Arduino UNO + HC-12

Transreceiver 100m

The Arduino Uno is transmitting a message every 1/2 second. Note that the message has a checksum attached. This enables the other module to check that the message has been received correctly. I use a 5v step-down voltage regulator, a 220uF capacitor and 1N4001 diode. The diode drops the voltage from 5v to around 4.5v, so it does not overheat the HC-12. The range of the device (using the wire antenna) is around 100m.

to check transmission quality  here. 5.0 volts

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