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    Multiple RFID (RC522) reader via Grove Hub

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    • ajb2k3A
      ajb2k3 @falmasi
      last edited by

      @falmasi

      No, all i2c devices need different address.

      UIFlow, so easy an adult can learn it!
      If I don't know it, be patient!
      I've ether not learned it or am too drunk to remember it!
      Author of the WIP UIFlow Handbook!
      M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

      F 1 Reply Last reply Reply Quote 0
      • m5-docsM
        m5-docs @falmasi
        last edited by

        @falmasi
        Hub just for direct connection.

        M5Stack documentation URL

        https://docs.m5stack.com

        1 Reply Last reply Reply Quote 0
        • F
          falmasi @ajb2k3
          last edited by

          @ajb2k3 Thaks, and can I change the default address?

          ajb2k3A 1 Reply Last reply Reply Quote 0
          • ajb2k3A
            ajb2k3 @falmasi
            last edited by

            @falmasi said in Multiple RFID (RC522) reader via Grove Hub:

            @ajb2k3 Thaks, and can I change the default address?

            I don't know as I don't have one.
            I was taking a guess based on i2c protocol.

            UIFlow, so easy an adult can learn it!
            If I don't know it, be patient!
            I've ether not learned it or am too drunk to remember it!
            Author of the WIP UIFlow Handbook!
            M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

            1 Reply Last reply Reply Quote 0
            • m5-docsM
              m5-docs
              last edited by

              It can not be change the iic address. It has been defined by hardware of RFID module in RFID Unit.

              Here's the description about IIC address

              0_1547532220523_TIM截图20190115095742.png

              M5Stack documentation URL

              https://docs.m5stack.com

              ajb2k3A 1 Reply Last reply Reply Quote 0
              • ajb2k3A
                ajb2k3 @m5-docs
                last edited by

                @watson said in Multiple RFID (RC522) reader via Grove Hub:

                It can not be change the iic address. It has been defined by hardware of RFID module in RFID Unit.

                Here's the description about IIC address

                0_1547532220523_TIM截图20190115095742.png

                ah, so in this case, @falmasi will need to use an i2c expander.
                Something like the TCA9548A to use multiple devices on one port.
                link text
                New product idea for M5Stack?

                UIFlow, so easy an adult can learn it!
                If I don't know it, be patient!
                I've ether not learned it or am too drunk to remember it!
                Author of the WIP UIFlow Handbook!
                M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

                F 1 Reply Last reply Reply Quote 0
                • F
                  falmasi @ajb2k3
                  last edited by

                  @ajb2k3
                  We have tried to connect two RFID reader (https://www.aliexpress.com/item/M5Stack-Newest-Mini-RFID-Unit-RC522-Module-Sensor-for-Arduino-SPI-Writer-Reader-IC-Card-with/32963407976.html?spm=2114.search0104.3.1.3f74370dX6jROf&ws_ab_test=searchweb0_0,searchweb201602_4_10065_10068_319_317_10696_10084_453_454_10083_10618_431_10304_10307_10820_10821_537_10302_536_10059_10884_10887_100031_321_322_10103,searchweb201603_54,ppcSwitch_0&algo_expid=9d7bf1a6-ea97-478a-b8e1-8c3779fd0235-0&algo_pvid=9d7bf1a6-ea97-478a-b8e1-8c3779fd0235&transAbTest=ae803_5) with an IO Expander
                  (https://www.aliexpress.com/store/product/M5Stack-Official-Extend-Serial-IO-I-O-Unit-Grove-Cable-I2C-Interface-for-Arduino-Blockly-ESP32/3226069_32966582585.html?spm=a2g1y.12024536.productList_5885013.pic_8) with no success.
                  Should it have to work?
                  Thanks,

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                  • ajb2k3A
                    ajb2k3
                    last edited by

                    No that is an I/O expander NOT an i2c expander.
                    you need an i2c expander like this.
                    link text

                    UIFlow, so easy an adult can learn it!
                    If I don't know it, be patient!
                    I've ether not learned it or am too drunk to remember it!
                    Author of the WIP UIFlow Handbook!
                    M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

                    m5-docsM 1 Reply Last reply Reply Quote 0
                    • m5-docsM
                      m5-docs @ajb2k3
                      last edited by

                      @ajb2k3
                      Thanks guy

                      We'll make this kind of device

                      M5Stack documentation URL

                      https://docs.m5stack.com

                      ajb2k3A 1 Reply Last reply Reply Quote 1
                      • ajb2k3A
                        ajb2k3 @m5-docs
                        last edited by

                        @watson said in Multiple RFID (RC522) reader via Grove Hub:

                        @ajb2k3
                        Thanks guy

                        We'll make this kind of device

                        Lol, I can give you loads of product ideas!

                        UIFlow, so easy an adult can learn it!
                        If I don't know it, be patient!
                        I've ether not learned it or am too drunk to remember it!
                        Author of the WIP UIFlow Handbook!
                        M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

                        m5-docsM 1 Reply Last reply Reply Quote 0
                        • m5-docsM
                          m5-docs @ajb2k3
                          last edited by

                          @ajb2k3
                          Appreciate you!

                          M5Stack documentation URL

                          https://docs.m5stack.com

                          1 Reply Last reply Reply Quote 1
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