperature sensor by Analog Devices, designed for use in electronics, embedded systems, and microcontroller-based projects. It measures temperature by outputting an analog voltage that scales linearly with degrees Celsius — no external calibration, no complex interface, just a voltage your ADC can read directly. Its wide supply range of … Read more
The DHT12 is a digital temperature and humidity sensor by Aosong Electronics — the same manufacturer behind the DHT11. It measures both environmental parameters and outputs calibrated digital data, but adds something the DHT11 never had: an I2C interface alongside the original single-wire protocol. That dual-interface design makes it a more flexible drop-in for projects … Read more
The BME280 is a digital environmental sensor that measures temperature, humidity, and barometric pressure simultaneously — three parameters, one IC, one I²C or SPI connection. It is factory-calibrated, runs on as little as 1.71V, and draws under 4µA when sampling all three sensors at 1Hz, making it as practical in a coin-cell-powered weather node as … Read more
The DHT11 is one of the most widely used digital temperature and humidity sensors in Arduino and electronics projects. It measures both temperature and relative humidity using a single digital output pin, and is commonly found in weather stations, HVAC systems, greenhouses, and home automation projects. What is DHT11? The DHT11 is a basic integrated … Read more