how many floors?
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 how many floors can have the m5stack? 
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 Behold - the M5Stack Tower !Hi Richard, I don't think there is a hard limit on the number of "floors" or "stacks" that can be used with the M5Stack. Behold - the M5Stack Tower below !! Using a total of 9 stacks, including Battery module , Lora module and 5x Proto modules. Note there are some limitations on how the stacks can be used: - I would suggest only using one battery module per stack.
- Some modules use the same GPIO - in this case only one module can be actively used at a time.
- The GPS and SIM modules use the same GPIO - the GPS continually sends data - so here it should not be used in the stack at the same time as GSM module.
  
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 @jimit thank you very much 
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 @jimit 在 how many floors? 中说: Behold - the M5Stack Tower !Note there are some limitations on how the stacks can be used: - I would suggest only using one battery module per stack.
- Some modules use the same GPIO - in this case only one module can be actively used at a time.
- The GPS and SIM modules use the same GPIO - the GPS continually sends data - so here it should not be used in the stack at the same time as GSM module.
  "hack" one of them and move the rx/tx lines to different GPIO's then use serial1 to connect to that module. 
 Then you have 2 serial's and you can use both modules simultaneously.
 When there is will, there is a way :D
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 @calin the bottom stack should be the watch 😂 

