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[GH-ISSUE #1422] WiFi doesn't work with LOLIN/WEMOS C3 Mini #1216

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opened 2026-02-28 01:29:04 +03:00 by kerem · 13 comments
kerem commented 2026-02-28 01:29:04 +03:00
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Originally created by @jeffryr on GitHub (May 21, 2022).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1422

Arduino IDE 1.8.19

WiFimanager Branch/Release: 2.0.11-beta

Hardware: ESP32 C3

ESP32 Core Version: 2.0.4 2.0.3

Description

WiFimanager (really WiFi in general) doesn't work with LOLIN/WEMOS C3 Mini due to buggy power circuitry on the board.

Settings in IDE

Module: LOLIN/WEMOS C3 Mini

Debug Messages

Fri May 20 21:59:28 GMT 2022 Debug 2 This is setup_wifi()
*wm:[1] AutoConnect
*wm:[2] ESP32 event handler enabled
*wm:[2] Connecting as wifi client...
*wm:[2] setSTAConfig static ip not set, skipping
*wm:[1] Connecting to SAVED AP: rtn66u24
*wm:[1] connectTimeout not set, ESP waitForConnectResult...
*wm:[2] [EVENT] WIFI_REASON: 2
*wm:[2] [EVENT] WIFI_REASON: 2
...
*wm:[2] [EVENT] WIFI_REASON: 2
*wm:[2] [EVENT] WIFI_REASON: 2
*wm:[2] [EVENT] WIFI_REASON: 201
*wm:[2] [EVENT] WIFI_REASON: NO_AP_FOUND
*wm:[2] Connection result: WL_NO_SSID_AVAIL
*wm:[1] AutoConnect: FAILED
*wm:[2] Starting Config Portal
*wm:[2] AccessPoint set password is VALID
*wm:[2] [EVENT] WIFI_REASON: 202
*wm:[2] Disabling STA
*wm:[2] Enabling AP
*wm:[1] StartAP with SSID: c3minia
*wm:[1] AP IP address: 192.168.4.1
*wm:[2] [CB] _apcallback calling
Fri May 20 22:00:17 GMT 2022 Debug 2 Entered config mode, AP name: 192.168.4.1
Fri May 20 22:00:17 GMT 2022 Debug 2 AP IP address: c3minia
*wm:[1] Starting Web Portal
*wm:[2] HTTP server started
*wm:[2] Config Portal Running, blocking, waiting for clients...
*wm:[2] Portal Timeout In 180 seconds
*wm:[2] Portal Timeout In 178 seconds
*wm:[2] Portal Timeout In 148 seconds
*wm:[2] Portal Timeout In 118 seconds
*wm:[2] Portal Timeout In 88 seconds
*wm:[2] Portal Timeout In 58 seconds
*wm:[2] Portal Timeout In 28 seconds
*wm:[1] config portal has timed out
*wm:[2] shutdownConfigPortal
*wm:[2] restoring usermode STA
*wm:[2] wifi status: WL_DISCONNECTED
*wm:[2] wifi mode: STA
*wm:[2] configportal closed
*wm:[1] config portal exiting
failed to connect and hit timeout
ESP-ROM:esp32c3-api1-20210207
Build:Feb 7 2021
rst:0x3 (RTC_SW_SYS_RST),boot:0xd (SPI_FAST_FLASH_BOOT)
Saved PC:0x40381918
SPIWP:0xee
mode:DIO, clock div:1
load:0x3fcd6100,len:0x438
load:0x403ce000,len:0x90c
load:0x403d0000,len:0x2358
SHA-256 comparison failed:
Calculated: a9753a4fc647c6545c1b919ef08db429130a48592727edca270f1e5a3da0d0a9
Expected: 3bf6ef2cf3b9eefcd4b3c70cc5d1ce5138292d101a5cb1d5db6fbebf081b0a19
Attempting to boot anyway...
entry 0x403ce000

Cause

According to https://www.wemos.cc/en/latest/c3/c3_mini.html#about-wifi

You need set WIFI Tx Power to 8.5dBm to use WIFI.

