Thanks Drew for sending this in! Via Oshpark
Bill of Materials:
- 3mm LED (through-hole)
- 10mm length reed switch (through-hole)
- 470Ω ¼ watt carbon film resistor (the common ‘hobby sized’ through-hole)
- 12mm or 10mm battery retainer
- Coin cell battery to match retainer (10mm works well with a CR927 for example)
- Strong-ish magnet
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