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Here's a pic of the PIR/prop timer I'm entering in the challenge. The PIR is hacked to allow two off-interval times, 30 and 60 seconds between triggers. The timer can be set from 2 seconds to 1:30. The total cost is under $18, including the batteries. Here's the parts list:
All Electronics:
Part / part number
Switch - MTS-4
Cost 4/4.00
Qty. needed 2
Ext. cost 2.00
Relay - RLY-645
Cost 1.50
Qty. needed 1
Ext. cost 1.50
Perf board - PC-3
Cost 1.50
Qty. needed 1
Ext. cost 1.50
Transistor-MPSA13
Cost 5/.50
Qty. needed 1
Ext. cost 0.10
Capacitor-100mfd/35V radial
Cost .27
Qty. needed 1
Ext. cost 0.27
Diode - 1N4148
Cost 15/.99
Qty. needed 1
Ext. cost 0.07
Potentiometer - AP-1M
Cost 0.50
Qty. needed 1
Ext. cost 0.50
Resistor - 470K ohm 1/4 watt
Cost 10/.50
Qty. needed 1
Ext. cost 0.05
Resistor - 1K ohm 1/4 watt
Cost 10/.50
Qty. needed 1
Ext. cost 0.05
Project box - TB-3
Cost 2.50
Qty. needed 2.50
Ext. cost 2.50
Term. strip - TS-206
Cost 1.58
Qty. needed 1
Ext. cost 1.58
9 volt battery snap - BST-3
Cost 4/1.00
Qty. needed 2
Ext. cost 0.50
Electronic Goldmine:
PIR sensor unit - G4567
Cost 5.95
Qty. needed 1
Ext. cost 5.95
Misc. stuff - estimated cost:
Solder 0.10
22 gauge wire 0.25
9 volt battery 2/.99 at Big Lots - 2 required
I have a how-to for the hack of the PIR sensor almost ready. It's got a lot of pics and is on a MS Word doc. I'll try to get a PDF made to reduce the file size. I have pics of a completed timer board (the circuit drawing comes with the PIR sensor) for any who are interested. PM me and I can send the pictures. And many thanks to DaveintheGrave for finding the cheap PIRs!
All Electronics:
Part / part number
Switch - MTS-4
Cost 4/4.00
Qty. needed 2
Ext. cost 2.00
Relay - RLY-645
Cost 1.50
Qty. needed 1
Ext. cost 1.50
Perf board - PC-3
Cost 1.50
Qty. needed 1
Ext. cost 1.50
Transistor-MPSA13
Cost 5/.50
Qty. needed 1
Ext. cost 0.10
Capacitor-100mfd/35V radial
Cost .27
Qty. needed 1
Ext. cost 0.27
Diode - 1N4148
Cost 15/.99
Qty. needed 1
Ext. cost 0.07
Potentiometer - AP-1M
Cost 0.50
Qty. needed 1
Ext. cost 0.50
Resistor - 470K ohm 1/4 watt
Cost 10/.50
Qty. needed 1
Ext. cost 0.05
Resistor - 1K ohm 1/4 watt
Cost 10/.50
Qty. needed 1
Ext. cost 0.05
Project box - TB-3
Cost 2.50
Qty. needed 2.50
Ext. cost 2.50
Term. strip - TS-206
Cost 1.58
Qty. needed 1
Ext. cost 1.58
9 volt battery snap - BST-3
Cost 4/1.00
Qty. needed 2
Ext. cost 0.50
Electronic Goldmine:
PIR sensor unit - G4567
Cost 5.95
Qty. needed 1
Ext. cost 5.95
Misc. stuff - estimated cost:
Solder 0.10
22 gauge wire 0.25
9 volt battery 2/.99 at Big Lots - 2 required
I have a how-to for the hack of the PIR sensor almost ready. It's got a lot of pics and is on a MS Word doc. I'll try to get a PDF made to reduce the file size. I have pics of a completed timer board (the circuit drawing comes with the PIR sensor) for any who are interested. PM me and I can send the pictures. And many thanks to DaveintheGrave for finding the cheap PIRs!