Ira Schonfeld
Published © GPL3+

Differential Thermostat (Relative Thermostat)

This will turn something on/off based on a difference in 2 temperature readings. Great for controlling fans, circulators, etc.

IntermediateProtip8 hours341
Differential Thermostat (Relative Thermostat)

Things used in this project

Hardware components

Capacitor 1000 µF
Capacitor 1000 µF
×1
Capacitor 10 µF
Capacitor 10 µF
×1
0.1 uf capacitor
×2
1n4001 Diode
×4
LM7812 Voltage Regulator
×1
Resistor 1k ohm
Resistor 1k ohm
×2
10K NTC Thermistor
×2
5K Potentiometer
×1
MC1458 Op Amp
×1
Resistor 220 ohm
Resistor 220 ohm
×1
12K Ohm Resistor
×1
Resistor 2.21k ohm
Resistor 2.21k ohm
×1
2N3904 or 2N2222 Transistor
×1
Relay, 12V 400 Ohm, 120V Contract SPDT
×1
Duplex Outlet 120V
×1
120 Plug w/cord
×1
Electrical box, deep
×1
15-18V AC Power Adapter
×1
3A Fuse, 120V
×1
LED (generic)
LED (generic)
×1

Story

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Schematics

Schematic

Credits

Ira Schonfeld

Ira Schonfeld

1 project • 2 followers
I have completed several projects using Arduino boards for useful hacks around the house. And I 3D print cases/components for them.
Thanks to solaffect.com.

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