Workaround

The following patch works arround the issue without affecting other boards:

*** WiFiManager.cpp.ORIGINAL	2022-04-14 14:02:05.000000000 -0400
--- WiFiManager.cpp	2022-05-20 18:19:25.599206924 -0400
***************
*** 483,488 ****
--- 483,492 ----
        ret = WiFi.softAP(_apName.c_str(),"",1,_apHidden);
      }  
    }
+   #ifdef ARDUINO_LOLIN_C3_MINI
+     DEBUG_WM(F("Reducing WiFi Tx Power for Lolin C3 mini"));
+     WiFi.setTxPower(WIFI_POWER_8_5dBm);
+   #endif
  
    if(_debugLevel >= DEBUG_DEV) debugSoftAPConfig();
  
***************
*** 1053,1058 ****
--- 1057,1066 ----
    WiFi_enableSTA(true,storeSTAmode); // storeSTAmode will also toggle STA on in default opmode (persistent) if true (default)
    WiFi.persistent(true);
    ret = WiFi.begin(ssid.c_str(), pass.c_str(), 0, NULL, connect);
+   #ifdef ARDUINO_LOLIN_C3_MINI
+     DEBUG_WM(F("Reducing WiFi Tx Power for Lolin C3 mini"));
+     WiFi.setTxPower(WIFI_POWER_8_5dBm);
+   #endif
    WiFi.persistent(false);
    #ifdef WM_DEBUG_LEVEL
    if(!ret) DEBUG_WM(DEBUG_ERROR,F("[ERROR] wifi begin failed"));
***************
*** 1082,1087 ****
--- 1090,1099 ----
    #endif
  
    ret = WiFi.begin();
+   #ifdef ARDUINO_LOLIN_C3_MINI
+     DEBUG_WM(F("Reducing WiFi Tx Power for Lolin C3 mini"));
+     WiFi.setTxPower(WIFI_POWER_8_5dBm);
+   #endif
  
