{ "metadata": { "id": "sparkfun-sen-15112-scd30-co2-sensor", "name": "SparkFun SCD-30 - NDIR True CO2 Temperature and Humidity Sensor", "type": "sensor", "description": "Sensirion SCD30 NDIR CO2 sensor module carried by SparkFun (SEN-15112) with on-module temperature and humidity sensing. Supports I2C or Modbus/UART operation, plus RDY and PWM pins for data-ready and concentration output.", "manufacturer": "SparkFun Electronics", "part_number": "SEN-15112", "datasheet_url": "https://cdn.sparkfun.com/assets/8/4/1/2/2/61652CD3_Sensirion_CO2_Sensors_SCD30_Datasheet.pdf", "tags": [ "sen-15112", "scd30", "co2", "ndir", "temperature", "humidity", "i2c", "uart", "modbus", "pwm", "0x61", "sensirion", "sparkfun" ], "schema_version": "1.4.0", "version": "0.1.1", "taxonomy": [ "sensor.environmental", "sensor.gas", "expansion.breakout" ] }, "domains": [ { "domain": "electrical", "power_domains": [ { "id": "vdd_3v3_5v5", "name": "VDD (3.3V-5.5V)", "nominal_voltage_V": 3.3, "voltage_range_V": [ 3.3, 5.5 ], "max_current_mA": 75, "isolation_type": "non_isolated", "ground_reference": "common", "description": "Main sensor supply rail." } ], "resources": [ { "id": "pin_1_vdd", "name": "Pin 1 / VDD", "description": "Power input.", "functions": [ { "name": "power_input", "direction": "sink", "signal_class": "power" } ], "connector_type": "pin_header", "power_domain_id": "vdd_3v3_5v5" }, { "id": "pin_2_gnd", "name": "Pin 2 / GND", "description": "Ground reference.", "functions": [ { "name": "ground", "direction": "bidirectional", "signal_class": "ground" } ], "connector_type": "pin_header", "power_domain_id": "vdd_3v3_5v5" }, { "id": "pin_3_sda_rx", "name": "Pin 3 / SDA (I2C) / RX (Modbus)", "description": "Multiplexed between I2C SDA and UART RX (Modbus).", "functions": [ { "name": "i2c_sda", "direction": "bidirectional", "signal_class": "data" }, { "name": "uart_rx", "direction": "sink", "signal_class": "data" } ], "connector_type": "pin_header", "power_domain_id": "vdd_3v3_5v5" }, { "id": "pin_4_scl_tx", "name": "Pin 4 / SCL (I2C) / TX (Modbus)", "description": "Multiplexed between I2C SCL and UART TX (Modbus).", "functions": [ { "name": "i2c_scl", "direction": "sink", "signal_class": "clock" }, { "name": "uart_tx", "direction": "source", "signal_class": "data" } ], "connector_type": "pin_header", "power_domain_id": "vdd_3v3_5v5" }, { "id": "pin_5_rdy", "name": "Pin 5 / RDY", "description": "Data-ready status output.", "functions": [ { "name": "digital_io", "direction": "source", "signal_class": "status" } ], "connector_type": "pin_header", "power_domain_id": "vdd_3v3_5v5" }, { "id": "pin_6_pwm", "name": "Pin 6 / PWM", "description": "PWM CO2 concentration output.", "functions": [ { "name": "pwm_output", "direction": "source", "signal_class": "data" } ], "connector_type": "pin_header", "power_domain_id": "vdd_3v3_5v5" }, { "id": "pin_7_sel", "name": "Pin 7 / SEL", "description": "Mode-select input (low=I2C, high=Modbus/UART).", "functions": [ { "name": "digital_io", "direction": "sink", "signal_class": "control" } ], "connector_type": "pin_header", "power_domain_id": "vdd_3v3_5v5" } ], "interfaces": [ { "id": "power_input", "name": "Power Input", "protocol": { "type": "power", "role": "input" }, "requires": [ { "function": "power_input", "count": 1 }, { "function": "ground", "count": 1 } ], "description": "Power input interface." }, { "id": "i2c_slave", "name": "I2C Slave", "protocol": { "type": "i2c", "role": "slave" }, "requires": [ { "function": "i2c_sda", "count": 1 }, { "function": "i2c_scl", "count": 1 } ], "protocol_max_freq_Hz": 100000, "constraints": { "requires_matching_voltage_domain": true }, "description": "I2C interface (default 7-bit address 0x61)." }, { "id": "co2_pwm_output", "name": "CO2 PWM Output", "protocol": { "type": "pwm", "role": "output" }, "requires": [ { "function": "pwm_output", "count": 1 } ], "constraints": { "requires_matching_voltage_domain": true }, "description": "PWM output encoding CO2 concentration." }, { "id": "rdy_output", "name": "RDY Output", "protocol": { "type": "digital", "role": "output" }, "requires": [ { "function": "digital_io", "count": 1 } ], "constraints": { "requires_matching_voltage_domain": true }, "description": "Data-ready digital output." }, { "id": "mode_select_input", "name": "SEL Mode Select", "protocol": { "type": "digital", "role": "input" }, "requires": [ { "function": "digital_io", "count": 1 } ], "constraints": { "requires_matching_voltage_domain": true }, "description": "SEL pin selects I2C vs Modbus/UART mode." } ], "supply_voltage_V": [ 3.3, 5.5 ], "pin_count": 7, "metadata": { "i2c_address_7bit": "0x61", "co2_range_ppm": [ 400, 10000 ], "co2_max_detectable_ppm": 40000, "co2_accuracy_ppm_plus_percent": { "offset_ppm": 30, "percent_of_reading": 3 }, "measurement_interval_s": [ 2, 1800 ], "avg_current_mA": 19, "peak_current_mA": 75, "uart_default_baud": 19200 } }, { "domain": "thermal", "resources": [], "interfaces": [], "operating_temperature_C": [ 0, 50 ] }, { "domain": "mechanical", "package_type": "Sensor Module", "dimensions_mm": { "length": 35, "width": 23, "height": 7 }, "resources": [], "interfaces": [] } ], "design_rules": [ "Set SEL low for I2C mode or high for Modbus/UART mode before operation.", "Use I2C bus speed at or below 100 kHz as specified for SCD30 I2C operation.", "Allow periodic exposure to fresh-air baseline conditions when using automatic self-calibration." ], "usage_notes": "SCD30 combines NDIR CO2 sensing with on-module RH/T compensation. It is intended for indoor air quality, ventilation demand control, and environmental monitoring applications.", "application_examples": [ "Indoor air quality monitor", "HVAC demand-controlled ventilation", "Greenhouse CO2 monitoring", "Building automation telemetry node" ], "warnings": [ "SEL must not exceed 4 V and should not be left floating.", "For I2C operation above 3 V, account for level shifting and board pull-up interactions.", "Avoid condensation and severe contamination; long-term accuracy depends on proper calibration strategy." ] }