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# Hardrock-50 Remote Display
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.
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:
* Heltec ESP32 board with display
* a python flask application, which represents the communication via the serial interface in the form of an API
This diagram shows which components are required and how the communicate:
![Diagram](diagram.jpg "Diagram")
This is how the display looks like in action:
![Photo of the Heltec board](hr50-remote-display.jpg "Photo of the Heltec board")
You can find a short video here: []
# Client
## Preconditions
### Hardware
* Heltec ESP32 Wifi Dev Kit Board with OLED
### Software
* Arduino IDE
### Libraries
* Heltec Libraries: []
* ArduinoJson
* HTTPClient
* WiFi
* EasyButton
## Configuration
Rename the file _config.h_dist_ to _config.h_ and edit the following lines:
const char* ssid = "<ENTER_HERE_YOUR_WIFI_SSID>";
const char* password = "<PASSWORD>";
String api_base_url = "http://<ENTER_HERE_THE_IP_OF_YOUR API_SERVER>:5000";
Example: If your wifi is named "hamradio", your wifi password is "hamradio4life" and the IP address of your server is "", your config should look like this:
const char* ssid = "hamradio";
const char* password = "hamradio4life";
String api_base_url = "";
## Installation
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.
## Usage
Execute the server (see below) and power up the ESP board. The following user interaction is possible:
* short press of the upper button: executes a shell script / system command / program (Server config parameter 'shell_cmd')
* 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')
* the lower button reboots the device
## Error handling
* If wifi is unavailable or misconfigured, the device will show "No Wifi!" on the screen
* HTTP Errors will also displayed on the OLED
* 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.
# Server
# Preconditions
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.
# Configuration
Open the file _hr50_rd_server.py_ and adapt the following lines to your environment regarding the USB connection to the HR50:
serial_port = '/dev/ttyUSB0'
baud = 19200
Edit the following lines if you want to customize the actions performed when pressing the upper button:
shell_cmd = "./scripts/"
serial_cmd = "hrtu1"
serial_cmd_msg = "Tune"
_serial_cmd_msg_ is a message that will be displayed on the screen after executing the _serial_cmd_.
# Execution
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.
Run it as follows:
# cd server
# ./
# API Endpoints
There are two API endpoints available:
#### /exec_serial
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 ";"
#### /exec_shell
This method allows you to execute shell commands on the server
#### /get_status
This method returns all avalable information in JSON