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Wi-Fi Desktop Thermostat: Flexible and Programmable Temperature Control

Wi-Fi Desktop Thermostat: Flexible and Programmable Temperature Control
Wi-Fi Desktop Thermostat: Flexible and Programmable Temperature Control
Labs Project
Based on a Labs project | February 2018 | Find it here
Thermostats are everywhere — in refrigerators, freezers, on walls, and in cars — yet rarely found on a desk. There are times when a desk-mounted thermostat would be useful, such as controlling a fan when a room becomes too warm. It can also serve practical purposes like switching off an electric stove once a liquid reaches a set temperature, or activating a pump when conditions become too cold.
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Materials

Extra info / Update

* 6 preset programs
* 3 custom programs
* Wi-Fi connectivity
* Normally-open (NO) and normally-closed (NC) contacts
* Switches up to 2500 VA

Gerber file

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PCB

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Bill of Materials

From the Store
160269-1: PCB of the thermostat

Component List
Resistors
SMD 0805, 0.1W
R12 = 0Ohm
R11 = 100Ohm
R1,R2,R9 = 220Ohm
R6 = 1kOhm
R3,R4,R5,R7,R8,R10 = 10kOhm
Capacitors
SMD 0805
C1,C2,C7,C8 = 100nF
C4 = 1µF
C3,C6 = 10µF, Case A
C5 = 100µF, 16V, Case C
Semiconductors
D1 = S1A
D2 = MBR120LSFT1G
IC1 = LD1117S33TR
IC2 = DS18B20
LED1 = green, 3mm
T1 = 2N7002
Miscellaneous
K1 = USB-B micro connector
K2 = 3-way PCB screw terminal block, 0.3” pitch
K3 = 6-pin pinheader, 0.1” pitch
MOD1 = ESP-12F
RE1 = SPDT, 5V coil, 10A/250VAC contacts (e.g. Omron G2RL-1)
S3,S4 = switch, tactile feedback, 6x6 mm, gullwing
S1,S2 = switch, tactile feedback, integral LED, Multimec 5GSH93542SMD
Cap for S1 & S2, Multimec 1US16
Extender for S1;S2, 2.5mm, Multimec 2SS09-5.0
Enclosure: Hammond type 1593Qx (x = GY/BK/TBU)
PCB # 160269-1

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