• on Test & Measurement
  • Published in issue 1/2018 on page 86
About the article

Wi-Fi Desktop Thermostat

Flexible and programmable temperature control

Based on a Labs project | February 2018 | Find it here
Wi-Fi Desktop Thermostat
Thermostats are everywhere — in the fridge, in the freezer, on the wall, in the car, everywhere are thermostats except on my desk. Sometimes I want a thermostat on my desk to control, say, a fan because it’s too hot in the room. It may also happen that I need a thermostat to switch off an electric stove when the liquid I am heating has reached a certain temperature, or start a pump when it becomes too cold.
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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
Component list
From the Store
160269-1: PCB of the thermostat

Component List
SMD 0805, 0.1W
R12 = 0Ohm
R11 = 100Ohm
R1,R2,R9 = 220Ohm
R6 = 1kOhm
R3,R4,R5,R7,R8,R10 = 10kOhm
SMD 0805
C1,C2,C7,C8 = 100nF
C4 = 1µF
C3,C6 = 10µF, Case A
C5 = 100µF, 16V, Case C
D1 = S1A
IC1 = LD1117S33TR
IC2 = DS18B20
LED1 = green, 3mm
T1 = 2N7002
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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