The NRF24L01 is a wonderful piece of technology, but very sensitive to electricity. (Note, this is for the Gravity Expansion HAT) Once everything is securely glued in, it’s time for wiring! Use the provided schematic to connect all the jumpers to their appropriate pins. Make sure to use lots of glue so that none of the pins ground to the tin can. (Refer to the pictures) This was primarily for aesthetic purposes, and wire management. I glued the speaker on one side of the battery pack, and the microphone on the other. The battery pack will always be the natural center of gravity for the can. This will be the heaviest part, I suggest apply glue to the edges and then placing it where you want the can to rest (so the antenna points upwards). Glue the Arduino Uno to the bottom of the can, and then attach the battery pack. If you hear a buzzing or beeping noise when testing it, you probably have a ground fault. Note: With all of these components, use copious amounts of hot glue, so nothing has the chance of grounding with the can. I also suggest coating the metal part of the antenna that sticks through the can with glue, so it won’t ground out to the can. Then, use hot glue to secure the antenna board against the can. Again, be careful of any sharp metal bits!įirst, plug in your hot glue gun and wait for it to heat up. Once that’s done, you can screw in the antenna and the button. I used a regular hammer because that’s all I had. Note: I suggest using a ball-peen hammer. I’ve provided a shoddy diagram that should be able to help you out. Please refer to the images for a better idea of how I did this. Mark the hole, tap it, and drill.Īfter this, I used a hammer and pliers to knock in the metal tabs and bend them down. Then I drilled five holes, and used tin snips to clean the material out and form it into a circle. Then I placed the nut onto the location I wanted the hole, and marked the inside diameter. Here’s how I did it.įirst, I unscrewed the plastic “nut” from the button. Note: I’m working with what I have, so I decided to attempt it using the drill and tin-snips again. Use tins nips and pliers to clean up this edge. Because of how flimsy the tin can is, it will usually shear, so watch for sharp metal. Once you’ve picked a size and marked out the hole, drill into the can, go at a high speed, but don’t push too hard. So what I did to find the right size, was compared the threads on the antenna to the drill bit sizes. This will help guide the drill in the next step.ĭepending on the antenna you use, you may need a smaller/larger hole. Then, using a tap, I put a small indentation where I was going to drill. Then, using my finger to note the ridge, I marked the hole with an Whiteboard marker, so that I could wipe them off later. First, I placed the antenna board inside the tin can, to measure how far from the side the hole would need to be. To do this, we will be drilling two holes, one for the antenna, and one for the button. Before we can wire up the electronics, we’ll need to prep the cans.
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