/challenges-projects/design-challenges/on-the-line/b/projects/posts/aiot-smart-active-dry-box-print-farm-supervisor1. Background and System Concept 1.1 Problem Statement In 3D printing operations at print-farm scale, maintaining filament material quality is crucial for production continuity. High ambient humidity triggers filament degradation, making it brittleen-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/on-the-line/b/projects/posts/aiot-smart-active-dry-box-print-farm-supervisorMon, 22 Jun 2026 02:50:21 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:4915ead6-7049-4efd-a562-42edd273ca16arvindsa0<p>Hi, the 250ohm resistor value is only a indicative value. For 3.3V systems you cannuse 150ohm 1% resistor.&nbsp; Take a look at my post&nbsp;&nbsp;[mention:4db1258e89ee4430b12d99fa48525283:46448885d0e64133bbfbf0cd7b0fd6f7]&nbsp;</p> <p></p><img src="https://community.element14.com/aggbug?PostID=29883&AppID=483&AppType=Weblog&ContentType=0" width="1" height="1">