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Melzi V4
AI Overview
Melzi - RepRap
The Melzi v4 is a legacy all-in-one 3D printer controller board frequently used in Wanhao Duplicator i3 printers. It features integrated A4988 stepper drivers, typically runs at 12V, and requires specialized flashing via ISP, often utilizing a Sanguino board definition in Arduino IDE.
Key Details for Melzi v4 Boards:

Common Use: Found in Wanhao I3 and similar printers.
Driver & MCU: Uses integrated A4988 stepper drivers and commonly an ATmega1284p chip.
Display Compatibility: Compatible with specific screens like the RepRap Discount Full Graphic Smart Controller or specialized "LCD for Melzi v4" modules.
Flashing Firmware: Often lacks a bootloader, requiring an ISP programmer or a spare Arduino to flash Marlin.
Upgrades: Common replacements include MKS Robin2 or Lerdge-X boards for modern touch-screen support.

Firmware Configuration:
When compiling firmware, the board is often designated as MOTHERBOARD 62 (Sanguino). The Klipper configuration file identifies key pins for X, Y, and Extruder.

Found a nice way flash the Melzi Board (Wanhao I3) and upgrade the firmware with a spare arduino
29 Dec 2016 — You can use a spare Arduino to flash the Melzi board. The Melzi board is usually flashed with a standalone AVR programmer. However...
Reddit
Can get my Lcd to work · Issue #2702 · MarlinFirmware/Marlin - GitHub
13 Oct 2015 — NarimaanV commented. ... The PCB of the screen in the picture on that site says "LCD for Melzi V4", which makes sense because it s...
GitHub
Swapping out old Melzi Ardentissimo for something better? - Reddit
18 Feb 2020 — Melzi Board ... I was hoping to swap it out with something more modern that runs off a touch screen interface, and make it more us...
Reddit

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