diff --git a/src/bus/i2c.c b/src/bus/i2c.c
index d777187..a2119fb 100644
--- a/src/bus/i2c.c
+++ b/src/bus/i2c.c
@@ -502,7 +502,7 @@ word I2C_ADS1115_Read(int channel)
 	// 110  |  ±0.256 V
 	// 111  |  ±0.256 V
 
-	gain = 0x0400; // 2.048 V     |  00000100 00000000
+	gain = 0x0000; // 6.144 V     |  00000100 00000000
 
 	// Input multiplexer configuration: These bits
 	// configure the input multiplexer.
diff --git a/src/bus/i2c.h b/src/bus/i2c.h
index 10f0dff..f29c203 100644
--- a/src/bus/i2c.h
+++ b/src/bus/i2c.h
@@ -4,9 +4,9 @@
 #include "common/types.h"
 
 // I2C multiplexer channels
-#define AHT01 0x0  // Upper
+#define AHT01 0x0  // Lower
 #define AHT02 0x1  // Middle
-#define AHT03 0x2  // Lower
+#define AHT03 0x2  // Upper
 
 // ADC channels
 #define ADS01 0x0  // AIN0 GND