{ "metadata": { "id": "adafruit-ens161-breakout", "name": "Adafruit ENS161 MOX Gas Sensor - STEMMA QT / Qwiic", "type": "sensor", "categories": [ "sensor" ], "description": "ScioSense ENS161 MOX multi-gas sensor on an Adafruit STEMMA QT / SparkFun Qwiic breakout. Designed for indoor air-quality monitoring outputs (eTVOC, eCO2, AQI) over I2C, with optional SPI via exposed pins. Breakout adds 3.3V regulator + level shifting for 3–5V-friendly usage.", "manufacturer": "Adafruit", "part_number": "6431", "datasheet_url": "https://cdn-shop.adafruit.com/product-files/6431/ENS161-Datasheet.pdf", "tags": [ "ens161", "sciosense", "mox", "gas", "etvoc", "eco2", "aqi", "i2c", "spi", "stemmaqt", "qwiic", "0x53", "0x52" ], "schema_version": "1.1.0", "definition_revision": "0.1" }, "domains": [ { "domain": "electrical", "power_domains": [ { "id": "vin_3to5", "name": "VIN (3–5 V) to onboard regulation", "nominal_voltage_V": 5, "voltage_range_V": [ 3, 5 ], "max_current_mA": 100, "isolation_type": "non_isolated", "ground_reference": "common", "description": "Breakout VIN input (3–5V friendly). Peak ENS161 internal current can reach ~45mA for <5ms depending on mode; breakout input budget set conservatively." } ], "resources": [ { "id": "vin", "name": "VIN", "functions": [ { "name": "power_input", "signal_class": "power" } ], "connector_type": "pin_header", "power_domain_id": "vin_3to5" }, { "id": "gnd", "name": "GND", "functions": [ { "name": "ground", "signal_class": "ground" } ], "connector_type": "pin_header", "power_domain_id": "vin_3to5" }, { "id": "pin_1", "name": "pin_1", "functions": [ { "name": "i2c_sda", "signal_class": "data" }, { "name": "spi_mosi", "signal_class": "data" } ], "connector_type": "pin_header", "notes": "ENS161 SDA pin is open-drain in I2C mode." }, { "id": "pin_2", "name": "pin_2", "functions": [ { "name": "i2c_scl", "signal_class": "clock" }, { "name": "spi_sck", "signal_class": "clock" } ], "connector_type": "pin_header" }, { "id": "pin_3", "name": "pin_3", "functions": [ { "name": "spi_miso", "signal_class": "data" }, { "name": "addr", "signal_class": "data" } ], "connector_type": "pin_header" }, { "id": "pin_4", "name": "pin_4", "functions": [ { "name": "VDD", "signal_class": "power" } ], "connector_type": "pin_header", "notes": "VDD is the power supply for the ENS161." }, { "id": "pin_5", "name": "pin_5", "functions": [ { "name": "Vddio", "signal_class": "power" } ], "connector_type": "pin_header", "notes": "Vddio is the power supply for the ENS161." }, { "id": "pin_6", "name": "pin_6", "functions": [ { "name": "INTn", "signal_class": "data" } ], "connector_type": "pin_header", "notes": "INTn is the interrupt for the ENS161." }, { "id": "pin_7", "name": "pin_7", "functions": [ { "name": "CSn", "signal_class": "data" } ], "connector_type": "pin_header", "notes": "CSn is the chip select for the ENS161." }, { "id": "pin_8", "name": "pin_8", "functions": [ { "name": "GND", "signal_class": "ground" } ], "connector_type": "pin_header", "notes": "GND is the ground for the ENS161." } ], "interfaces": [ { "id": "power_in", "name": "Power input", "protocol": { "type": "power", "role": "input" }, "requires": [ { "function": "power_input", "count": 1 }, { "function": "ground", "count": 1 } ], "constraints": { "max_connections": 2, "requires_matching_voltage_domain": false }, "description": "Provide 3–5V to VIN (or via STEMMA QT) to power the breakout." }, { "id": "i2c_slave", "name": "I2C (slave)", "protocol": { "type": "i2c", "role": "slave" }, "requires": [ { "function": "i2c_sda", "count": 1, "shareable_with": [ "pin_2" ] }, { "function": "i2c_scl", "count": 1, "shareable_with": [ "pin_1" ] } ], "protocol_max_freq_Hz": 1000000, "constraints": { "max_connections": 8, "requires_matching_voltage_domain": true }, "description": "ENS161 is an I2C slave. Address is 0x52 when ADDR (MISO/ADDR) is low at power-up, or 0x53 when high." }, { "id": "spi_slave", "name": "SPI (slave)", "protocol": { "type": "spi", "role": "slave" }, "requires": [ { "function": "spi_mosi", "count": 1 }, { "function": "spi_miso", "count": 1 }, { "function": "spi_sck", "count": 1 } ], "protocol_max_freq_Hz": 10000000, "constraints": { "max_connections": 1, "requires_matching_voltage_domain": true }, "description": "SPI slave up to 10MHz. CSn low selects SPI mode (latched until next power-on reset)." }, { "id": "interrupt", "name": "Interrupt", "protocol": { "type": "interrupt", "role": "input" }, "requires": [ { "function": "INTn", "count": 1 } ], "constraints": { "max_connections": 1, "requires_matching_voltage_domain": true }, "description": "Interrupt is the interrupt for the ENS161." }, { "id": "chip_select", "name": "Chip select", "protocol": { "type": "chip_select", "role": "input" }, "requires": [ { "function": "CSn", "count": 1 } ], "constraints": { "max_connections": 1, "requires_matching_voltage_domain": true }, "description": "Chip select is the chip select for the ENS161." } ], "supply_voltage_V": [ 3, 5 ], "metadata": { "i2c_addresses_7bit": [ "0x52", "0x53" ], "operating_temp_C": [ -40, 85 ], "operating_humidity_percent": [ 5, 95 ] } }, { "domain": "mechanical", "package_type": "PCB Module", "dimensions_mm": { "length": 25.5, "width": 17.7, "height": 4.7 }, "resources": [], "interfaces": [] } ], "design_rules": [ "Initial start-up: after first power-on, eCO2/eTVOC/AQI are intended to be usable after ~1 hour in Standard mode; Low Power modes may require 3–24 hours for first-time conditioning.", "Warm-up after idle/power-off: typical ~3 minutes in Standard mode; Low Power modes may take up to ~60 minutes.", "I2C address is fixed to 0x52/0x53 selected by ADDR (MISO/ADDR) state at power-up—avoid address conflicts on shared buses.", "If using SPI, asserting CSn low selects SPI and disables I2C until the next power-on reset." ], "warnings": [ "ENS161 is not designed for safety-critical or life-protecting applications.", "Operate in non-condensing humidity; aggressive/poisonous gas exposure and off-condition environments can affect performance and lifetime." ], "artifacts": [ { "id": "art_primary_datasheet", "name": "Primary Datasheet", "type": "datasheet", "url": "https://cdn-shop.adafruit.com/product-files/6431/ENS161-Datasheet.pdf" }, { "id": "art_learn_guide", "name": "Learn Guide", "type": "link", "url": "https://learn.adafruit.com/adafruit-ens161-mox-gas-sensor/overview" }, { "id": "art_product_page", "name": "Product Page", "type": "link", "url": "https://www.adafruit.com/product/6431" } ] }