I2C 8+8 expander with extra features

[aratti]

This project, based on pic16F876, was born as a simple 8+8 IOs expander because in industrial automation IOs are like bread.

Recently I have been requested to project a precision positioning machine with 3 axis and a spindle all driven with closed loop ac servo system (SanyoDenki)

I came to the conclusion that it was the right time to add extra features to the expander, in order to have a multi-purpose device, that I could also use for future applications.

I am posting, for sharing with the forum members and guests, a zipped file which contains the following:

8+8 IO expander.pdf (user manual & schematics)
I2C_Expander_2.hex (I2C address device # 2)
I2C_Expander_3.hex (I2C address device # 3)
I2C_Expander_4.hex (I2C address device # 4)

Hope you will find it useful

Al.