Adafruit Industries, Essential service and business: NYC – Executive Order 202.6 - Read more. Accepting essential orders - here's how.
0

MakeCode Arcade – a low latency platform? #MakeCode #Gaming @MSMakeCode

kjw on the Microsoft MakeCode blog posts about measuring the latency on MakeCode Arcade hardware.

I stumbled across Dan Luu’s Computer Latency 1 page where he’s investigated and measured the response times from keyboard to screen of a wide range of devices. I’m sure he’s surprised some with the 1980s computer from some obscure manufacturer ruling the roost.

I thought I’d have a look at the Arcade hardware. Here’s the Adafruit PyGamer running some simple code which puts a sprite on screen when A is pressed (compiled on 0.15.5):

button-to-screen-latency-example-1

Frame 13 is where the highlighter pen hits the button, frame 25 is where A is first visible on screen, frame 34 is roughly where A reaches maximum brightness. That’s from a very cheap 240fps camera which in the mp4 says it’s actually 233.79fps (latter value confirmed by the Android tablet’s timer).

I had a look at a few presses and it looks strangely consistent at 12 frames for the A to first appear on screen which makes the delay 51ms (12 * (1/233.79) * 1000). Is that a likely number given the hardware (including any debouncing) and game loop? I was expecting it to vary a bit more varied based on when the button was pressed within the 20ms duration game loop?

It’s interesting to see the response time of the humble Adafruit 1.8″ TFT LCD screen too. From watching the reset screen it looks like they update from the left so it’s possible that sprite position is important for this latency measurement and that middle of screen gives a useful mean value.

The tiny program is available on https://makecode.com/_8VY3WT1Dychj

As a response, mmoskal posts:

I believe we scan buttons every 4ms, it may take 8 or even 12 to register. Game loop update is around 25ms. So it all sounds about right. Not sure why the timing would be so consistent.

See the post here.


Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 16,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — 1,000 True Fans, how creators can sustain themselves in the digital age

Wearables — Hobby knife on hand

Electronics — Diode Vf vs Voltage

Biohacking — Vitamin-C + Gelatin for Accelerated Recovery

Python for Microcontrollers — CircuitPython 5.1.0 Release Candidate 0 and more! #Python #Adafruit #CircuitPython @circuitpython @micropython @ThePSF @Adafruit

Adafruit IoT Monthly — Together we’ll make it, Upcycled IoT Display, ESP32-S2 in the Wild and More!

Microsoft MakeCode — MakeCode Powered Flowerpot!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.