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 <h2 id="projects-hard">Projects - Hardware</h2>
 <ul>
 	<li><a href="https://git.ztn.sh/AfRA/AfRApay" target="_blank">AfRApay</a> - Digital balance tracking system for the AfRA hackerspace</li>
-	<li><a href="https://git.ztn.sh/zotan/esp32-co2-mhz19b" target="_blank">esp32-co2-mhz19b</a> - ESP32-based CO2 monitoring setup</li>
+	<li><a href="https://git.ztn.sh/zotan/esp32-co2-scd4x" target="_blank">esp32-co2-scd4x</a> - ESP32-based CO2 monitoring setup (new sensor)</li>
+	<li><a href="https://git.ztn.sh/zotan/esp32-co2-mhz19b" target="_blank">esp32-co2-mhz19b</a> - ESP32-based CO2 monitoring setup (old sensor)</li>
 </ul>
 <h2 id="papers">Papers</h2>
 <ul>