    #ifdef WM_DEBUG_LEVEL
    if(!ret) DEBUG_WM(DEBUG_ERROR,F("[ERROR] wifi begin failed"));
Originally created by @jeffryr on GitHub (May 21, 2022). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1422 Arduino IDE 1.8.19 WiFimanager Branch/Release: 2.0.11-beta Hardware: ESP32 C3 ESP32 Core Version: ~~2.0.4~~ 2.0.3 ### Description WiFimanager (really WiFi in general) doesn't work with LOLIN/WEMOS C3 Mini due to buggy power circuitry on the board. ### Settings in IDE Module: LOLIN/WEMOS C3 Mini ### Debug Messages Fri May 20 21:59:28 GMT 2022 Debug 2 This is setup_wifi() *wm:[1] AutoConnect *wm:[2] ESP32 event handler enabled *wm:[2] Connecting as wifi client... *wm:[2] setSTAConfig static ip not set, skipping *wm:[1] Connecting to SAVED AP: rtn66u24 *wm:[1] connectTimeout not set, ESP waitForConnectResult... *wm:[2] [EVENT] WIFI_REASON: 2 *wm:[2] [EVENT] WIFI_REASON: 2 ... *wm:[2] [EVENT] WIFI_REASON: 2 *wm:[2] [EVENT] WIFI_REASON: 2 *wm:[2] [EVENT] WIFI_REASON: 201 *wm:[2] [EVENT] WIFI_REASON: NO_AP_FOUND *wm:[2] Connection result: WL_NO_SSID_AVAIL *wm:[1] AutoConnect: FAILED *wm:[2] Starting Config Portal *wm:[2] AccessPoint set password is VALID *wm:[2] [EVENT] WIFI_REASON: 202 *wm:[2] Disabling STA *wm:[2] Enabling AP *wm:[1] StartAP with SSID: c3minia *wm:[1] AP IP address: 192.168.4.1 *wm:[2] [CB] _apcallback calling Fri May 20 22:00:17 GMT 2022 Debug 2 Entered config mode, AP name: 192.168.4.1 Fri May 20 22:00:17 GMT 2022 Debug 2 AP IP address: c3minia *wm:[1] Starting Web Portal *wm:[2] HTTP server started *wm:[2] Config Portal Running, blocking, waiting for clients... *wm:[2] Portal Timeout In 180 seconds *wm:[2] Portal Timeout In 178 seconds *wm:[2] Portal Timeout In 148 seconds *wm:[2] Portal Timeout In 118 seconds *wm:[2] Portal Timeout In 88 seconds *wm:[2] Portal Timeout In 58 seconds *wm:[2] Portal Timeout In 28 seconds *wm:[1] config portal has timed out *wm:[2] shutdownConfigPortal *wm:[2] restoring usermode STA *wm:[2] wifi status: WL_DISCONNECTED *wm:[2] wifi mode: STA *wm:[2] configportal closed *wm:[1] config portal exiting failed to connect and hit timeout ESP-ROM:esp32c3-api1-20210207 Build:Feb 7 2021 rst:0x3 (RTC_SW_SYS_RST),boot:0xd (SPI_FAST_FLASH_BOOT) Saved PC:0x40381918 SPIWP:0xee mode:DIO, clock div:1 load:0x3fcd6100,len:0x438 load:0x403ce000,len:0x90c load:0x403d0000,len:0x2358 SHA-256 comparison failed: Calculated: a9753a4fc647c6545c1b919ef08db429130a48592727edca270f1e5a3da0d0a9 Expected: 3bf6ef2cf3b9eefcd4b3c70cc5d1ce5138292d101a5cb1d5db6fbebf081b0a19 Attempting to boot anyway... entry 0x403ce000 ### Cause According to https://www.wemos.cc/en/latest/c3/c3_mini.html#about-wifi **You need set WIFI Tx Power to 8.5dBm to use WIFI.** ### Workaround The following patch works arround the issue without affecting other boards: ``` *** WiFiManager.cpp.ORIGINAL 2022-04-14 14:02:05.000000000 -0400 --- WiFiManager.cpp 2022-05-20 18:19:25.599206924 -0400 *************** *** 483,488 **** --- 483,492 ---- ret = WiFi.softAP(_apName.c_str(),"",1,_apHidden); } } + #ifdef ARDUINO_LOLIN_C3_MINI + DEBUG_WM(F("Reducing WiFi Tx Power for Lolin C3 mini")); + WiFi.setTxPower(WIFI_POWER_8_5dBm); + #endif if(_debugLevel >= DEBUG_DEV) debugSoftAPConfig(); *************** *** 1053,1058 **** --- 1057,1066 ---- WiFi_enableSTA(true,storeSTAmode); // storeSTAmode will also toggle STA on in default opmode (persistent) if true (default) WiFi.persistent(true); ret = WiFi.begin(ssid.c_str(), pass.c_str(), 0, NULL, connect); + #ifdef ARDUINO_LOLIN_C3_MINI + DEBUG_WM(F("Reducing WiFi Tx Power for Lolin C3 mini")); + WiFi.setTxPower(WIFI_POWER_8_5dBm); + #endif WiFi.persistent(false); #ifdef WM_DEBUG_LEVEL if(!ret) DEBUG_WM(DEBUG_ERROR,F("[ERROR] wifi begin failed")); *************** *** 1082,1087 **** --- 1090,1099 ---- #endif ret = WiFi.begin(); + #ifdef ARDUINO_LOLIN_C3_MINI + DEBUG_WM(F("Reducing WiFi Tx Power for Lolin C3 mini")); + WiFi.setTxPower(WIFI_POWER_8_5dBm); + #endif #ifdef WM_DEBUG_LEVEL if(!ret) DEBUG_WM(DEBUG_ERROR,F("[ERROR] wifi begin failed")); ```
kerem commented 2026-02-28 01:29:05 +03:00
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@tablatronix commented on GitHub (May 21, 2022):

Can you provide a link to where it mentions this? I didn't see anything.

I will see if there is a way to set this via build flags also that would be ideal for boards files.

<!-- gh-comment-id:1133667501 --> @tablatronix commented on GitHub (May 21, 2022): Can you provide a link to where it mentions this? I didn't see anything. I will see if there is a way to set this via build flags also that would be ideal for boards files.
kerem commented 2026-02-28 01:29:05 +03:00
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@tablatronix commented on GitHub (May 21, 2022):

Oh nm, I see thats all it says, not why. Do you know the actual cause, hardware bug that a extra capacitor doesnt fix?

