diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -69,6 +69,8 @@ Src/stm32f0xx_hal_msp.c \
 Src/stm32f0xx_it.c \
 Src/system_stm32f0xx.c \
 Src/system.c \
+Src/i2c.c \
+Src/sgp30.c \
 hydrobot-sharedlibs/src/can_buffer.c \
 hydrobot-sharedlibs/src/can.c \
 hydrobot-sharedlibs/src/flash.c \
@@ -164,6 +166,9 @@ LDFLAGS = $(MCU) -specs=nano.specs -T$(L
 # default action: build all
 all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).hex $(BUILD_DIR)/$(TARGET).bin
 
+# flash via serial wire debug 
+flash: all
+	st-flash --reset write $(BUILD_DIR)/$(TARGET).bin 0x8000000
 
 #######################################
 # build the application