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65 lines
1.8 KiB
65 lines
1.8 KiB
tinyLCD_I2C
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===========
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Description:
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------------
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tinyLCD_I2C is a Firmware for LCD I2C backpack based on ATtiny84 with an Arduino library as drop-in replacment for the LiquidCrystal library.
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Instructions
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------------
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Please make sure to use the TinyWireS library from this repo with the ATtiny implementation from
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http://code.google.com/p/arduino-tiny/
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Also you should make the following change in ./hardware/tiny/cores/tiny/wiring.c to improve performance of the TinyWireS library:
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```ISR(MILLISTIMER_OVF_vect)
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{
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sei();
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// copy these to local variables so they can be stored in registers
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// (volatile variables must be read from memory on every access)
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```
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Basically add the line
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```
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sei();
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```
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to the *ISR(MILLISTIMER_OVF_vect)* function so that it looks like above excerpt.
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See http://forum.boxtec.ch/index.php/topic,2225.msg2845.html#msg2845 for a discussion on this issue.
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Boards / PCBs
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-------------
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The boards directory contains a Fritzing THT design on which current development is based and an Eagle 6.x SMD design which is currently in production for first prototypes.
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BOM
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---
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THT-Board:
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- 220nF Cer Cap
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- 100k, 4.7k, 150R
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- ATtiny84A-PU
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- 28 Pin DIP socket (optional)
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- Header female (16pins)
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- 2x3 Pin Header male
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SMD-Board:
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- 220nF Cer Cap
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- 100k, 4.7k, 150R
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- ATtiny84-SU (SOIC)
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- Header female (16pins)
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- 2x3 Pin Header male
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Forum / contact
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---------------
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Issues around the tinyLCD_I2C board and firmware can be discuess here:
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- http://forum.boxtec.ch/index.php/topic,2225.0.html
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Credits
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-------
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Credits go to ..
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.. *brohogan* for bringing the [TinyWireS library](http://playground.arduino.cc/Code/USIi2c) to life in the first place.
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.. pylon for fixing all the timing issue and race conditions in above library and enhancing the tinyLCD_I2C greatly (i.e. by adding SPI)
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.. MathiasW for adding a SMD design with reduced size
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