<!-- gh-comment-id:1133667759 --> @tablatronix commented on GitHub (May 21, 2022): Oh nm, I see thats all it says, not why. Do you know the actual cause, hardware bug that a extra capacitor doesnt fix?
kerem commented 2026-02-28 01:29:05 +03:00
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@tablatronix commented on GitHub (May 21, 2022):

Since this seems to have to be set after wifi setups, why not just keep this in usercode?

if(autoconect() == true or isConnected etc..){ setpower }

wm.setAPCallback(configModeCallback);
configModeCallback(){ setpower }
<!-- gh-comment-id:1133777107 --> @tablatronix commented on GitHub (May 21, 2022): Since this seems to have to be set after wifi setups, why not just keep this in usercode? ```c++ if(autoconect() == true or isConnected etc..){ setpower } wm.setAPCallback(configModeCallback); configModeCallback(){ setpower } ```
kerem commented 2026-02-28 01:29:05 +03:00
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@jeffryr commented on GitHub (May 22, 2022):

I tried putting the setpower in configModeCallback(), no go. See https://github.com/arendst/Tasmota/discussions/15443 for some more discussion. I purchased a few of the Wemos C3 Mini's along with the https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/hw-reference/esp32c3/user-guide-devkitm-1.html to get some experience with the RiscV flavor of the ESP32. The Espressif board works fine, the Wemos board not so much, not one of their better efforts...

EDIT

I should mention you really need ESP32 2.0.3 (or higher) to get any of the C3 boards to work properly with both USB and wifi simultaneously, see https://github.com/espressif/arduino-esp32/issues/6264#issuecomment-1040147331 for details.

<!-- gh-comment-id:1133925490 --> @jeffryr commented on GitHub (May 22, 2022): I tried putting the setpower in configModeCallback(), no go. See https://github.com/arendst/Tasmota/discussions/15443 for some more discussion. I purchased a few of the Wemos C3 Mini's along with the https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/hw-reference/esp32c3/user-guide-devkitm-1.html to get some experience with the RiscV flavor of the ESP32. The Espressif board works fine, the Wemos board not so much, not one of their better efforts... ### EDIT I should mention you really need ESP32 2.0.3 (or higher) to get any of the C3 boards to work properly with both USB and wifi simultaneously, see https://github.com/espressif/arduino-esp32/issues/6264#issuecomment-1040147331 for details.
kerem commented 2026-02-28 01:29:05 +03:00
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@tablatronix commented on GitHub (May 22, 2022):

Hmm interesting. Ill check the esp docs.

<!-- gh-comment-id:1133954063 --> @tablatronix commented on GitHub (May 22, 2022): Hmm interesting. Ill check the esp docs.
kerem commented 2026-02-28 01:29:05 +03:00
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@ericvrp commented on GitHub (Jun 5, 2022):

I probably have something similar while trying to use the WiFi of the Wemos C3 Mini.
I do not set the 8.5dBm tx power (because I don't know how from Rust) but always get this whenever I try to scan or connect with wifi:

I (2492) wifi_init: tcp tx win: 5744
I (2492) wifi_init: tcp rx win: 5744
I (2502) wifi_init: tcp mss: 1440
I (2502) wifi_init: WiFi IRAM OP enabled
I (2512) wifi_init: WiFi RX IRAM OP enabled
wifi_test() scan...
I (2522) phy_init: phy_version 909,aa05aec,Apr 16 2022,13:42:08
Error: 
  × Broken pipe
<!-- gh-comment-id:1146850528 --> @ericvrp commented on GitHub (Jun 5, 2022): I probably have something similar while trying to use the WiFi of the Wemos C3 Mini. I do not set the 8.5dBm tx power (because I don't know how from Rust) but always get this whenever I try to scan or connect with wifi: ``` I (2492) wifi_init: tcp tx win: 5744 I (2492) wifi_init: tcp rx win: 5744 I (2502) wifi_init: tcp mss: 1440 I (2502) wifi_init: WiFi IRAM OP enabled I (2512) wifi_init: WiFi RX IRAM OP enabled wifi_test() scan... I (2522) phy_init: phy_version 909,aa05aec,Apr 16 2022,13:42:08 Error: × Broken pipe ```
kerem commented 2026-02-28 01:29:05 +03:00
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@jeffryr commented on GitHub (Jun 7, 2022):

