I have in the process of transferring a fully breadboarded project to Eagle Lite so I can produce a PC board, and to document the project for this group.
I am almost finished, but am stuck on adding the 74HC595N shift register that I needed because I simply ran out of I/O pins on the Basic Stamp 2.
When I insert the 74HC595N chip in Eagle Lite, the component is shown without pins 8 and 16. I have pin 8 wired to Vss and 16 to Vdd on my test setup. I notice Vdd is also connected to pin 10 and Vss to 13.
Can I do without connecting pins 8 and 16? And therefore use to Eagle Lite 74HC595N component in my circuit diagram. Or should I try and track down another 74HC595N component for Eagle Lite that does show the 8 and 16 pins? The Stampworks manual shows pins 10 and 16 connected to Vdd and pins 8 and 13 to Vss.
This is my first attempt at a "real" project with the Basic Stamp, so be gentle with me. FYI it is an irrigation controller that uses a moisture probe to determine when and how much to irrigate. It also knows the local water restriction rules and shifts it's watering times accordingly, or switches off completely in order to comply. An LCD display shows the current date and time and water restriction stage, and three momentary contact switches allow the user to change the date, time and restriction stage. Also the system will only ever water the lawns and garden beds in the cool of the evening, further reducing the amount of water required. The aim of the project is to irrigate at little as possible. Water is becoming a scarse commodity in this country (Australia).