nachiketkukade
commented
1 year ago @VaibhavSingh9511 , pls check Antenna Switch Example for how to use multiple antennas
Open VaibhavSingh9511 opened 1 year ago
nachiketkukade
commented
1 year ago @VaibhavSingh9511 , pls check Antenna Switch Example for how to use multiple antennas
VaibhavSingh9511
commented
1 year ago Hello @nachiketkukade Sir. Thank you for the support provided earlier. I will surely try to test that code as well. Last week, I conducted a comparison between the signal strength of a single PCB antenna connected to ESP 32 and a dual antenna connected ESP32 WROOM DA module. The objective of this test was to identify the module with better signal strength for our product.
To conduct this test, we configured the two modules to scan nearby wifi using an ardArduinouino example code. We configured the antennas in the DA module in AUTO mode as per the Arduino ide example code and placed the two modules next to each other.
After flashing the code onto the DA module, we observed that the DA module was able to sense a few extra numbers of wifi networks in comparison to the normal ESP32 with a single PCB-connected antenna. However, there wasn't a significant difference in the RSSI value between both modules (a difference of 10 to 12 RSSI points). We expected a better response from the DA module.
I have attached the images of our serial monitor and a portion of the code for your reference. I would be grateful if you could verify if these are the expected results from the DA module.
Thank you for your guidance and opinion on this matter.
Best regards,
Vaibhav Singh
/*
* This sketch demonstrates how to scan WiFi networks.
* The API is almost the same as with the WiFi Shield library,
* the most obvious difference being the different file you need to include:
*/
#include "WiFi.h"
/* These are the GPIOs connected to the antenna switch on the ESP32-WROOM-DA.
* Both GPIOs are not exposed to the module pins and cannot be used except to
* control the antnnas switch.
*
* For more details, see the datashhet at:
* https://www.espressif.com/sites/default/files/documentation/esp32-wroom-da_datasheet_en.pdf
*/
#define GPIO_ANT1 2 // GPIO for antenna 1
#define GPIO_ANT2 25 // GPIO for antenna 2 (default)
void setup()
{
bool err = false;
Serial.begin(115200);
// Set WiFi to station mode and disconnect from an AP if it was previously connected
WiFi.mode(WIFI_STA);
/* Attention: This is the manual prodecure for the dual antenna configuration.
* If you choose the ESP32-WROOM-DA module from the Tools -> Board, this configuration
* is not necessary!
*
* Set WiFi dual antenna configuration by passing the GPIO and antenna mode for RX ant TX
*/
err = WiFi.setDualAntennaConfig(GPIO_ANT1, GPIO_ANT2, WIFI_RX_ANT_AUTO, WIFI_TX_ANT_AUTO);
/* For more details on how to use this feature, see our docs:
* https://docs.espressif.com/projects/arduino-esp32/en/latest/api/wifi.html
*/
if(err == false) {
Serial.println("Dual Antenna configuration failed!");
} else {
Serial.println("Dual Antenna configuration successfuly done!");
}
WiFi.disconnect();
delay(100);
Serial.println("Setup done");
}
void loop()
{
Serial.println("scan start");
// WiFi.scanNetworks will return the number of networks found
int n = WiFi.scanNetworks();
Serial.println("scan done");
if (n == 0) {
Serial.println("no networks found");
} else {
Serial.print(n);
Serial.println(" networks found");
for (int i = 0; i < n; ++i) {
// Print SSID and RSSI for each network found
Serial.print(i + 1);
Serial.print(": ");
Serial.print(WiFi.SSID(i));
Serial.print(" (");
Serial.print(WiFi.RSSI(i));
Serial.print(")");
Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN)?" ":"*");
delay(10);
}
}
Serial.println("");
// Wait a bit before scanning again
delay(5000);
}For normal ESP32
/*
* This sketch demonstrates how to scan WiFi networks.
* The API is based on the Arduino WiFi Shield library, but has significant changes as newer WiFi functions are supported.
* E.g. the return value of `encryptionType()` different because more modern encryption is supported.
*/
#include "WiFi.h"
void setup()
{
Serial.begin(115200);
// Set WiFi to station mode and disconnect from an AP if it was previously connected.
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
Serial.println("Setup done");
}
void loop()
{
Serial.println("Scan start");
// WiFi.scanNetworks will return the number of networks found.
int n = WiFi.scanNetworks();
Serial.println("Scan done");
if (n == 0) {
Serial.println("no networks found");
} else {
Serial.print(n);
Serial.println(" networks found");
Serial.println("Nr | SSID | RSSI | CH | Encryption");
for (int i = 0; i < n; ++i) {
// Print SSID and RSSI for each network found
Serial.printf("%2d",i + 1);
Serial.print(" | ");
Serial.printf("%-32.32s", WiFi.SSID(i).c_str());
Serial.print(" | ");
Serial.printf("%4d", WiFi.RSSI(i));
Serial.print(" | ");
Serial.printf("%2d", WiFi.channel(i));
Serial.print(" | ");
switch (WiFi.encryptionType(i))
{
case WIFI_AUTH_OPEN:
Serial.print("open");
break;
case WIFI_AUTH_WEP:
Serial.print("WEP");
break;
case WIFI_AUTH_WPA_PSK:
Serial.print("WPA");
break;
case WIFI_AUTH_WPA2_PSK:
Serial.print("WPA2");
break;
case WIFI_AUTH_WPA_WPA2_PSK:
Serial.print("WPA+WPA2");
break;
case WIFI_AUTH_WPA2_ENTERPRISE:
Serial.print("WPA2-EAP");
break;
case WIFI_AUTH_WPA3_PSK:
Serial.print("WPA3");
break;
case WIFI_AUTH_WPA2_WPA3_PSK:
Serial.print("WPA2+WPA3");
break;
case WIFI_AUTH_WAPI_PSK:
Serial.print("WAPI");
break;
default:
Serial.print("unknown");
}
Serial.println();
delay(10);
}
}
Serial.println("");
// Delete the scan result to free memory for code below.
WiFi.scanDelete();
// Wait a bit before scanning again.
delay(5000);
}The objective of this test was to identify the module with better signal strength for our product.
I think you mean receive sensitivity here.
The objective of this test was to identify the module with better signal strength for our product. However, there wasn't a significant difference in the RSSI value between both modules (a difference of 10 to 12 RSSI points). We expected a better response from the DA module.
RSSI is a logarithmic unit, so 10-12 is a significant gain. What is the expectation from the DA module?
Answers checklist.
General issue report
I have been trying to test the signal strength of an ESP 32 Wroom DA module using its dual antenna, but I am unable to set them in auto mode. As in auto mode, the antenna itself will be configured as per the signal strength unavailable. I have tried to do that ( const wifi_ant_config_t ) but I haven't found much of a difference in the RSSI strength between a regular module and a DA module.
Can someone please suggest me how can I configure the antenna correctly? As of now I not really seeing much of a difference between the two, say DA module gives me a better RSSI value by a margin of 5 to 10 Dbi points, which I don't think is much. I have tried to configure the antennas on the DA separately as well as together but the result is almost the same.