Max power for E220 30dB module

[Elija]

Hi.
First of all thank you for all your great work.

I use your tutorials to build a comunication between some vineyards. In each, it is an arduino nano connected to a E220-900T30D and to a relé.

Arduino is powered by a 6V battery, by VIN pin; e220 module is powered by 5V pin of arduino.
I saw, during message is send, that voltage on 5V pin drops for a moment. This is because of massive current consumption of e220 module during transmission.
How i can prevent this voltage drop to improve maximum transmission-power of e220 module?

Maybe I can power e220 module directly from battery, with a dc-dc step-down voltage divider? Or maybe placing a super-capacitor (0.1F, 5.5V) between vcc and gnd of e220 module?
My goal is to offer constant 5.5V power to e220 module.

[Renzo Mischianti]

Hi Elija,
to avoid voltage drops and ensure stable power for your E220-900T30D module, don’t power it from the Arduino’s 5V pin—the onboard regulator can’t supply enough current during transmission.

Instead, use a DC-DC buck converter to step down your 6V battery directly to 5V and power the E220 module from that. Add a large capacitor (470 µF + 0.1 µF) close to the E220’s VCC/GND to handle current spikes.

This setup will provide stable voltage and allow the E220 to transmit at full power without brownouts.

Bye Renzo

[Elija]

Thanks for your reply!

I think you mean:
-470uF electrolitic capacitor;
-0.1uF ceramic capacitor.

Thank you!

[Author]

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