2023-10-11 15:18:08 +00:00
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q3k's Pullstruder
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===
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PET bottle recycling machine. Based on the [Recreator3d](http://recreator3d.com/) by Joshua R. Taylor, but with a few twists.
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Work in progress.
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Electronics
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===
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Mainboard is a Melzi 'v5.0' with an ATMega1284P. Reused from a TRONXY X1.
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Schematic of 2.0: https://reprap.org/mediawiki/images/7/7d/Melzi-circuit.png
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EXP connector:
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----
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2023-10-11 15:21:09 +00:00
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On the mainboard:
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2023-10-11 15:19:49 +00:00
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PC1 | 1 2 | PA1
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PC0 | 3 4 | PA2
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PD3 | 5 6 | PA3
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PD2 | 7 8 | PA4
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VCC | 9 10 | GND
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2023-10-11 15:18:08 +00:00
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LCD board
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2023-10-11 15:21:09 +00:00
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---
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2023-10-11 15:18:08 +00:00
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| EXP Pin | AVR Pin | AVR Function | Screen board function |
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|---------|---------|--------------|-----------------------|
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| 1 | PC1 | I2C SDA | LCD D7 |
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| 2 | PA1 | ADC1 | Button Matrix |
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| 3 | PC0 | I2C SCL | LCD D6 |
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| 4 | PA2 | ADC2 | LCD EN |
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| 5 | PD3 | INT1 | LCD D5 |
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| 6 | PA3 | ADC3 | LCD RS |
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| 7 | PD2 | INT0 | LCD D4 |
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| 8 | PA4 | ADC4 | Unused? |
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Button Matrix
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---
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2023-10-11 15:21:09 +00:00
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On the LCD board.
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2023-10-11 15:18:08 +00:00
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Based on a voltage divider between button(s) pressed and a constant pull-up to VCC.
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Resistor to VCC: 4.7k
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| Button | Resistor to GND | Voltage when pressed (VCC=5V) | ADC Value |
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|--------|-----------------|-------------------------------|-----------|
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| Left | 470 | 0.45V | 93 |
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| Down | 1k | 0.87V | 180 |
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| Menu | 2.2k | 1.6V | 326 |
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| Right | 4.7k | 2.5V | 512 |
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| Up | 10k | 3.4V | 697 |
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Firmware
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===
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In progress, written in Rust. Aims to be purpose-specific and not just a repurposed 3D printer control firmware.
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