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# Frequently Asked Questions |
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This document might contain answers to your questions regarding ofxPiMapper and life in general. |
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## 1. How to launch ofxPiMapper on boot? |
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It depends whether you are using the addon example or are integrating ofxPiMapper into your application. In both cases you will have to run `make` to compile the binary. |
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### 1.1. Compile |
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Make sure that you understand whether you are using the example or building your own. Use `cd` to navigate to your project directory on the Raspberry Pi. In case you are using the example, the command to use should be similar to the following. |
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```bash |
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cd /home/pi/openFrameworks/addons/ofxPiMapper/example |
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``` |
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Compile. Run the following command to do that. |
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```bash |
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make |
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``` |
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The compiled binary of the application should appear in the `bin` directory of the project. Run the following command to launch the application. |
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```bash |
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/home/pi/openFrameworks/addons/ofxPiMapper/example/bin/example |
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``` |
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### 1.2. Set up Cron |
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Cron is a job scheduler on UNIX-like systems. We are going to use the super user crontab to launch ofxPiMapper on boot. Use the following command to edit the crontab. |
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```bash |
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sudo crontab -e |
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``` |
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If using it for the first time, you will be prompted to choose the text editor you want to use. Select "nano". Proceed. Add the following line in the file. |
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``` |
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@reboot /home/pi/openFrameworks/addons/ofxPiMapper/example/bin/example |
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``` |
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Hit `ctrl` + `x` to exit. Hit `y` to confirm changes of the file and `enter` to confirm the existing name of the file. |
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Congratulations! OfxPiMapper should start up after next system reboot. |
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