My Biohacking ideas.
Some of these ideas have been put forward by other people already, some are my own. Most of these ideas are probably at least a decade away or may be impossible but some could probably be installed within a month.
Heart rate monitor
Could be powered from the voltage given off by the heart. Could use a calculator LCD display or possibly even an e-ink tattoo. Also have an option to plug in to an external device via implanted 3.5mm headphone jack.
Something similar could be done for blood pressure and temperature giving a decent amount of medical information displayed directly on your skin.
May be hard to shrink down enough and power but would be freaking awesome. Best to set it so that it only activated when radiation got close to dangerous levels. Difficult to miniaturize, probably best on a larger part of the body such as the leg, shoulder, chest or back.
Took me a while to to think how to do this without the body becoming adjusting to the sensation making it unreadable or annoying. The best idea I can come up with is developing a tattoo ink which changes colour based on pressure. If this is imposible I'm sure there must be other ways of doing something as simple as a barometer.
Just as the brain can handle additional input thrown at it from the eye the same is probably true of the ear. We could either use gene therapy or connect a device to the auditory nerve to extend our hearing range. We could of course then use real echo location as well.
Could even go a step further with echo location by having an array of mics connected to a microcomputer which creates a 3D scene and sends the data to the optic nerve or visual cortex.
Infrared, ultraviolet vision
Other people have covered this in the forum but repeating just because it would be the most awesome thing ever! I know Some women are tetracromatic because having an extra x chromosome means they can have an extra variation of one of the eye cone genes. The brain has no trouble accepting this extra input. There is a whole world of beauty which we are missing out on. I would pay obscene amounts of money to achieve this.
Our brain's analogue nature is it's biggest strength and it's biggest weakness. We can do tasks which the biggest super computers wont be able to achieve for decades but at the same time most of us struggle to remember a phone number or doing two digit multiplication!
If we can find a way of converting between the brain and digital chips the rest should be easy. Even an extra MB of long-term memory, KB of short-term memory and MHZ of digital processing would open up possibilities I can hardly even begin to imagine.
Could also have it able to wirelessly connect to other people with the implant or wireless devices giving the user real telepathy.
Miniaturization wouldn't be a problem and the power demands of such tiny chips would be next to nothing so solving this problem would be a lot easier than interfacing it with the brain.
If I could only have one mod this would be it without a doubt.