I've been working on building and Android based thermostat lately and would really like to add a purely mechanical safety net to ensure no matter what may happen in the app, the inside temperature will not exceed a safe range. I would like to add a couple of thermal switches to turn the heater off and AC on if the temperature gets over 100F and turn the heater on if the temperature gets below 45F.
I've spent days searching for bimetal switches and thermal fuses and haven't been able to find suitable components. The major US manufactures do not offer a means of buying just one or two switches, you have to get a quote for bulk orders. I found one decent switch from a Chinese manufacturer, but it doesn't carry any US certifications. The only UL certified components I could find are overkill for what I need and too large to reasonably fit within a thermostat. Could anyone suggest specific components I could use?
I've spent days searching for bimetal switches and thermal fuses and haven't been able to find suitable components. The major US manufactures do not offer a means of buying just one or two switches, you have to get a quote for bulk orders. I found one decent switch from a Chinese manufacturer, but it doesn't carry any US certifications. The only UL certified components I could find are overkill for what I need and too large to reasonably fit within a thermostat. Could anyone suggest specific components I could use?