I found this diagram at https://www.pinterest.com/pin/559501953700910845/ and t worked great for me!
Get 7% off digital distribution on Distrokid https://distrokid.com/vip/demonicsweaters. Piezos https://amzn.to/3hOc7wN, gaffer’s tape https://amzn.to/32FxKct, output jacks https://amzn.to/32MmpHq, L brackets https://amzn.to/3bbx56r. You can probably find wire, sponges, and anything else you need laying around the house. Though the total cost of buying all of these items is more than $5, it will allow you to make 6 of them since most of the items come in bulk, and it is still very cheap, so in reality one trigger is probably less than $5 if you’re good at math and want to figure out because I am not. Either way it’s cheap and works. Did you ever want to know how to build your own drum trigger? How about a dual zone trigger that mounts on the inside of the drum? It is really not that hard. Though there’s some videos on YouTube of people making ones WAY MORE COMPLICATED than this one. This one will work, and does a good job once you get it configured.