PCB Design with Gas and Environment Sensors

flux

Your request is to connect all the active devices (the RP2040, CO sensor, CO₂ sensor, and BME280 sensor), along with the necessary passive components, into a unified schematic. The connections include power and ground lines, a shared I²C bus with pull-up resistors, and individual decoupling capacitors for each device.
Below is a structured table outlining the net connections:

Table

From Component (Pin)To Component (Pin)Net Name
RP2040 (IOVDD power pin)All sensor VCC pins (CO sensor, CO₂ sensor, BME280)VCC
RP2040 (GND)All sensor GND pins (CO sensor, CO₂ sensor, BME280)GND
RP2040 (I2C SDA pin)CO Sensor (SDA pin)I2C_SDA
RP2040 (I2C SDA pin)CO₂ Sensor (SDA pin)I2C_SDA
RP2040 (I2C SDA pin)BME280 (SDA pin)I2C_SDA
RP2040 (I2C SCL pin)CO Sensor (SCL pin)I2C_SCL
RP2040 (I2C SCL pin)CO₂ Sensor (SCL pin)I2C_SCL
RP2040 (I2C SCL pin)BME280 (SCL pin)I2C_SCL
R1 (one end)Shared I2C SDA netI2C_SDA
R1 (other end)VCCVCC
R2 (one end)Shared I2C SCL netI2C_SCL
R2 (other end)VCCVCC
C1 (one lead)RP2040 decoupling at power pinVCC
C1 (other lead)RP2040 GNDGND
C2 (one lead)Bulk decoupling: VCCVCC
C2 (other lead)Bulk decoupling: GNDGND
C3 (one lead)CO Sensor decoupling at power pinVCC
C3 (other lead)CO Sensor GNDGND
C4 (one lead)CO₂ Sensor decoupling at power pinVCC
C4 (other lead)CO₂ Sensor GNDGND
C5 (one lead)BME280 decoupling at power pinVCC
C5 (other lead)BME280 GNDGND
All GND-connected nets are tied together to a common reference (using the Ground component).
This table summarizes how to wire the active devices to the RP2040 using the shared I²C interface, while ensuring proper power decoupling and I²C pull-up biasing.
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U3
R5
Resistance
4.7kΩ
C7
Capacitance
100nF
R6
Resistance
4.7kΩ
C6
Capacitance
100nF
C4
Capacitance
10uF
C3
Capacitance
100nF
C5
Capacitance
100nF
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