Hacking the 1Mii Bluetooth 5.3 Transmitter Receiver: Auto Shutoff No More

Here's a thing that happens. The 1 Mii Bluetooth 5.3 Transmitter/Reciver shuts off its power automatically when it either doesn't hear audio for five minutes, or when it's not paired to a pair of headphones for five minutes. These are pretty common things when you're out on a POTA camping trip as the gang and I frequently are.

(Yes, I do see them. No, I haven't had time to figure out what they are this time :) )

One of my favorite things to do is wake at about 3 in the morning to see what weird things the F2 layer is doing. I can actually hear far away signals when there's not a whole city's worth, (I love you San Francicsco, but geesh), of noise. That's how we wound up talking to three stations in Europe on our last POTA above Mountainair while it was snowing outside!

But! If the power goes off on the Bluetooth transmitter now that Project TouCans is completely wireless, then I have to bring the whole rig down to reset it. There's an answer though, and like many other answers for Project TouCans since it's gone wireless, it involves a relay.

If we can setup a releay—controlled by the Pico-W—that can cycle power on the Bluetooth transmitter, receiver aka an ML300, then we're off and running. That's what 11 year-old Mota, 9 year-old Tawnse, and I worked on today. Our first step was to try to expose the RX/OFF/TX switch terminals. That meant device surgery!

We got as far as learning where two of the three switch terminals can be found. We'll get the third terminal soon, and give it a try. Here's what we saw so far:

If you look closely, you can see there's a post labeled RX. There's a similar one hidden by the screwdriver that says TX. Tawsnse and Mota learned how to slowly, somewhat methodically take something a part to modify it. It was a cool morning!

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