I probably have something similar while trying to use the WiFi of the Wemos C3 Mini. I do not set the 8.5dBm tx power (because I don't know how from Rust) but always get this whenever I try to scan or connect with wifi:

I (2492) wifi_init: tcp tx win: 5744
I (2492) wifi_init: tcp rx win: 5744
I (2502) wifi_init: tcp mss: 1440
I (2502) wifi_init: WiFi IRAM OP enabled
I (2512) wifi_init: WiFi RX IRAM OP enabled
wifi_test() scan...
I (2522) phy_init: phy_version 909,aa05aec,Apr 16 2022,13:42:08
Error: 
  × Broken pipe

Not a Rust user (introduced to C/unix in 1977 and it is still my native language) but if you are using https://github.com/esp-rs/esp-wifi for WiFi it supports the esp_wifi_set_max_tx_power() function from the SDK. Search for set_max_tx_power in https://github.com/esp-rs/esp-wifi/blob/main/src/binary/include_esp32c3.rs. Calling esp_wifi_set_max_tx_power(34) in the right part of your code should correspond to 8.5dBm.

<!-- gh-comment-id:1148828543 --> @jeffryr commented on GitHub (Jun 7, 2022): > I probably have something similar while trying to use the WiFi of the Wemos C3 Mini. I do not set the 8.5dBm tx power (because I don't know how from Rust) but always get this whenever I try to scan or connect with wifi: > > ``` > I (2492) wifi_init: tcp tx win: 5744 > I (2492) wifi_init: tcp rx win: 5744 > I (2502) wifi_init: tcp mss: 1440 > I (2502) wifi_init: WiFi IRAM OP enabled > I (2512) wifi_init: WiFi RX IRAM OP enabled > wifi_test() scan... > I (2522) phy_init: phy_version 909,aa05aec,Apr 16 2022,13:42:08 > Error: > × Broken pipe > ``` Not a Rust user (introduced to C/unix in 1977 and it is still my native language) but if you are using https://github.com/esp-rs/esp-wifi for WiFi it supports the esp_wifi_set_max_tx_power() function from the SDK. Search for set_max_tx_power in https://github.com/esp-rs/esp-wifi/blob/main/src/binary/include_esp32c3.rs. Calling esp_wifi_set_max_tx_power(34) in the right part of your code should correspond to 8.5dBm.
kerem commented 2026-02-28 01:29:05 +03:00
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@tablatronix commented on GitHub (Jun 7, 2022):

The docs say you have to esp_wifi_set_max_tx_power after wifi start. so no reason for this to be in wm code at all or even need a callback to do it.

<!-- gh-comment-id:1148915986 --> @tablatronix commented on GitHub (Jun 7, 2022): The docs say you have to `esp_wifi_set_max_tx_power` after wifi start. so no reason for this to be in wm code at all or even need a callback to do it.
kerem commented 2026-02-28 01:29:05 +03:00
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@jeffryr commented on GitHub (Jun 12, 2022):

The docs say you have to esp_wifi_set_max_tx_power after wifi start. so no reason for this to be in wm code at all or even need a callback to do it.

Verified the following works both for initial configuration (no previous AP setup) as well as reboot when AP has been previously saved using stock WiFi Manager version v2.0.11-beta . My setup_wifi() function now uses the following startup sequence:

