A control circuit for active metasurface based on varactor diode is designed in this paper. By varying the reverse bias voltage on the varactor diode, the designed circuit can regulate the additional ...

The electronics wiring diagram for a Heltec Lora32 V3 with a BME280 environmental sensor is shown below. Note the CN3791 6V MPPT Solar Charger circuit board output is directly connected to the battery ...