Initial import

Author: Jan Knipper

.gitignore

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+/.vscode

Makefile

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+# Makefile for Arduino Nano Quantizer
+# Uses arduino-cli for compilation and upload
+
+# Configuration
+ARDUINO_CLI ?= arduino-cli
+BOARD_FQBN = arduino:avr:nano
+SKETCH_DIR = .
+SKETCH = $(SKETCH_DIR)/eurorack-quantizer-software.ino
+PORT ?= /dev/ttyUSB0
+BAUD_RATE ?= 115200
+
+# Default target
+.PHONY: all
+all: compile
+
+# Compile the sketch
+.PHONY: compile
+compile:
+	@echo "Compiling $(SKETCH)..."
+	$(ARDUINO_CLI) compile -vt --fqbn $(BOARD_FQBN) $(SKETCH_DIR)
+
+# Upload to Arduino
+.PHONY: upload
+upload: compile
+	@echo "Uploading to $(PORT)..."
+	$(ARDUINO_CLI) upload -vt -p $(PORT) --fqbn $(BOARD_FQBN) $(SKETCH_DIR)
+
+# Compile and upload in one step
+.PHONY: build-upload
+build-upload: upload
+
+# Open serial monitor
+.PHONY: monitor
+monitor:
+	@echo "Opening serial monitor on $(PORT)..."
+	$(ARDUINO_CLI) monitor -p $(PORT) --config $(BAUD_RATE)
+
+# Clean build artifacts
+.PHONY: clean
+clean:
+	@echo "Cleaning build artifacts..."
+	rm -rf $(SKETCH_DIR)/build
+
+# List available ports
+.PHONY: ports
+ports:
+	$(ARDUINO_CLI) board list
+
+# Check if arduino-cli is installed
+.PHONY: check
+check:
+	@which $(ARDUINO_CLI) > /dev/null || (echo "Error: $(ARDUINO_CLI) not found. Install it from https://arduino.github.io/arduino-cli/" && exit 1)
+	@echo "✓ $(ARDUINO_CLI) found"
+
+# Help target
+.PHONY: help
+help:
+	@echo "Available targets:"
+	@echo "  make compile      - Compile the sketch"
+	@echo "  make upload       - Compile and upload to Arduino (uses PORT=$(PORT))"
+	@echo "  make build-upload - Same as upload"
+	@echo "  make monitor      - Open serial monitor (uses PORT=$(PORT), BAUD_RATE=$(BAUD_RATE))"
+	@echo "  make ports        - List available serial ports"
+	@echo "  make clean        - Remove build artifacts"
+	@echo "  make check        - Verify arduino-cli is installed"
+	@echo ""
+	@echo "Override PORT: make upload PORT=/dev/ttyACM0"
+	@echo "Override ARDUINO_CLI: make compile ARDUINO_CLI=arduino-cli"
+

README.md

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+# Arduino Quantize & Hold Synthesizer Module
+
+This Arduino based module let’s you quantize and hold a given control voltage. There are controls for selecting different scales and transposing a note. The module can either continuously quantize a given voltage or hold it when triggered. It uses a 12-bit digital-to-analog converter (DAC). It is a great companion for sequencers with unquantized outputs or for quantizing other voltage sources.
+
+[Find more details on my website](https://polykit.rocks/quantizer)
+
+![Eurorack Quantize & Hold Module](eurorack-quantizer-module.jpg)
+
+## Key features
+
+- Quantizer
+- Arduino based, open-source software
+- Scale mode control, also per CV
+- Pass-through mode without quantizing (DAC precision)
+- Control for transposing a note -24 to +24 semitones, also per CV
+- Trigger input for holding a voltage
+- Gate output for voltage changes in continuous mode
+- CV input 0-5V
+- CV output 0-7V (1V/oct)
+- 4HP wide
+
+## Install
+
+To upload or modify the firmware, you’ll need the Arduino IDE (or any compatible toolchain) to compile and flash the code to the microcontroller. There is a Makefile that uses `arduino-cli` to compile and flash your microcontroller.
+
+```
+$ make help
+Available targets:
+  make compile      - Compile the sketch
+  make upload       - Compile and upload to Arduino (uses PORT=/dev/ttyUSB0)
+  make build-upload - Same as upload
+  make monitor      - Open serial monitor (uses PORT=/dev/ttyUSB0, BAUD_RATE=115200)
+  make ports        - List available serial ports
+  make clean        - Remove build artifacts
+  make check        - Verify arduino-cli is installed
+
+Override PORT: make upload PORT=/dev/ttyACM0
+Override ARDUINO_CLI: make compile ARDUINO_CLI=arduino-cli
+```