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making a simple IR transmitter
msuffidy:
I want to make a simple IR transmitter to control something controlled by a small Chinese typical remote. I have something to sample the signal.
I have come up with some strategies so far and I wonder what the issues could be
1) Energizing a IR led with a headphone jack. There are IR blasters. They are usually wired 2 leds in opposite direction. I think in some cases frequency filters and transformers are maybe a barrier to arbitrary square waveforms. So maybe they are going back and forth at a high frequency to mimic a solid 1 for example with 0 drop outs.
2) Gating an externally powered flip flop by like a shmitt trigger of the above signal.
3) Using a USB serial bridge to energize the LED if like you can freely and quickly alter the RTS or CTS.
4) Using a USB serial source signal to bias a flip flop discarding the start bit.
5) Get a raspberry pi and tie the led across a GPIO
6) Find some cheap usb device who's led can be set by software and resolder a IR led to.
msuffidy:
I have something I think is a emitter on a 3.5 mm headphone jack I found. It is a clear led in a small reddish case. When I use the diode test on a DMM, it lights up visible red. Does this mean it is a receiver, or does it mean the power is too great?
msuffidy:
Looking around here I recalled I have a remote scrapped, and also I have a devkit I got for free off the internet, so I am thinking hopefully I can solder, or use a jumper header, a IR led over the end and maybe have to add a resistor if it is like 5V. I should be able to program it to, by usb, turn the led off and on. This is what it is regarding, and at this time I am looking to make a high speed color dithering thing between color steps:
MosherIV:
That looks like a debugger for a low end micro.
They normally talk with SWD to a micro.
They have a micro in them programmed to be some kind of usb device type, usually HID and then use that device to transfer the SWD data stream to the target micro.
Yes, you can re-program it to do what you want but it is a LOT of effort.
Check out this thread
https://www.eevblog.com/forum/testgear/fluke-187-making-an-ir-cable/
You might be better off buying CH340 or CP2102 which are usb to serial converters and just interface to the tx pin. Both the Fluke adapter and Keysight/Aglient adapter are just USB serial chips
msuffidy:
Thanks for you comment. I'll consider it. Got a week to burn or so, so I don't know. I just downloaded SDCC and it supports the 8051, but there is a learning curve, and I hope it works in the end. It has to make the timings also. Not sure
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