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benqprojector.py

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Python library to control BenQ projectors over the serial and network interface

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# Python library to control BenQ projectors

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## Introduction

A Python library to control BenQ projectors via the serial or network interface, including serial
to network bridges such as [esp-link](https://github.com/jeelabs/esp-link).

## Features

* Connects to a BenQ projector over serial or network interface
* Sending commands to projectors
* Reading the projector status
* Detect projector capabilities
* Uses asynchronous IO

## Protocol

BenQ projectors and flat panels with a serial port can support one of three protocols. This library
supports BenQ projectors in the L, P, T, W and X series, and likely others.

This Python library works if your projector supports the following command structure:

```
<CR>*<key>=<value>#<CR>
```

Where `<CR>` is a Carriage Return

Examples:  
Power on   : `<CR>*pow=on#<CR>`  
Power off  : `<CR>*pow=off#<CR>`  
Change source to HDMI: `<CR>*sour=hdmi#<CR>`

### PJLink

This library does **not** implement the PJLink protocol, but a proprietary BenQ protocol instead.
The PJLink protocol is covered by other libraries.

## Hardware

### Serial port

I'm using a generic serial to USB converter to connect to my projector. The projector has a male
DB9 connector, thus you need a female connector on your USB converter.

You can look up and change the baud rate in the menu of your BenQ projector.

### Network connected projectors

The commands as described above also work over a network connection. Although I don't own such a
projector I have implemented the network functionality using a serial to WiFi bridge. The network
support for integrated networked BenQ projectors is thus experimental. Let me know if your network
connected BenQ projector works.

Example of a serial to WiFi bridge using a serial to TTL converter and a Wemos C3 Mini:

It has to be said that a direct serial connection to the projector is much more responsive than
using a serial to WiFi bridge. Maybe this is different on an integrated networked BenQ projector or
using ethernet instead of WiFi.

## Supported projectors

The following projectors are known to work:

* HT4550i
* MS521P
* MW519
* TH585
* TK800m
* W1070
* W1100
* W1110
* W1140
* W1250
* W4000i
* W4100i
* X3000i

The following projectors are not tested but use the same protocol according to the documentation:

Others in the L, P, T, W and X Series

Not supported:

* RP552
* RP552H
* RP840G
* RP653
* RP703
* RP750
* RP750K
* RP652
* RP702
* RP790S
* RP705H

Some projectors need to be **powered on** to be able to detect the model and the library to work.

Please let me know if your projector is also supported by this Python library so I can improve the
overview of supported projectors.

## Installation

To install the Python BenQ projector library use the Package Installer for Python PIP:

`pip3 install benqprojector`

If you intend to only use the library for the CLI it is recommended to install the library in a
virtual environment:

```
python3 -m venv benqprojector
. benqprojector/bin/activate
pip3 install benqprojector
deactivate
```

## `benqprojector` CLI

You can use the Python BenQ projector library directly from the command line to turn on and off
your projector using the following syntax:

If you installed the library in a virtual environment then first enable the virtual environment
before executing any of the commands:

```
. benqprojector/bin/activate
```

Status of the projector: `python3 -m benqprojector serial <serial port> <baud> status`  
Turn on the projector: `python3 -m benqprojector serial <serial port> <baud> on`  
Turn off the projector: `python3 -m benqprojector serial <serial port> <baud> off`  
Monitor the projector status: `python3 -m benqprojector serial <serial port> <baud> monitor`

Where `<serial port>` is the serial port your projector is connected to and `<baud>` the baud rate
of the projector.

Or if your projector is connected using a serial to network bridge:

Status of the projector: `python3 -m benqprojector telnet <host> <port> status`  
Turn on the projector: `python3 -m benqprojector telnet <host> <port> on`  
Turn off the projector: `python3 -m benqprojector telnet <host> <port> off`
Monitor the projector status: `python3 -m benqprojector telnet <host> <port> monitor`

Where `<host>` is the hostname or IP address of the projector and `<port>` the optional port number
of the projector. If no port number is given the default port number 8000 is used.

### Detecting your projector capabilities

The benqprojector CLI can detect the commands, sources and modes your projector supports. If you
would like your projector to be fully supported by this Python library please run this command and
create an issue on GitHub with the output attached.

To examine your projector capabilities:

`python3 -m benqprojector serial <serial port> <baud> examine`

Your projector needs to be **powered on** and on an **active source** to be able to detect all your
projector capabilities.

### Troubleshooting

You can add the `--debug` flag to any CLI command to get more details on what's going on. Like so:

`python3 -m benqprojector serial <serial port> <baud> status --debug`

You can also add the `--record` flag to any CLI command to have the communication from the
projector recorded into a file. Like so:

`python3 -m benqprojector serial <serial port> <baud> status --record`

## Support my work

Do you enjoy using this Python library? Please consider supporting my work through one of the following
platforms. Your contribution is greatly appreciated and keeps me motivated:

[![GitHub Sponsors][github-shield]][github]
[![PayPal][paypal-shield]][paypal]
[![BuyMeCoffee][buymecoffee-shield]][buymecoffee]
[![Patreon][patreon-shield]][patreon]

## Hire me

If you're in need of a freelance Python developer for your project please contact me, you can find
my email address on [my GitHub profile](https://github.com/rrooggiieerr).

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