arduino-555-watchdog-circuit.svg

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  <desc>Created by CircuitLab https://www.circuitlab.com/</desc><g transform="matrix(0.890224225227,0,0,0.890224225227,-1735.04701497,-1029.09920436)">
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      <tspan dy="-8.999999999999998">555 Timer</tspan>
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      <tspan dy="5.4">GND (1)</tspan>
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      <tspan dy="5.4">Trigger</tspan>
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      <tspan dy="5.4">Output</tspan>
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      <tspan dy="5.4">Reset</tspan>
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      <tspan dy="5.4">(8) VCC</tspan>
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      <tspan dy="5.4">Discharge</tspan>
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      <tspan dy="5.4">Threshold</tspan>
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      <tspan dy="5.4">VControl</tspan>
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      <tspan dy="7.2">Arduino</tspan>
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      <tspan dy="-2.3999999999999995">D1</tspan>
      <tspan dy="19.2" x="0">1N4148</tspan>
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      <tspan dy="7.2">GND</tspan>
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      <tspan dy="7.2">VCC</tspan>
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      <tspan dy="7.2">VCC / +5V</tspan>
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      <tspan dy="7.2">GND / 0V</tspan>
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      <tspan dy="-2.3999999999999995">C1</tspan>
      <tspan dy="19.2" x="0">100 µF</tspan>
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      <tspan dy="-2.3999999999999995">R3</tspan>
      <tspan dy="19.2" x="0">560 Ω</tspan>
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      <tspan dy="-2.3999999999999995">Digital I/O</tspan>
      <tspan dy="19.2" x="0">(Heartbeat)</tspan>
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      <tspan dy="-2.3999999999999995">R2</tspan>
      <tspan dy="19.2" x="0">220 Ω</tspan>
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      <tspan dy="-2.3999999999999995">R1</tspan>
      <tspan dy="19.2" x="0">1 MΩ</tspan>
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      <tspan dy="-2.3999999999999995">C2</tspan>
      <tspan dy="19.2" x="0">10 nF</tspan>
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