diff --git a/src/sleep.cpp b/src/sleep.cpp
index c25e3473e..e612b0032 100644
--- a/src/sleep.cpp
+++ b/src/sleep.cpp
@@ -309,8 +309,13 @@ esp_sleep_wakeup_cause_t doLightSleep(uint64_t sleepMsec) // FIXME, use a more r
     // assert(esp_sleep_enable_uart_wakeup(0) == ESP_OK);
 #endif
 #ifdef BUTTON_PIN
+#if SOC_PM_SUPPORT_EXT_WAKEUP
     esp_sleep_enable_ext0_wakeup((gpio_num_t)(config.device.button_gpio ? config.device.button_gpio : BUTTON_PIN),
                                  LOW); // when user presses, this button goes low
+#else
+    esp_sleep_enable_gpio_wakeup();
+    gpio_wakeup_enable((gpio_num_t)BUTTON_PIN, GPIO_INTR_LOW_LEVEL);
+#endif
 #endif
 #if defined(LORA_DIO1) && (LORA_DIO1 != RADIOLIB_NC)
     gpio_wakeup_enable((gpio_num_t)LORA_DIO1, GPIO_INTR_HIGH_LEVEL); // SX126x/SX128x interrupt, active high
diff --git a/variants/ai-c3/platformio.ini b/variants/ai-c3/platformio.ini
index 76ecd9f0f..fbc6b51fa 100644
--- a/variants/ai-c3/platformio.ini
+++ b/variants/ai-c3/platformio.ini
@@ -2,7 +2,13 @@
 extends = esp32c3_base
 board = esp32-c3-devkitm-1
 board_level = extra
-build_flags = 
-  ${esp32_base.build_flags}
+build_flags = ${esp32c3_base.build_flags}
   -D PRIVATE_HW
   -I variants/ai-c3
+; as long as BSEC2 Software Library is not supported remove Sensors from build 
+build_src_filter = ${esp32c3_base.build_src_filter}
+  -<modules/Telemetry/EnvironmentTelemetry.cpp>
+  -<modules/Telemetry/AirQualityTelemetry.cpp>
+  -<modules/Telemetry/Sensor>
+lib_ignore = ${esp32c3_base.lib_ignore}
+  BSEC Software Library
diff --git a/variants/ai-c3/variant.h b/variants/ai-c3/variant.h
index 05f0abb51..2db91ccab 100644
--- a/variants/ai-c3/variant.h
+++ b/variants/ai-c3/variant.h
@@ -1,26 +1,33 @@
-// #define BUTTON_NEED_PULLUP // if set we need to turn on the internal CPU pullup during sleep
+#define HAS_TELEMETRY 0 // as long as BSEC2 is not supported
+#define HAS_SENSOR 0    // as long as BSEC2 is not supported
 
-#define I2C_SDA 8
-#define I2C_SCL 9
+#define SDA 0
+#define SCL 1
+#define I2C_SDA SDA
+#define I2C_SCL SCL
 
-#define BUTTON_PIN 0
+#define BUTTON_PIN 9 // BOOT button
+#define LED_PIN 30   // RGB LED
 
 #define USE_RF95
-#undef RF95_SCK
 #define RF95_SCK 4
-#undef RF95_MISO
 #define RF95_MISO 5
-#undef RF95_MOSI
 #define RF95_MOSI 6
-#undef RF95_NSS
 #define RF95_NSS 7
 
-#define LORA_DIO0 10 // a No connect on the SX1262 module
-#define LORA_DIO1 3  // a No connect on the SX1262 module
+#define LORA_DIO0 10
+#define LORA_DIO1 3
 #define LORA_RESET 2
 
+// WaveShare Core1262-868M
+// https://www.waveshare.com/wiki/Core1262-868M
+#define USE_SX1262
+#define SX126X_CS RF95_NSS
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY 10
+#define SX126X_RESET LORA_RESET
+#define SX126X_E22 // use DIO2 as RF switch
+
+#define HAS_GPS 0
 #undef GPS_RX_PIN
 #undef GPS_TX_PIN
-
-#define HAS_SCREEN 0
-#define HAS_GPS 0