130 lines
4.1 KiB
Markdown
130 lines
4.1 KiB
Markdown
# Hardrock-50 Remote Display
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The Hardrock-50 is a 50W power amplifier for amateur radio QRP transceivers. It has a display showing valuable information like the selected band, the SWR, power, temperature etc. Since I am using the HR50 in a remote station, I cannot directly access those information via the display.
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However, the HR50 offers serial communication via a USB port. This project tries to solve this problem with the help of a separate, wifi enabled hardware display. It consists of the following two components:
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* Heltec ESP32 board with display
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* a python flask application, which represents the communication via the serial interface in the form of an API
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This diagram shows which components are required and how the communicate:
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This is how the display looks like in action:
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You can find a short video here: [https://www.youtube.com/watch?v=50ZxkoQPq7Y]
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# Client
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## Preconditions
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### Hardware
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* Heltec ESP32 Wifi Dev Kit Board with OLED
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### Software
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* Arduino IDE
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### Libraries
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* Heltec Libraries: [https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series]
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* ArduinoJson
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* HTTPClient
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* WiFi
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* EasyButton
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## Configuration
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Rename the file _config.h_dist_ to _config.h_ and edit the following lines:
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```
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const char* ssid = "<ENTER_HERE_YOUR_WIFI_SSID>";
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const char* password = "<PASSWORD>";
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String api_base_url = "http://<ENTER_HERE_THE_IP_OF_YOUR API_SERVER>:5000";
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```
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Example: If your wifi is named "hamradio", your wifi password is "hamradio4life" and the IP address of your server is "192.168.1.100", your config should look like this:
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```
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const char* ssid = "hamradio";
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const char* password = "hamradio4life";
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String api_base_url = "http://192.168.1.100:5000";
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```
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## Installation
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Add the files to your Arduino IDE, install all necessary libraries, configure the board and USB/serial port, compile the sketch and then upload it.
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## Usage
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Execute the server (see below) and power up the ESP board. The following user interaction is possible:
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* short press of the upper button: executes a shell script / system command / program (Server config parameter 'shell_cmd')
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* long press of the upper button: sends a serial commannd to the HR50. The default command will initiate the tuning cycle during the next transmission (Server config parameter 'serial_cmd')
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* the lower button reboots the device
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## Error handling
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* If wifi is unavailable or misconfigured, the device will show "No Wifi!" on the screen
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* HTTP Errors will also displayed on the OLED
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* When you key up your TRX and therefore the HR50, no serial communication is possible. The latest gathered information will still be displayed on the screen but there will be a "(!)" in the third row as an indicator for this situation.
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# Server
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# Preconditions
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You need a computer connected to the Hardrock-50 via USB, e.g. a Raspberry Pi. This system needs to be able to run Python and has to be connected to your network.
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# Configuration
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Open the file _hr50_rd_server.py_ and adapt the following lines to your environment regarding the USB connection to the HR50:
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```
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serial_port = '/dev/ttyUSB0'
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baud = 19200
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```
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Edit the following lines if you want to customize the actions performed when pressing the upper button:
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```
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shell_cmd = "./scripts/toggle_antenna.sh"
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serial_cmd = "hrtu1"
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serial_cmd_msg = "Tune"
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```
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_serial_cmd_msg_ is a message that will be displayed on the screen after executing the _serial_cmd_.
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# Execution
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Executing this script will spawn a web server running on port 5000. This is not meant for production use and/or public exposure. Anyone able to access this server via the network can alter any settings on your HR50.
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Run it as follows:
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```
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# cd server
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# ./bootstrap.sh
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```
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# API Endpoints
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There are two API endpoints available:
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#### /exec_serial
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This method allows you to send commands to the HR50. The commands can be taken from the HR50 operator's manual and do not require the trailing ";"
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#### /exec_shell
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This method allows you to execute shell commands on the server
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#### /get_status
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This method returns all avalable information in JSON
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