https://github.com/werediver/ir-uart

IR UART 9600 baud adapter
https://github.com/werediver/ir-uart

hardware infrared remote-control uart

Last synced: 5 months ago
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IR UART 9600 baud adapter

• Host: GitHub
• URL: https://github.com/werediver/ir-uart
• Owner: werediver
• License: cern-ohl-p-2.0
• Created: 2024-02-24T15:21:55.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2024-03-24T19:16:18.000Z (about 2 years ago)
• Last Synced: 2024-10-19T07:53:06.360Z (over 1 year ago)
• Topics: hardware, infrared, remote-control, uart
• Homepage: https://hackaday.io/project/195022-ir-uart
• Size: 6.16 MB
• Stars: 4
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# IR UART

This is an IR UART adapter. Its transmitter and receiver are independent, there is no automatic echo suppression. The receiver is based on [TSDP34156](http://www.vishay.com/docs/82667/tsdp341.pdf) IR receiver. The transmitter is built using [TSAL6400](https://www.vishay.com/docs/81011/tsal6400.pdf) 940 nm IR LEDs and a carrier generator based on [74HC132](https://assets.nexperia.com/documents/data-sheet/74HC_HCT132.pdf) quad-NAND CMOS gate.

The nominal transmission rate is 9600 baud. The carrier generator should be tuned to 57.6 kHz (with 6 cycles per bit it gives $57600 / 6 = 9600$ baud).

The adapter can be powered from 3.3 V or 5 V and will operate with the corresponding logic levels.

The board size is just 21x36 mm and provides 8 unconnected PTH (plated through holes) for mounting purposes. It should fit the [Pico (RP2040)](https://datasheets.raspberrypi.com/pico/pico-datasheet.pdf) board well.

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| ![Assembly top view](images/assembly-top.png) | ![Assembly overview](images/assembly-overview.png) |

| ![PCB top view](images/pcb-top.png) | ![PCB bottom view](images/pcb-bottom.png) |

![Schematic](images/schematic.svg)

## Performance

With minor adjustments after the first tests, the modules work as expected transmitting and receiving 1 kHz test signal. Using the modules with UART hasn't been tested yet.

Some more photos and/or info may be found at [hackaday.io/project/195022-ir-uart](https://hackaday.io/project/195022-ir-uart).