/challenges-projects/design-challenges/hats-off/b/blog/posts/spy-hat-progress-1This hat was actually pretty simple to make. It only had 4 electronic parts: The Gemma, the HC-SR04 sensor, one NeoPixel, and the battery. Once I connected all the parts and downloaded the software, it just worked! I originally plann...en-USTelligent Community 12https://community.element14.com/challenges-projects/design-challenges/hats-off/b/blog/posts/spy-hat-progress-1Thu, 30 Oct 2014 19:15:50 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:bd2e8d7d-7f4c-4419-abcf-b6dc66ef3dfaDAB1<p>Very nice build.</p><p>&nbsp;</p><p>Simple, but effective.</p><p>I could see bike riders using your hat to see if anyone is tailgating them on the road.</p><p>&nbsp;</p><p>Well done.</p><p>DAB</p><img src="https://community.element14.com/aggbug?PostID=19072&AppID=109&AppType=Weblog&ContentType=0" width="1" height="1">