GPDL Latency tester

What is GPDL Tester?
GPDL Tester is a tool for measuring latency of gamepad buttons and joysticks. It helps to determine how long it takes from pressing a button or moving a stick on the gamepad to registering this action on the PC. This allows gamers to check the performance of their gamepad and make sure it is working optimally for their games.

How GPDL works

1. The device presses the button (or deflects the stick) of the gamepad using the two pins connected to it.
2. The gamepad sends an action signal to the PC.
3. The program receives a signal about pressing the button (or rejecting the stick) from the gamepad.
4. The program calculates the time difference between the action (step 1) and the received signal (step 3).
5. The cycle performs 2000 tests to obtain accurate results.

Where to Get GPDL Tester

1. DIY Option: Follow the instructions in this guide to build your own GPDL Tester. Customize and learn as you build.
2. Pre-Made Version: Order a ready-to-use tester made by John Punch: https://ko-fi.com/s/850c1c4771

By choosing the pre-made option, you're contributing to the ongoing development and improvement of the GPDL Tester project.

Preparing for testing

1. Disassemble the gamepad to access the pins of its stіck or buttons.
2. Connect the two GPDL tester leads to the pins.
3. Turn on the gamepad and connect it to the computer via Bluetooth, cable, or receiver.
4. Connect the GPDL device to the computer.
5. Run the program "GPDL.exe".
6. Follow the instructions in the middle of the program.
7. Wait for the test to complete.

Receiving the results
After the test is completed, the results will be displayed on the gamepadla.com website in the form of a graph. All test data is saved in a separate text file in the program folder. You can also publish the results on gamepadla.com for public access.

Program interface

How to create a GPDL device yourself

Required components

1. Arduino Nano - https://amzn.to/3tSbvB3 | https://s.click.aliexpress.com/e/_DczmEt1
2. Cable - https://s.click.aliexpress.com/e/_DlX7bmn | https://amzn.to/3MaUU1F
3. Case STL - https://www.thingiverse.com/thing:6283094
4. Resistors kit - https://s.click.aliexpress.com/e/_DlKKEy3
5. Soldering iron - https://s.click.aliexpress.com/e/_Debb6R5

Optional components

1. Gecko tape - https://s.click.aliexpress.com/e/_DegtRf1
2. Conductive tape - https://amzn.to/43b0x7m
3. Crocodile type Clip - https://s.click.aliexpress.com/e/_DEfqkmT
4. Cable Sleeve 2mm - https://s.click.aliexpress.com/e/_DBg9qhZ
5. Heat Shrink Tube - https://s.click.aliexpress.com/e/_DkOt667

Actual scheme

The current GPDL tester scheme for version 2.2.5 and higher. The diagram shows an Arduino Micro, because I couldn't find a picture of a Nano. View the diagram in a more professional Chart format

What it will look like in real life

Required software

Download GPDL program for Windows 10/11
Arduino code this code should be flashed to the Arduino via Arduino IDE

Tutorial

Currently outdated (but still useful)
Video tutorial, the Arduino circuit in the video is a bit outdated, but the principle is the same
Text guide, the latest guide to measuring the input delay of buttons and sticks

⚠️WARNING:

1. The author cannot guarantee that the gamepad will not malfunction, so do all tests at your own risk!
2. The joystick testing mode is still experimental and may require additional resistors on the contacts depending on the stick voltage

LINKS:
Donate: https://ko-fi.com/gamepadla
A website with a catalog of tested gamepads: https://gamepadla.com