diff --git a/Makefile b/Makefile
index d594a6d..9769959 100644
--- a/Makefile
+++ b/Makefile
@@ -47,5 +47,5 @@ bin:  $(PRG).bin
 	$(OBJCOPY) -j .text -j .data -O binary $< $@
 
 install: text
-	uisp -dprog=avr910 -dserial=/dev/ttyS0 -dspeed=115200 -dpart=M8 --erase --upload if=$(PRG).hex
-#	avrdude -p m8 -c butterfly -b 19200 -P /dev/ttyUSB0 -u -e -U flash:w:$(PRG).hex
+#	uisp -dprog=avr910 -dserial=/dev/ttyS0 -dspeed=115200 -dpart=M8 --erase --upload if=$(PRG).hex
+	avrdude -p m8 -c butterfly -b 115200 -P /dev/ttyUSB0 -u -e -U flash:w:$(PRG).hex
diff --git a/lipo-charger.c b/lipo-charger.c
index e34a427..8735b8b 100644
--- a/lipo-charger.c
+++ b/lipo-charger.c
@@ -50,6 +50,7 @@
  */
 #define CH0	PORTC0
 #define CH1	PORTC1
+#define SUMMER	PORTB0
 #define PWM	PORTB1
 
 #define NOP	asm volatile ("nop")
@@ -60,7 +61,7 @@
 
 #define VOLTAGE_CONNECT	 9000
 #define VOLTAGE_CHARGE	12450
-#define CURRENT_CHARGE	16000
+#define CURRENT_CHARGE	17500
 #define CURRENT_READY	 2000
 #define VOLTAGE_REMOVE	 1000
 
@@ -223,6 +224,9 @@ ISR(TIMER0_OVF_vect)
 		lcd_update = 1;
 	}
 
+	static uint16_t beep_timer;
+	beep_timer = (beep_timer +1) & 0x3FF;
+
 	/*
 	 * charge with constant voltage of 12.45V
 	 * and a current limit of 1.6A
@@ -243,6 +247,11 @@ ISR(TIMER0_OVF_vect)
 		TCCR1A &= ~(1<<COM1A1);
 	}
 
+	if (mode == MOD_READY && beep_timer < 0x03)
+		PORTB &= ~(1<<SUMMER);
+	else
+		PORTB |= (1<<SUMMER);
+
 	switch (mode) {
 	case MOD_WAITING:
 		/* start charging when a voltage > 9V is detected (lipo connected) */
@@ -266,7 +275,7 @@ ISR(TIMER0_OVF_vect)
 
 int main(void)
 {
-	DDRB = (1<<CS) | (1<<RS) | (1<<PWM);
+	DDRB = (1<<CS) | (1<<RS) | (1<<PWM) | (1<<SUMMER);
 	DDRD = (LCD_DATA_MASK) | (1<<RW);
 
 	/* Set baud rate 19200 */