From a851a2d646f439f7126c232ba1524c55a8990872 Mon Sep 17 00:00:00 2001 From: Sadeep Madurange Date: Fri, 9 Jan 2026 16:45:56 +0800 Subject: Remove _site from git. --- _site/log/arduino-uno/3v3.Makefile | 46 --------------- _site/log/arduino-uno/Makefile | 43 -------------- _site/log/arduino-uno/breadboard.jpeg | Bin 54319 -> 0 bytes _site/log/arduino-uno/index.html | 108 ---------------------------------- _site/log/arduino-uno/pinout.png | Bin 247197 -> 0 bytes 5 files changed, 197 deletions(-) delete mode 100644 _site/log/arduino-uno/3v3.Makefile delete mode 100644 _site/log/arduino-uno/Makefile delete mode 100644 _site/log/arduino-uno/breadboard.jpeg delete mode 100644 _site/log/arduino-uno/index.html delete mode 100644 _site/log/arduino-uno/pinout.png (limited to '_site/log/arduino-uno') diff --git a/_site/log/arduino-uno/3v3.Makefile b/_site/log/arduino-uno/3v3.Makefile deleted file mode 100644 index 4ca89d4..0000000 --- a/_site/log/arduino-uno/3v3.Makefile +++ /dev/null @@ -1,46 +0,0 @@ -CC = avr-gcc -MCU = atmega328p -PORT = /dev/cuaU0 -TARGET = app - -SRC = main.c -OBJ = $(SRC:.c=.o) - -CFLAGS = -std=gnu99 -CFLAGS += -Os -CFLAGS += -Wall -CFLAGS += -mmcu=$(MCU) -CFLAGS += -DBAUD=57600 -CFLAGS += -DF_CPU=8000000UL -CFLAGS += -ffunction-sections -fdata-sections - -LDFLAGS = -mmcu=$(MCU) -LDFLAGS += -Wl,--gc-sections - -HEX_FLAGS = -O ihex -HEX_FLAGS += -j .text -j .data - -AVRDUDE_FLAGS = -p $(MCU) -AVRDUDE_FLAGS += -c arduino -AVRDUDE_FLAGS += -b 57600 -AVRDUDE_FLAGS += -P $(PORT) -AVRDUDE_FLAGS += -D -U - -%.o: %.c - $(CC) $(CFLAGS) -c -o $@ $< - -elf: $(OBJ) - $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf - -hex: elf - avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex - -upload: hex - avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i - -.PHONY: clean - -clean: - rm -f *.o *.elf *.hex - - diff --git a/_site/log/arduino-uno/Makefile b/_site/log/arduino-uno/Makefile deleted file mode 100644 index 9db7b09..0000000 --- a/_site/log/arduino-uno/Makefile +++ /dev/null @@ -1,43 +0,0 @@ -CC = avr-gcc -MCU = atmega328p -PORT = /dev/cuaU0 -TARGET = app - -SRC = main.c -OBJ = $(SRC:.c=.o) - -CFLAGS = -std=gnu99 -CFLAGS += -Os -CFLAGS += -Wall -CFLAGS += -mmcu=$(MCU) -CFLAGS += -DBAUD=115200 -CFLAGS += -DF_CPU=16000000UL -CFLAGS += -ffunction-sections -fdata-sections - -LDFLAGS = -mmcu=$(MCU) -LDFLAGS += -Wl,--gc-sections - -HEX_FLAGS = -O ihex -HEX_FLAGS += -j .text -j .data - -AVRDUDE_FLAGS = -p $(MCU) -AVRDUDE_FLAGS += -c arduino -AVRDUDE_FLAGS += -P $(PORT) -AVRDUDE_FLAGS += -D -U - -%.o: %.c - $(CC) $(CFLAGS) -c -o $@ $< - -elf: $(OBJ) - $(CC) $(LDFLAGS) $(OBJ) -o $(TARGET).elf - -hex: elf - avr-objcopy $(HEX_FLAGS) $(TARGET).elf $(TARGET).hex - -upload: hex - avrdude $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i - -.PHONY: clean - -clean: - rm *.o *.elf *.hex diff --git a/_site/log/arduino-uno/breadboard.jpeg b/_site/log/arduino-uno/breadboard.jpeg deleted file mode 100644 index bd74907..0000000 Binary files a/_site/log/arduino-uno/breadboard.jpeg and /dev/null differ diff --git a/_site/log/arduino-uno/index.html b/_site/log/arduino-uno/index.html deleted file mode 100644 index 3eee3a3..0000000 --- a/_site/log/arduino-uno/index.html +++ /dev/null @@ -1,108 +0,0 @@ - - - - - - ATmega328P at 3.3V and 5V - - - - - - - - - - - -
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ATMEGA328P AT 3.3V AND 5V

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10 JUNE 2025
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Quick reference for wiring ATmega328P ICs at 5V and 3.3V. 5V uses 16MHz -crystal, 3.3V uses 8MHz.

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Pinout

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Breadboard

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5V-16MHz

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Standard setup. How Arduino Uno boards are wired.

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Connections: Pin 1 → 5V via 10kΩ resistor. Pins 9/10 → 16MHz crystal via 22pF -capacitors to ground. Pins 7/20/21 → 5V supply. Pins 8/22 → ground. Add 0.1μF -decoupling caps between pins 7/20/21 and ground.

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Sample Makefile: Makefile

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3.3V-8MHz

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Electrical connections identical to 5V circuit. Replace 5V with 3.3V supply, -16MHz crystal with 8MHz.

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Problem: ATmega328P ships configured for 5V. Must modify fuses (BOD level, -etc.) and replace bootloader. Standard Arduino bootloader expects 16MHz—needs -8MHz version.

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Solution: Use Arduino Uno as ISP. Upload ‘ArduinoISP’ sketch from Arduino IDE. -Connect SPI pins (ATmega328P ↔ Uno), Uno’s SS pin → ATmega328P RESET pin. Power -ATmega328P from Uno’s 5V pin during programming.

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Arduino IDE: Select ‘ATmega328P (3.3V, 8MHz)’ processor, ‘Arduino as ISP’ -programmer. Burn bootloader via tools menu.

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Sample Makefile (8MHz): Makefile.3v3

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Remarks

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Don’t connect AREF (pin 21) to Vcc if using ADC with internal 1.1V -or AVcc reference. See datasheet section 23.5.2.

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by W. D. Sadeep Madurange

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© ASCIIMX - 2026

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