External Antenna for ESP8266

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Introduction: External Antenna for ESP8266

Sometimes you need an external antenna for the ESP8266.

For example you want to install the ESP into a metall box for some outside or other applications which is installed in cases. Or you only need a more signal strength. Therefor you need to install a WLAN Antenna connections. But most of the ESP don´t have a small microcoax or similar. So i buyed some WLAN Antennas for very small amount at the usual shop like "Ebay Bangood Ali etc."

So I started to modify and i want to share a small instructable for modification. For in this case a WEMOS D1 mini.

Step 1: Prepare Wemos D1 Board

First prepare the Wemos Mainboard by cutting off some connections as shown in the pcutre. Be sure that the connection is cut through to get a better signal with the external antenna otherwise the signal doesn´t get better but worsst

Step 2: Soldering the The Cable to the PCB Tracks

After preparations for the cable and the board sold it together like described at the picture. Shield / Screen to ground and the centre-wire to the Antenna track.

Step 3: Check If There Is Not Short Between the Antenna Conection

Please measure to be enshure that there is no short between center and screen.

Step 4: Fix the Antenna Cable

Fix the antenna cable with some hot glue to protect the cable form destroying the connection with bending.

Step 5: Checking for the Success

I uploaded a program to two identical ESP8266 one with our hack one without at the same position. (6m to Access Point). Signal is printed with the internal Arduino instruction Serial.print(WiFi.RSSI()); as you can see the benefit is about 14-16dbm. with a +3dBi antenna. Now you can apply every antennta as you want.

Greeting

DerDani

1 Person Made This Project!

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4 Discussions

0
SidShah2468
SidShah2468

2 months ago

Also i am planning to use MQTT server meaning D1 MINI is going to use my hotspot . Also i have attached external antenna on D1 mini so will it be able to get data at approx 200m?

0
volvodani
volvodani

Reply 2 months ago

As i worte before i depends at you circumstances like line of sight "pollution" of the are at 2.4Ghz and the type of antenna.
So i could not gurantee your 200m.
Greeting
DerDani

1
SidShah2468
SidShah2468

Question 2 months ago on Step 5

can you please say whats the range or by how much times the range is increasing?

0
volvodani
volvodani

Answer 2 months ago

This is always a part of used Antenna.
On youtube there are some "extreme" ranges with line of sight up to 10km.
But in real I tested with a BiQuad and i could enter my friends WLAN at approx 300m range.
Greeting.