Need some help identifying and configuring an old controller board. Hi, I've come across an old board, I think it's a Tronxy P802MA based on melzi: However I've flashed marlin and klipper to the board, but I simply cannot get the endstops on x/y working, without knowing exactly what board I'm working with, it's a bit of a struggle to make sure I have the right pins, or I'm dealing with a hardware failure. I'm on klipper at the moment and the configs I am use are: [stepper_x] step_pin: PD7 dir_pin: PC5 enable_pin: !PD6 microsteps: 16 rotation_distance: 32 endstop_pin: PC2 position_endstop: -8 position_max: 220 position_min: -45 homing_speed: 50 [stepper_y] step_pin: PC6 dir_pin: PC7 enable_pin: !PD6 microsteps: 16 rotation_distance: 32 endstop_pin: ^PC3 position_endstop: 0 position_min: -5 position_max: 220 homing_speed: 50 I've tried various combos of reversing logic or using pull up to no avail I'm getting 4.9v at the pull up resistor in front of the endstop socket, but S+G is only seeing 2.8v - V+G is seeing 12v The Z endstop is working fine, S+G showing 5.5v dropping when closed PS: you may need to zoom in on image to see where I took voltage readings thanks https://reprap.org/forum/read.php?13,897448,897448#msg-897448 Wed, 22 Apr 2026 13:56:46 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,897448,897448#msg-897448 Need some help identifying and configuring an old controller board. https://reprap.org/forum/read.php?13,897448,897448#msg-897448
I've come across an old board, I think it's a Tronxy P802MA based on melzi:

However I've flashed marlin and klipper to the board, but I simply cannot get the endstops on x/y working, without knowing exactly what board I'm working with, it's a bit of a struggle to make sure I have the right pins, or I'm dealing with a hardware failure.

I'm on klipper at the moment and the configs I am use are:

[stepper_x]
step_pin: PD7
dir_pin: PC5
enable_pin: !PD6
microsteps: 16
rotation_distance: 32
endstop_pin: PC2
position_endstop: -8
position_max: 220
position_min: -45
homing_speed: 50

[stepper_y]
step_pin: PC6
dir_pin: PC7
enable_pin: !PD6
microsteps: 16
rotation_distance: 32
endstop_pin: ^PC3
position_endstop: 0
position_min: -5
position_max: 220
homing_speed: 50

I've tried various combos of reversing logic or using pull up to no avail

I'm getting 4.9v at the pull up resistor in front of the endstop socket, but S+G is only seeing 2.8v - V+G is seeing 12v

The Z endstop is working fine, S+G showing 5.5v dropping when closed

PS: you may need to zoom in on image to see where I took voltage readings

thanks]]> Mart7 Controllers Fri, 30 Jan 2026 18:11:20 -0500