Commit f453b27a authored by Thomas Maaß's avatar Thomas Maaß
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# **Powerbank-Supply PCB**
## Summary
The PCB was created with Kicad.
Many powerbanks automatically turn off after a few seconds, when the current becomes too low.
To prevent from turning off, use this PCB parallel to the power supply.
It pulls about 250 mA every 10 seconds for 3 seconds. You can change this times in the code.
Only for use with 5V!
## Compiling
Install avr-gcc and type a simple "make" to compile.
## Programming
You can program the ATtiny with every AVR compatible ISP-programmer. To save space, there is no programming connector on the board. You have to solder wires on the ATtiny:
Pin 8 - VCC
Pin 4 - GND
Pin 6 - MISO
Pin 5 - MOSI
Pin 7 - SCK
Pin 1 - Reset
Install avrdude. Edit the programmer options in the Makefile, then type "make install" to flash.
![powerbank-supply-top](kicad/powerbank-supply-top.png)
![powerbank-supply-bottom](kicad/powerbank-supply-bottom.png)
# Makefile for programming AVR Devices
MCU = attiny85
FREQ = 1000000
FUSES = -U lfuse:w:0x62:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m
PROGRAMMER = atmelice_isp
PORT = usb
TARGET = main
SRC = $(TARGET).c
ASRC =
OBJ = $(SRC:.c=.o) $(ASRC:.S=.o)
AVRDUDE = avrdude -c $(PROGRAMMER) -p $(MCU) -P $(PORT)
CC = avr-gcc -DF_CPU=$(FREQ) -mmcu=$(MCU)
CFLAGS = -c -Os
ASFLAGS = -c -Os -x assembler-with-cpp
LDFLAGS =
all: hex eeprom
hex: $(TARGET).hex
eeprom: $(TARGET).eep
%.hex: %.elf
avr-objcopy -O ihex -j .data -j .text $(TARGET).elf $(TARGET).hex
%.eep: %.elf
avr-objcopy -O ihex -j .eeprom --change-section-lma .eeprom=0 $(TARGET).elf $(TARGET).eep
%.elf: $(OBJ)
$(CC) $(LDFLAGS) $(OBJ) -o $@
%.o : %.c
$(CC) $(CFLAGS) $< -o $@
%.o : %.S
$(CC) $(ASFLAGS) -c $< -o $@
%.s : %.c
$(CC) $(CFLAGS) -S $< -o $@
size:
avr-size --mcu=$(MCU) -C $(TARGET).elf
install: program fuse
program:
$(AVRDUDE) -U flash:w:$(TARGET).hex -U eeprom:w:$(TARGET).eep
fuse:
$(AVRDUDE) $(FUSES)
clean:
rm -rf *.o
rm -rf *.elf
rm -rf *.hex
rm -rf *.eep
#include <avr/io.h>
#include <util/delay.h>
int main(void) {
DDRB = 0x01;
PORTB = 0x3e;
while(1) {
PORTB |= (1 << PB0);
_delay_ms(3000);
PORTB &= ~(1 << PB0);
_delay_ms(10000);
}
return 0;
}
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This diff is collapsed.
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