EEcache

EECache

Datalogger RC-model airplanes

This 18x21mm sized data logger is capable of storing servo-signals or serial data with 2400 baud.
If one wnts to record multiple channels, one could use multiple devices.

It has an integrated user-interface, which can be accessed via Hyper-Terminal or any other terminal program with 19200 baud:

EECache V1.3

(c) Fabian Huslik 2004
www.huslik.net

Space = send data
s = Servo signal input (13 min)
f = Fast servo signal input (2,6 min)
r = Reset for 2400 baud serial input
d = Erase EEPROM
?:_

The device becomes "armed" via the terminal and beginswith the recording of the selected data format after the next power-on with a short delay.
The Recording is terminated, if the 8kB is full, or if the voltage is switched off.

With the space-key the memory content will be output via the terminal.
To use the content, the text recording of the terminal program has to be established before.

At "s" each 5th servo signal is recorded, until after about 13 min the memory is full.

At "f" each servo signal is recorded, until after about 2,6 min the memory is full.

At "r" serial data with 2400 baud is recieved over the servo signal line.
This requires - of course- a suitable source of data.

At "d" the complete memory is erased. (lasts about 20s)

Parts:

ATTiny12, 8bit microcontroller by Atmel
24LC64, serial EEprom by Microchip
Resistors 4x1k, 1x10k
capacitors 2x 100nF

Schematic, layout and code:

Download of the complete project as Eagle-file and AVR assembler source with hex-file.