JDY-40
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The JDY-40 Module might be one of the absolute cheapest way of adding wireless communications capabilities to designs using the STM32. Unlike the NRF24L01 Module, the JDY-40 is operating as a wireless serial modem responding to traditional "AT" commands.
The modules are readily available from online shops like AliExpress or Lazada and they typically cost less than $1 each.
