ADC Switchs

There are times when you need several switches, all pressed at different times, and you dont want to use several inputs to achieve this. I have made 2 varients, a switch panel (with eight switches) and a 2 way switch (joystick axis for example).

Using the following diagram, each of the buttons will set the adc pin to a voltage via the resistor divider. It will also allow for an error, if the pin goes to 5v or 0v that is a fault condition.

The lower the button number, or lower ADC value will take priority over the higher number switches.

The ADC Values are as follows

• 0-39 fault, 244-255 fault.
• 231 - 243 idle (no switch pushed)
• 40 - 64 button 1
• 65 - 89 button 2
• 90 - 114 button 3
• 115 - 140 button 4
• 141 - 166 button 5
• 167 - 190 button 6
• 191 - 205 button 7
• 206 - 230 button 8

of course it is best to measure with debug when playing with the buttons.

The ADC values are as follows

• 0 - 29, 244 - 255 fault
• 201 - 243 idle (no button pressed)
• 30 - 111 button 1
• 112 - 200 button 2.

Again measure with debug to ensure accuracy