I chose the Nexus 4 as these devices are traditionally very open, as you can see in case of the Nexus 4 e. g. by the availability of Ubuntu Touch images. I didn`t expect however for it to be that hackable as I was about to find out on Saturday. I had just completed packaging the Mako kernel on Mer OBS in my home project and the package is now avail
Click here to download the full size of the above Circuit.
able (it however doesn`t boot properly yet). So the memories from me hacking on the Archos 5 IT with the openAOS project came back and I thought, wouldn`t it be nice to have an UART available for debugging A few queries to the Internet search engine of my least distrust later I had a first lead in the form of an XDA post. This however didn`t help me much yet, which logic levels which pins really the headphone socket I quickly checked and didn`t notice anything coming out of the port when piping out /dev/urandom to /dev/ttyHSL0. The circuit is basically a simple comparator with a reference Voltage of 2. 8V. If the input voltage on the other pin exceeds this, then it switches its output to VCC (logic 1/true). This apparently triggers a switch that turns off audio and puts a UART on R/RX, L/TX. I then proceeded to attach the bench power supply to the MIC and GND pins. (Set at 2. 9V and lowest possible current limit of about 10mA). Note that it`s connected so, that GND†’+ and MIC†’-, so -2, 9V. So, there you go, a nice and clean output. The RX port seems to suffer a bit from crosstalk though (but note the different V/div settings! for both channels!) Sadly I then connected some cables wrongly during my further experiments and it seems like I have now fried the switch. Audio out works fine, I just can`t seem to be able to enable the UART anymore. I`m a sad panda, but at least now others can benefit from this. Update: I...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: