1.9 KiB
1.9 KiB
q3k's Pullstruder
PET bottle recycling machine. Based on the Recreator3d by Joshua R. Taylor, but with a few twists.
Work in progress.
Electronics
Mainboard is a Melzi 'v5.0' with an ATMega1284P. Reused from a TRONXY X1.
Schematic of 2.0: https://reprap.org/mediawiki/images/7/7d/Melzi-circuit.png
EXP connector:
On the mainboard:
PC1 | 1 2 | PA1
PC0 | 3 4 | PA2
PD3 | 5 6 | PA3
PD2 | 7 8 | PA4
VCC | 9 10 | GND
LCD board
| EXP Pin | AVR Pin | AVR Function | Screen board function |
|---|---|---|---|
| 1 | PC1 | I2C SDA | LCD D7 |
| 2 | PA1 | ADC1 | Button Matrix |
| 3 | PC0 | I2C SCL | LCD D6 |
| 4 | PA2 | ADC2 | LCD EN |
| 5 | PD3 | INT1 | LCD D5 |
| 6 | PA3 | ADC3 | LCD RS |
| 7 | PD2 | INT0 | LCD D4 |
| 8 | PA4 | ADC4 | Unused? |
Button Matrix
On the LCD board.
Based on a voltage divider between button(s) pressed and a constant pull-up to VCC.
Resistor to VCC: 4.7k
| Button | Resistor to GND | Voltage when pressed (VCC=5V) | ADC Value |
|---|---|---|---|
| Left | 470 | 0.45V | 93 |
| Down | 1k | 0.87V | 180 |
| Menu | 2.2k | 1.6V | 326 |
| Right | 4.7k | 2.5V | 512 |
| Up | 10k | 3.4V | 697 |
Firmware
In progress, written in Rust. Aims to be purpose-specific and not just a repurposed 3D printer control firmware.