The Arduino 2009 acts as a standalone weather station. It does not display the data. It can operate independently for months. It samples the sensors until the RAM is full. The RAM samples are stored on a sector of an SD card. Eventually, a year`s weather samples could be stored on the SD card. Each time the PC is connected, any unstored sectors ar
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e uploaded to files on the PC`s hard drive. It can then be displayed using all the facilities of the PC`s display. The SD card current sector is held in EEPROM so that during power off or reset, it can be reused. The Arduino has a class EEPROM which only allows read and write of bytes. To read a long (32 bytes in Arduino) requires some work: inline void ready() { unsigned long lastblock = 0; //the last block number saved in the sd card unsigned long tempblock = 0; tempblock = EEPROM. read(0); // remember the LSB of the last saved block lastblock |= tempblock; tempblock = EEPROM. read(1); // remember the next LSB of the last saved block lastblock |= tempblock << 8; tempblock = EEPROM. read(2); // remember the next LSB of the last saved block lastblock |= tempblock << 16; tempblock = EEPROM. read(3); // remember the next MSB of the last saved block lastblock |= tempblock << 24; Serial. println("ready"); //send computer the ready to reset message Serial. println(lastblock); //send computer the last saved block number delay(10000); //every 10 seconds }//end of ready /* Card type: Ver2. 00 or later Standard Capacity SD Memory Card 1. 0 and 2. 0 GB cards purchased in 2009 work well. Usage: Must have global variable. volatile unsigned char buffer[512]; Function calls. unsigned char error = SDCARD. readblock(unsigned long n); unsigned char error = SDCARD. writeblock(unsigned long n); error is 0 for correct operation read copies the...
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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