Programming the EuroPi

https://github.com/Allen-Synthesis/EuroPi/blob/main/software/programming_instructions.md

Using the smaller version of the Pi Pico

Change pins on europi.py

• I2C OLED pins 0, 1
• Extra I2C pins 2, 3

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14

# Pin assignments
PIN_DIN = 22
PIN_AIN = 26
PIN_K1 = 27
PIN_K2 = 28
PIN_B1 = 4
PIN_B2 = 5
PIN_CV1 = 21
PIN_CV2 = 20
PIN_CV3 = 16
PIN_CV4 = 17
PIN_CV5 = 18
PIN_CV6 = 19
PIN_USB_CONNECTED = 24

Original Pi Pico Pinouts

Pi Pico Super Mini pinout

Edited europi.py pin assignments for Pi Pico Super Mini (to test)

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14

# Pin assignments
PIN_DIN = 6
PIN_AIN = 26
PIN_K1 = 27
PIN_K2 = 28
PIN_B1 = 7
PIN_B2 = 8
PIN_CV1 = 9
PIN_CV2 = 10
PIN_CV3 = 11
PIN_CV4 = 12
PIN_CV5 = 13
PIN_CV6 = 14
PIN_USB_CONNECTED = 24

OLED

• SDA - GP0
• SCL - GP1

Extra I2C pins

• Extra I2C 2, 3

How does the outputs work?

How I understand it:

• The Pi Pico outputs a 100kHz PWM pulse
• The output circuit filters the pulses like a DAC would do it using an RC filter.
• When the pulse width is low (0%) the voltage is low
• When the pulse width is high (100%) the voltage is high

MCP6004 Pinout

VDD = POSITIVE, 5v VSS = NEGATIVE, 0v or GND