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Voltage detector in need of hysteresis


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Good day. I’ve built the following circuit in hopes that it will detect when Vin exceeds 4 Volts for more than 2 seconds.

Built it last night but no such luck. Pin 3 (non inverting input) is held low at around 0.5 volts and the output therefore will not go high. Disconnecting R2 fixes the problem and circuit operates but there is slight oscillation due to no hysteresis. Any suggestions on how I can add hysteresis to this circuit? Thank you.

post-40276-14279143919704_thumb.jpg

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