An L7805 provides a 5v rail. The input and output of the reg is bridged by a 470 F and a 10 F capacitor respectively to try and smooth things out a bit. The 5v rail created by the L7805 then powers the MAX232 level shifter and the GPS module itself. Thee light-duty transistors have their bases coupled to the TTL-side of the MAX232 PPS, TXD and R
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XD lines, which in turn drive three LEDs to give some indication that the device is doing what it should. Once the thing was proven to work, it was time to build a version small enough to squeeze along side the GPS module within Minion`s chassis. The same basic design was employed, but this time without the LEDs: Rather than using the external serial port, I made up a 10-pin PCB header cable to attach directly to the EPIA MII`s internal serial port. Overall the effect is quite pleasing: Power is taken from the spare molex provided by the PicoPSU`s trailing cable and attaches to a header directly infront of the reg. All in all, it has proved to be a suspiciously neat install! In order to take advantage of accurate PPS timing, the Linux kernel needs to be patched for PPS support. At the time of writing, the latest Gentoo kernel in Gentoo`s unstable branch is gentoo-sources-2. 6. 28-r2, so I`m going to work against that. The patch applied cleanly with me, so no additional fiddling around was required. Using your favourite kernel config method, make sure PPS support is enabled: PPS support [ ] Use low level IRQ timestamps [ ] PPS debugging messages * PPS clients support * Kernel timer client (Testing client, use for debug) PPS line discipline [ ] Parallel printer support # cd /usr/include # mv linux linux. old # mv asm asm. old # mv asm-generic asm-generic. old # ln -s /lib/modules/$(uname -r)/build/include/linux...
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.....
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