diff --git a/platformio.ini b/platformio.ini
index f1ef5b6a..6c43af8c 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -97,6 +97,8 @@ build_flags =
 	-DHOYMILES_PIN_CS=5
 	-DVICTRON_PIN_TX=21
 	-DVICTRON_PIN_RX=22
+    -DPYLONTECH_PIN_RX=27
+    -DPYLONTECH_PIN_TX=14
 
 [env:wt32_eth01]
 ; http://www.wireless-tag.com/portfolio/wt32-eth01/