[Solved] Connecting 3 ENV units via 1 to 3 Hub to M5 Stack



  • @thbonk actually , the ENV Unit build-in two sensor IC. they I2C address is DHT12(0x5C) , BMP280(0x76), i saw your code. you was only define a 0x76 , but it is the BMP280 I2C address.



  • @m5stack I only want to read the temperature and the humidity of the sensors connected to the PaHUB.

    The M5Stck was connected to the Base BTC. The PaHUB was connected to the red Grove port and two ENV sensors were connected to channels 0 and 1 of the PaHUB. I then installed my application, but the ENV sensors connected to the PaHUB didn't deliver any values. When I queried the channels 2-5 of PaHUB I received values, but all were the same.

    So I disconnected the M5Stack from the Base BTC; afterwards I received the temperature and humidity of the two ENV sensors connected to channels 0 and 1 of the PaHUB.

    Is it somehow possible to connect the M5Stack to the Base BTC but read the sensors connected to the PaHUB? Or do I need the PbHUB to achieve this?

    Best regards
    Thomas



  • @thbonk in the I2C bus, you can't use two same address device at the same time. so if you connect the BTC to the BASIC, when the PaHUB switch channal select ENV Unit, it will working not normal. beacuse BTC and ENV all used DHT12, also has same I2C address



  • I keep finding this thread whenever I search using ENV II over PaHUB, so instead of openning a new one I wanted to continue on this.

    I am new to development boards however I am an experienced platform developer.

    I have a Core2 and I want to use PaHUB and add couple of more units to read. I have no problem reading data via using Wire command over PaHUB like using 4way Relay.

    However, I have no idea how to use BMP and SHT over PaHUB. I have tried combining examples without any luck and tried above without any luck.

    Question is after portselect, how come bmp access to right address? If you can point me to any direcon, I will be grateful.

    Cheers.



  • @world101 so the 1 to 3 Hub is used for 3 different i2C addresses?



  • @roccoskye Yes, the HUB makes it possible to connect more diferent I2C devices to the same port A. They all need to have different I2C addressess. The PaHub makes it possible to connect several sensors with the same I2C address and use them. On a HUB they would conflict and the system would know what sensor you'd be referencing to.



  • @capacious Ah ok thanks. Do you know how to use the 1 to 3 Hub because when i connect 3 devices to the hub i get the error message: Please change unit to other grove. Do I need to select custom ports for these devices?



  • @m5stack said in [Solved] Connecting 3 ENV units via 1 to 3 Hub to M5 Stack:

    0x76

    Hello,
    i get a problem with Pa.HUB i connected to it ENV.III. I get Temp and Hum ok but i get -482827.3 for pressure.
    What is wrong ??



  • @kivlow Hi! I have some experience with the PaHub and ENV sensors.
    Could you post your code (if it is Arduino IDE) or if it is too big, email me?



  • I use UIFlow
    i get weard readings like -482827.3 when connect to pa.hub but connected direct to core 2 ewerything is ok