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Old Jun 03, 2011, 04:17 PM
OlliW is offline
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Joined Sep 2009
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Robbe Programmer V2 No. 8642 Hardware

Robbe Programmer V2 No. 8642 Hardware:
In the following pictures are shown the top and bottom sides of the print board and a hand drawing of the electronic scheme, the electric circuit diagram, and the original fuse settings:

Fuse setting:

The hardware consists of an Atmel Atmega88 micro controller run by a 8 MHz ceramic oscillator, a 2x16 tiny LCD display (no backlight), four keys, a beeper, and a servo connector. Again, besides offering all the hardware required for a "cool" programming box the most beautiful thing is that the ISP pins are easily available via soldering pads, which makes the Robbe Box an ideal platform for our (and many other :-)) purposes.

Atmega88 datasheet:

The ports of the Atmega88 are connected as follows:
PB3: E line of the LCD display
PB4: R/W line of the LCD display
PB5: RS line of the LCD display
PC0-PC4: DB4 to DB7 lines of the LCD display
PB5 / OC1B: beeper (high = off!)
PD6: down arrow key (most left key)
PD5: inc + key (middle left key)
PD4: dec - key (middle right key)
PD7: up arrow key (most right key)
PD0 / RXD & PD1 / TXD: connected via a resistor network to the servo connector, allows for a half-duplex serial 1-wire communication

In order to use this box, no hardware changes are required!

EDIT(2. July 2011): The Robbe Box may also come with an Atmega88PA (signature 0x1e930f) instead of the Atmega88. Otherwise, however, the circuit and fuse settings are exactly identical as shown in the above.
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Last edited by OlliW; Jul 02, 2011 at 11:01 AM.