diff --git a/ds1307/ds1307.go b/ds1307/ds1307.go
index 866bc67..962a7d1 100644
--- a/ds1307/ds1307.go
+++ b/ds1307/ds1307.go
@@ -74,7 +74,7 @@ func (d *Device) Seek(offset int64, whence int) (int64, error) {
 	case 2:
 		whence = SRAMEndAddress
 	default:
-		return 0, errors.New("Invalid starting point")
+		return 0, errors.New("invalid starting point")
 	}
 	d.AddressSRAM = uint8(whence) + uint8(offset)
 	if d.AddressSRAM > SRAMEndAddress {
@@ -87,7 +87,7 @@ func (d *Device) Seek(offset int64, whence int) (int64, error) {
 // returns number of bytes written and error, if any
 func (d *Device) Write(data []byte) (n int, err error) {
 	if int(d.AddressSRAM)+len(data)-1 > SRAMEndAddress {
-		return 0, errors.New("Writing outside of SRAM")
+		return 0, errors.New("writing outside of SRAM")
 	}
 	buffer := make([]byte, len(data)+1)
 	buffer[0] = d.AddressSRAM
diff --git a/gps/ublox.go b/gps/ublox.go
index 1b0a34b..b10f572 100644
--- a/gps/ublox.go
+++ b/gps/ublox.go
@@ -49,5 +49,5 @@ func sendCommand(gpsDevice GPSDevice, command []byte) (err error) {
 			}
 		}
 	}
-	return errors.New("No ACK to GPS command")
+	return errors.New("no ACK to GPS command")
 }
diff --git a/hd44780/gpio.go b/hd44780/gpio.go
index 8f6da9a..e3f3a67 100644
--- a/hd44780/gpio.go
+++ b/hd44780/gpio.go
@@ -87,7 +87,7 @@ func (g *GPIO) write4BitMode(data byte) {
 // Ram address can be changed by writing address in command mode
 func (g *GPIO) Read(data []byte) (n int, err error) {
 	if len(data) == 0 {
-		return 0, errors.New("Length greater than 0 is required")
+		return 0, errors.New("length greater than 0 is required")
 	}
 	g.rw.High()
 	g.reconfigureGPIOMode(machine.PinInput)
diff --git a/hd44780/hd44780.go b/hd44780/hd44780.go
index b7494b0..03f0205 100644
--- a/hd44780/hd44780.go
+++ b/hd44780/hd44780.go
@@ -66,7 +66,7 @@ func (d *Device) Configure(cfg Config) error {
 	d.width = uint8(cfg.Width)
 	d.height = uint8(cfg.Height)
 	if d.width == 0 || d.height == 0 {
-		return errors.New("Width and height must be set")
+		return errors.New("width and height must be set")
 	}
 	memoryMap := uint8(ONE_LINE)
 	if d.height > 1 {
diff --git a/pcd8544/pcd8544.go b/pcd8544/pcd8544.go
index 61580de..23ed294 100644
--- a/pcd8544/pcd8544.go
+++ b/pcd8544/pcd8544.go
@@ -127,7 +127,7 @@ func (d *Device) GetPixel(x int16, y int16) bool {
 func (d *Device) SetBuffer(buffer []byte) error {
 	if int16(len(buffer)) != d.bufferSize {
 		//return ErrBuffer
-		return errors.New("Wrong size buffer")
+		return errors.New("wrong size buffer")
 	}
 	for i := int16(0); i < d.bufferSize; i++ {
 		d.buffer[i] = buffer[i]
diff --git a/ssd1306/ssd1306.go b/ssd1306/ssd1306.go
index 42c2f55..45d722b 100644
--- a/ssd1306/ssd1306.go
+++ b/ssd1306/ssd1306.go
@@ -219,7 +219,7 @@ func (d *Device) GetPixel(x int16, y int16) bool {
 func (d *Device) SetBuffer(buffer []byte) error {
 	if int16(len(buffer)) != d.bufferSize {
 		//return ErrBuffer
-		return errors.New("Wrong size buffer")
+		return errors.New("wrong size buffer")
 	}
 	for i := int16(0); i < d.bufferSize; i++ {
 		d.buffer[i] = buffer[i]