Looking to electrically power a Wyze thermostat using 12 volts DC instead of the normal 24 volts AC. It’s for an off-grid hydronic heating system. I only have Direct Current available, and do not want to use an inefficient 12vDC to 120vAC converter powering a 120vAC to 24vAC step-down transformer - just to get 24vAC at less that 500mA to wastefully power a Wyze thermostat. Looking for an electrical schematic of the thermostats internal components (resistor, capacitors, diodes, transistors, etc.). If I had the units schematic, I could easily determine the feasibility of running it’s power supply circuit with Direct Current. This would save me time ‘reinventing the wheel’. Thank you for anyone’s help.
Here are internal pictures from the FCC filing. Unfortunately the block diagram and schematics were submitted as permanently confidential and cannot be viewed.
I see 3.3v and 5v test points, maybe you could inject the right voltages into those points to bypass the power supply circuitry. Alternatively, you could try injecting 24V DC into Rc and C (with C being negative) and see if it will power up. The relay coils might require 24V to latch securely.
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YES it will work on 12v DC. I use it in my RV that is all 12v