Temperature Data Recorder microcontroller based

The keypad has 6 buttons connected by a matrix - "Arrow", "OK" (left-bottom), and "The Return" (right-bottom). When held up OK at boot time recorder (reset) mode turns on the configuration where you can set the current time (in the future there will be more options.) The display is a 16-character on the controller module with HD44780 bought for as little as 5.5 zł Lispole store . Is displayed on the current time and temperature alternately with the date. Unlike the first version, on the board there are three indicator lights (Power, Status - flashes every 5 seconds, the record \ reading from SD (SPI) \ RTC (I2C) \ Thermometer (1Wire)) and a beeper that sounds when you press it buttons at the configuration and control signals at the start. Additionally, the board's pin RS232 (TTL), useful for debugging.

In this data logger project the memory issues has been significantly reduced, memory card slot went to the back. The power transistors control peripherals (clock / thermometer / card / lcd) and backlit display and a second crystal oscillator for the clock wybudzającego 32k from sleep mode. As before, all the elements are in a housing for mounting hole (except the slot for SD / MMC card. The system can be easily expanded by adding additional slot eg humidity sensor, pressure, anemometer, etc.


C program is also a lot has changed. In contrast to the carelessly written and unfinished firmware version 0.2x (includy. Cw main, etc..), Is nicely divided into modules, optimized and stable. No longer hangs when removing and inserting cards, etc. In addition, Dharmaniego resigned from the library, where I found a lot of errors for the better - Fatfs . Now, in addition to the recorder supports FAT32, FAT12 and FAT16 systems. Also was good support for energy conservation. In economy mode the display is off, peripherals turned on only when needed, and after writing the microcontroller goes to sleep until the next measurement, which significantly reduced power consumption. According to my cheap, Chinese multimeter recorder takes about 13-14uA in sleep.


SOURCE =:- http://silent.it.cx/home/2010/05/13/rejestrator-temperatury-v2/