A simulation demonstrating a simple way to interface a reed switch to a generic digital input with an adjustable threshold voltage (assuming no hysteresis).
                                                                                    | ID | Name | Designator | Quantity | 
|---|---|---|---|
| 1 | 100p | C3 | 1 | 
| 2 | DI_BZT52C4V7 | D1 | 1 | 
| 3 | 100K | R4,R5 | 2 | 
| 4 | VOLTAGE_CONTROLLED_SWITCH_LT | S2 | 1 | 
| 5 | PULSE(0 1 1m 1u 1u 100m 200m) | V1 | 1 | 
| 6 | PULSE(12 14.7 150m 1m 1m 100) | V2 | 1 | 
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