Hi there guys and girls
I have now reached the limits of analog IN pins of my Arduino Mega and the project needs redesigning.
I have 20 temperature sensors now that need to be read (thermocouples), and was thinking of designing the project around I2C now.
Has anyone of you used MAX504CPD-ND (digikey number) 10 bit analog to serial converter with I2C?
I do not want to buy 20 pcs of those as it will add $60+ to my budget
Any clever ideas to read my 20+ analog inputs to I2C?
I think I have come up with a solution that is not too expensive for me.
I might use two of those I2C 20-I/O expanders:
One I2C is set up to turn on transistor to supply each of my Instrument amplyfying circuit 5V, thus I turn on and off each temp sensor. then I just connect the output of the Instrument amplifiers together in 1-3 groups to 1-3 analog to serial converters (MAX504) connected to the other I2C expander. Then it is just to read the no.2. I2C values.
Does this sound too crazy? :o
How about just adding an analogue multiplexer (or two) in front of the arduino's analogue pins?
thanks, will do...
Would like to do custom I2C although :)