void setup_wifi() {
  D(debug(2, F("This is %s()"), __FUNCTION__));
#if defined(ESP32)
  int TxPower;
  WiFi.setHostname(defaults.hostname); // Has to happen before WiFi.begin()
#endif
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP
#if defined(ARDUINO_LOLIN_C3_MINI)
  D(debug(2, F("Reducing WiFi Tx Power for Lolin C3 mini")));
  WiFi.setTxPower(WIFI_POWER_8_5dBm);
#endif
  // Reset saved settings for testing
  // wifiManager.resetSettings();
  // Set callback so we know that we entered the Access Portal
  wifiManager.setAPCallback(configModeCallback);
  // Set timeout until configuration portal gets turned off
  wifiManager.setTimeout(180);
  // Configure WiFi if necessary
  if (!wifiManager.autoConnect(defaults.hostname, http_password)) {
    Serial.println(F("failed to connect and hit timeout"));
    delay(3000);
    // reset and try again, or maybe put it to deep sleep
#if defined(ESP8266)
    ESP.reset();
#else
    ESP.restart();
#endif
    delay(5000);
  }
  WiFi.printDiag(Serial);
#if defined(ESP8266)
  wifi_station_set_hostname(defaults.hostname);
  D(debug(3, F("hostname: %s"), wifi_station_get_hostname()));
#elif defined(ESP32)
  D(debug(3, F("hostname: %s"), WiFi.getHostname()));
  WiFi.setSleep(false); // See https://github.com/espressif/arduino-esp32/issues/4855
#else
# error "Tested on ESP8266 and ESP32 only"
#endif
  ip = WiFi.localIP().toString();
  D(debug(3, F("IP address: %s"), ip.c_str()));
  mac = WiFi.macAddress();
  D(debug(3, F("MAC Addr: %s"), mac.c_str()));
  ssid = WiFi.SSID();
  D(debug(3, F("SSID: %s"), ssid.c_str()));
  gatewayip = WiFi.gatewayIP().toString();
  D(debug(3, F("Gateway IP: %s"), gatewayip.c_str()));
  rssi = WiFi.RSSI();  // Point in time
  D(debug(3, F("Current RSSI: %d"), rssi));
  display_wifiip(WiFi.localIP().toString());
#if defined(ESP32)
  TxPower = WiFi.getTxPower();
  D(debug(3, F("TxPower (raw): %d"), TxPower));
#endif // ESP32
  while (!MDNS.begin(defaults.hostname)) {
    D(debug(1, F("Error setting up mDNS responder!")));
    for (int i = 0; i < 20; i++) {
      Serial.print(".");
      delay(100);
    }
    Serial.println(".");
  }
  D(debug(2, F("mDNS responder started")));
}

Recommend this issue can be closed with a documentation note that WiFi TX power needs to be reduced for the C3 Mini prior to calling WiFiManager.

<!-- gh-comment-id:1153223750 --> @jeffryr commented on GitHub (Jun 12, 2022): > The docs say you have to `esp_wifi_set_max_tx_power` after wifi start. so no reason for this to be in wm code at all or even need a callback to do it. Verified the following works both for initial configuration (no previous AP setup) as well as reboot when AP has been previously saved using stock WiFi Manager version v2.0.11-beta . My setup_wifi() function now uses the following startup sequence: ```C++ void setup_wifi() { D(debug(2, F("This is %s()"), __FUNCTION__)); #if defined(ESP32) int TxPower; WiFi.setHostname(defaults.hostname); // Has to happen before WiFi.begin() #endif WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP #if defined(ARDUINO_LOLIN_C3_MINI) D(debug(2, F("Reducing WiFi Tx Power for Lolin C3 mini"))); WiFi.setTxPower(WIFI_POWER_8_5dBm); #endif // Reset saved settings for testing // wifiManager.resetSettings(); // Set callback so we know that we entered the Access Portal wifiManager.setAPCallback(configModeCallback); // Set timeout until configuration portal gets turned off wifiManager.setTimeout(180); // Configure WiFi if necessary if (!wifiManager.autoConnect(defaults.hostname, http_password)) { Serial.println(F("failed to connect and hit timeout")); delay(3000); // reset and try again, or maybe put it to deep sleep #if defined(ESP8266) ESP.reset(); #else ESP.restart(); #endif delay(5000); } WiFi.printDiag(Serial); #if defined(ESP8266) wifi_station_set_hostname(defaults.hostname); D(debug(3, F("hostname: %s"), wifi_station_get_hostname())); #elif defined(ESP32) D(debug(3, F("hostname: %s"), WiFi.getHostname())); WiFi.setSleep(false); // See https://github.com/espressif/arduino-esp32/issues/4855 #else # error "Tested on ESP8266 and ESP32 only" #endif ip = WiFi.localIP().toString(); D(debug(3, F("IP address: %s"), ip.c_str())); mac = WiFi.macAddress(); D(debug(3, F("MAC Addr: %s"), mac.c_str())); ssid = WiFi.SSID(); D(debug(3, F("SSID: %s"), ssid.c_str())); gatewayip = WiFi.gatewayIP().toString(); D(debug(3, F("Gateway IP: %s"), gatewayip.c_str())); rssi = WiFi.RSSI(); // Point in time D(debug(3, F("Current RSSI: %d"), rssi)); display_wifiip(WiFi.localIP().toString()); #if defined(ESP32) TxPower = WiFi.getTxPower(); D(debug(3, F("TxPower (raw): %d"), TxPower)); #endif // ESP32 while (!MDNS.begin(defaults.hostname)) { D(debug(1, F("Error setting up mDNS responder!"))); for (int i = 0; i < 20; i++) { Serial.print("."); delay(100); } Serial.println("."); } D(debug(2, F("mDNS responder started"))); } ``` Recommend this issue can be closed with a documentation note that WiFi TX power needs to be reduced for the C3 Mini prior to calling WiFiManager.
kerem commented 2026-02-28 01:29:05 +03:00
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@tablatronix commented on GitHub (Jun 12, 2022):

