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probonopd / irdb

One of the largest crowd-sourced, manufacturer-independent databases of infrared remote control codes on the web, and aspiring to become the most comprehensive and most accurate one
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IR code storage suggestions #10

Closed wormyrocks closed 5 years ago

wormyrocks commented 6 years ago

Hi!

I am starting a project to build the cheapest and most minimal possible Arduino-compatible universal remote. I hope to be able to store up to 24 IR codes internally, with a web app that ties into IRDB to download codes to the device. I'm hoping to use an ATTiny841 with Micronucleus / V-USB for communication.

I'm trying to figure out how little internal memory I can get away with; I'm debating between having the web app compile a hex file with code values stored in PROGMEM and then upload to the device, or to send the code values over serial to an EEPROM.

So I haven't seen this answered in a simple way anywhere else: what is the longest typical IR code that we might see anywhere? For instance, if I put a 2 kB EEPROM on my board, will that be enough to guarantee space for 24 codes?

Thanks! I will keep your team posted as I develop this project. Everything should be open source.

probonopd commented 6 years ago

You can either store the "rendered" form of the codes (on-off-timings) or just the information on how to render the codes plus a renderer. The latter is how commercial universal remotes work, because it is much more efficient for a large number of codes (needs less memory for the codes than storing the rendered timings but needs some memory for the renderer). https://github.com/bengtmartensson/AGirs may be one option. Not sure if it can be made run on an ATTiny841 though.