Hi,
I want to send data from my android smartphone to an arduino and also receive data back from the arduino. My problem is that I need pretty low latency (~50ms or less).
As bluetooth would probably be the most convenient solution I tried switching the onboard led of an arduino nano on and off with a HC-05 Module I had lying around. I used some bluetooth terminal app on my smartphone to send the commands. It worked, but there was a noticable delay, around 0.75s I would say. That said, I did use the module with its standard configuration. Might there be some options to reduce the delay?
I also have a HM-10 BLE module, but haven't got it working so far.
Furthermore I found this article: Bluetooth HID gamepad using HC-05 module - mitxela.com. What does the HID firmware do different so it can send button presses and joystick position at such low latency?
Are there any other options to achieve a low latency wireless connection between arduino and android?