hmm i forgot about ap mode, let me make sure there is a way to do this then

<!-- gh-comment-id:1153240445 --> @tablatronix commented on GitHub (Jun 12, 2022): hmm i forgot about ap mode, let me make sure there is a way to do this then
kerem commented 2026-02-28 01:29:05 +03:00
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@popy2k14 commented on GitHub (May 9, 2025):

!!!!!! WARNING FROM LOLIN C3 MINI !!!!!!
!!!!!! WARNING FROM LOLIN C3 MINI !!!!!!
!!!!!! WARNING FROM LOLIN C3 MINI !!!!!!
!!!!!! WARNING FROM LOLIN C3 MINI !!!!!!

Those boards have serious wifi issues!!!!!!
Replaced my 8266 wemos d1 mini with them and none of those connect to wifi!
Tried 7 of them, all have the same issue.
There are a lot of issues, see those links. There are other users which warns from thos boards:

https://github.com/tzapu/WiFiManager/issues/1422
https://github.com/esphome/issues/issues/4893
https://github.com/arendst/Tasmota/discussions/15443

I have bought v2.1.0 and also v2.1.0 those have the issues!
Will try to get a refund!

<!-- gh-comment-id:2867765818 --> @popy2k14 commented on GitHub (May 9, 2025): !!!!!! WARNING FROM LOLIN C3 MINI !!!!!! !!!!!! WARNING FROM LOLIN C3 MINI !!!!!! !!!!!! WARNING FROM LOLIN C3 MINI !!!!!! !!!!!! WARNING FROM LOLIN C3 MINI !!!!!! Those boards have serious wifi issues!!!!!! Replaced my 8266 wemos d1 mini with them and none of those connect to wifi! Tried 7 of them, all have the same issue. There are a lot of issues, see those links. There are other users which warns from thos boards: https://github.com/tzapu/WiFiManager/issues/1422 https://github.com/esphome/issues/issues/4893 https://github.com/arendst/Tasmota/discussions/15443 I have bought v2.1.0 and also v2.1.0 those have the issues! Will try to get a refund!
kerem commented 2026-02-28 01:29:05 +03:00
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@DB9JG commented on GitHub (May 9, 2025):

These boards often suffer from a very bad designed and mismatched WiFi antenna circuit which even triggers the internal protection circuit.
An antenna mod helps:
https://peterneufeld.wordpress.com/2025/03/04/esp32-c3-supermini-antenna-modification/

<!-- gh-comment-id:2867781549 --> @DB9JG commented on GitHub (May 9, 2025): These boards often suffer from a very bad designed and mismatched WiFi antenna circuit which even triggers the internal protection circuit. An antenna mod helps: https://peterneufeld.wordpress.com/2025/03/04/esp32-c3-supermini-antenna-modification/
kerem commented 2026-02-28 01:29:05 +03:00
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@popy2k14 commented on GitHub (May 9, 2025):

thx for the info and hint about the mod.
Sadly i dont have space for the antenna.
Wanted to upgrade my ESP8266+SEN0395 which are mounted inside an 3D Printed case.
Those combo running for stable for years.

<!-- gh-comment-id:2867787055 --> @popy2k14 commented on GitHub (May 9, 2025): thx for the info and hint about the mod. Sadly i dont have space for the antenna. Wanted to upgrade my ESP8266+SEN0395 which are mounted inside an 3D Printed case. Those combo running for stable for years.
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