PCB Design with Gas and Environment Sensors


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.
List completed connections
Validate connections
Proceed to layout

R5
Resistance
4.7kΩ
C7
Capacitance
100nF
R6
Resistance
4.7kΩ
U2
C6
Capacitance
100nF
C4
Capacitance
10uF
C3
Capacitance
100nF
C5
Capacitance
100nF
U3
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