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Satellite M138?

This topic has 0 replies, 1 voice, and was last updated 2022-08-25 at 8:14 PM by neilh20.

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- 2022-08-25 at 8:14 PM #17281
  neilh20
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  I wonder if anybody has looked at using transmission via Swarm.space M138 , https://swarm.space/swarm-m138-modem/
  
  There is a kit available through sparkfun
  
  I wonder if anybody has looked at using transmission via Swarm.space M138 , https://swarm.space/swarm-m138-modem/
  
  There is a kit available through sparkfun https://www.sparkfun.com/products/19236 $150
  
  and it looks like its going to be fairly low cost annual subscription of $60/month with a tight coupling of 750messages per month. Since its satellite each message is fixed size of a respectable 192bytes, irrespective of how much actual data is in it. Typically messages are expected to be from remote device to the central “hive”, and there is a limited ACK capability.
  
  The power requirements are pretty amazing at
  
  Voltage 3.0-5.0V, with reference current at 3.3V
  
  Sleep mode: 3.3 V, 80 uA (max)
  
  Receive mode: 3.3 V, 26 mA (typ), 40 mA (max)
  
  Transmit mode: 3.3V, 850 ma (typ), 1000 mA (max)
  
  Getting the readings is via polling, and seems ubidots have a method.
  
  https://help.ubidots.com/en/articles/5901749-plugins-connect-swarm-hive-with-ubidots
  
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