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You can turn a single analog pin on a microcontroller to a 4-bit input with 1-bit output with only some resistors, push button switches, an LED and a single JFET… It has been done forever… ...
Figure 2 Switching device controlled by one button. In the initial state, a fixed voltage is applied to the input Cx of the chip (pin 2) from the resistive divider R1, R2. The voltage at the control ...
traditional, plunger style, spring pin connectors can be prone to in these types of applications. Omniball® connectors, offered in single and double row configurations, have a pin to pin spacing of 4 ...