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I have a bluetooth only keyboard (MS Surface ergonomic) which works great in Windows, but cannot access the BIOS or anything before the BT drivers are loaded. The companion mouse has a USB connection and when wired, the system recognizes it as a mouse so it functions independently of BT. I'd like to modify my keyboard to do the same.
Need help with a circuit design.I'm currently working on a power supply that will feed a Raspberry Pi and a Raspberry HAT. It can be powered by a 4.2V battery such as a 18650 lithium battery or a 5V USB supply. I have designed the circuit in such a way that when connected to the USB it turns off the battery supply. You can see the schematics in the following image:
The circuit can be summarised as the TPS61235 boost converter for the battery power mode and a P-channel mosfet to close the converter supply when USB is connected.It works fine except for one thing (the reason for the help request). When I have both sources connected, battery and USB, and remove the USB, the boost convert circuit is not fast enough to power the load, which results in a shutdown of the Raspberry Pi.So, any ideas on how to solve this issue? Is there a common way I'm not aware of in this kind of situation (I'm kind of new in the field of circuit design)?
I want to take an old bicycle and attach a magnet to the tire so whenever the magnet goes over the sensor it adds distance.
Example:
1 rotation of tire = 12 inches
Per 1 rotation; add 12 inches to overall distance
So basically a device that can count rotations and convert a rotation into a set inch amount.
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