diff --git a/src/strategies/SoftwareBitBang/Timing.h b/src/strategies/SoftwareBitBang/Timing.h
index 5aee5298b6..fa194d2ab3 100644
--- a/src/strategies/SoftwareBitBang/Timing.h
+++ b/src/strategies/SoftwareBitBang/Timing.h
@@ -151,6 +151,17 @@
       #define SWBB_READ_DELAY  -6
     #endif
   #endif
+  #if SWBB_MODE == 3
+  /* Speed: 27.027kBd or 3.378kB/s
+     Not max platform speed but compatible with pro mini 328 mode 3.
+     Tested with 80MHz ESP-01 on GPIO 0 & 2 */
+    #if (F_CPU == 80000000L) || (F_CPU == 160000000L)
+      #define SWBB_BIT_WIDTH   29
+      #define SWBB_BIT_SPACER  80
+      #define SWBB_ACCEPTANCE  40
+      #define SWBB_READ_DELAY  4
+    #endif
+  #endif
 #endif
 
 /* Heltech WiFi LoRa ESP32, generic ESP32 --------------------------------- */