Proxima

A Eurorack module that measures the distance using a VL53L0X Time-of-Flight sensor and converts it into a Control Voltage (CV) for your modular system. Control parameters easily with hand movements in the air.

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Installation

1. Install CircuitPython on the Pico
2. Download this repository
3. "Proxima_R2CV.py" to the Pico
4. Rename "Proxima_R2CV.py" to "code.py" to start the program automatically after connecting the power supply.
5. Copy the contents of the circuit_pytho_libs folder into the lib folder on the Pico

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Features

• Distance range: 2 cm to 20 cm

• CV output: 0 V to 8 V

• Smooth values using a moving average filter

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Schematics for:

• Complete wiring

• LM358 amplifier circuit

• Low-pass filter

are located in the schematics/ folder.

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Estimated Cost

The module can be built from inexpensive components. Approximate prices:

• Raspberry Pi Pico: 5–6 €

• LM358 Op-Amp: 0.50 €

• MCP4725 (12-bit DAC): 3–4 €

• VL53L0X ToF sensor: 4–5 €

• Resistors and capacitors: 1-2 €

• Jumper wires and connectors: 1–2 €

Total: about 15–20 € (depending on supplier and shipping).

text-based complete scheme

1. Pico:

VSYS (Pin 39) to +5v Eurorack

GND (Pin 38) to GND Eurorack

SDA (Pin 6) to SDA from Tof Sensor and DAC

SCL (Pin 7) to SCL from Tof Sensor and DAC

+3.3v (Pin 36) to VCC from Tof Sensor and DAC

2. DAC (MCP4725) and Tof Sensor (VL53L0X)

GND from Tof Sensor and DAC to GND (Pin 3)

3. low-pass filter

Output from DAC through 10kOhm Resistor to branching point A

branching point A through 100nF Capasitor to GND

branching point A to LM358 (Pin 3)

4. Op-Amp (LM358)

LM358 (Pin 4) to GND

LM358 (Pin 8) to +12v Eurorack

LM358 (Pin 2) to branching point B

branching point B through 10kOhm Resistor to GND

branching point B though 10kOhm Resistor and 4.7kOhm Resistor to branching point C

LM358 (Pin 1) to branching point C

branching point C to Output in CV

!Make sure that all grounds are connected to each other.!