If a page name is not selected by pressing the button, the previously selected page name continues to be used. The value is stored in EEPROM and may be changed at any time. When the unit is first powered on, and any time the Position page is displayed, the current magnetic variation is saved and used to convert all heading and bearing informationto magnetic degrees. The
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repeater checks the $GPRMC data sentence once every 10 minutes to update the magnetic variation. If the GPS sends a "satellite warning flag", the following message is displayed. This would occur if satellites aren`t being received (GPS indoors ) or if the satellites are broadcasting some sort of warning. If the baud rate received from the GPS is other than 4800, the following message is displayed. This would occur, for instance, if NMEA-0182 protocol (1200 baud) is selected or during Garmin protocol (9600 baud) uploads/downloads. A rather nice piece of Windows software provides the ability to create several virtual COM ports from one incoming GPS, and provides a simulated NMEA-0183 data stream for demo or testing, and has a number of other intesting features. There are other GPS and Serial tools as well. Refer to GpsGate at Franson Technology AB Pots R1, R2, R3 are adjusted to display correct battery voltages. To calibrate, apply 13. 98 volts and adjust the pot to display correctly. 14. 99 volts and higher simply displays as "14. 99". The diode on the 12V power supply input provides reverse current protection. More importantly, it isolates the repeater from 12V collapse (during engine starting, for instance. ) Any LCD display that has an industry-standard HD44780 compatible controller may be used. "Supertwist" displays have wider viewing angles than others. Two examples of LED backlight supertwist displays are: Basic...
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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