this will be fun to play with
Product Name:
HC-21 Embed WIFI to Serial Port Wireless Module UART
1: working voltage 3.3 V + / - 0.3 V.
2: an average of 420 mw power consumption.
3: work humidity 5% ~ 5% (no condensation).
4: working temperature and 55 ℃ ~ + 125 ℃.
5: overall size 20 mm *37 mm.
6: interface type standard 3.3 VTTL level, UART interface.
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Any progress yet? I connected an HC-05 Bluetooth module to my HC-21, but I cannot get an AT response ...
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