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Home › Forums › Your projects › Max power for E220 30dB module
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.
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
Thanks for your reply!
I think you mean:
-470uF electrolitic capacitor;
-0.1uF ceramic capacitor.
Thank you!
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