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  1. M

    8051 program not processing keypad matrix correctly

    I made myself a small PCB (measuring about 6cm by 5cm). This is what is supposed to happen: 1. Upon power-up, the LED goes red to indicate that the unit is ready for input. 2. I then press any key down (where the contacts in the button meet), then the red led goes off. 3. The correct value is...
  2. S

    Password keypad in Citect Scada/FX3U PLC

    I am building an storage's safe for my final school project and I want to put an keypad on there so there can be put in an different password for every box that gets put in the safe. when you want to put an box in, there needs to appear an screen where you can put in an password this password...

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