05-08-2021, 16:37
Hi Jochen,
Any sensors which use the I2C bus must use very short cables and be placed near the PCB as possible, that isn't an issue, its a design characteristic of the I2C bus, no matter the system.
The MH-Z19B sensor communicates using a serial port not I2C, that's why it can work with cables up to 30cm or even a little more.
As a reference here is a picture of a system using exactly the same set of sensors than you. The SPS30 is under the PCB. Cables are no longer than 10cm.
![[Image: attachment.php?aid=2775]](https://www.meteocercal.info/forum/attachment.php?aid=2775)
Rgs.
PS: VW ID4 GTX, nice car
Any sensors which use the I2C bus must use very short cables and be placed near the PCB as possible, that isn't an issue, its a design characteristic of the I2C bus, no matter the system.
The MH-Z19B sensor communicates using a serial port not I2C, that's why it can work with cables up to 30cm or even a little more.
As a reference here is a picture of a system using exactly the same set of sensors than you. The SPS30 is under the PCB. Cables are no longer than 10cm.
Rgs.
PS: VW ID4 GTX, nice car