Welcome to my list of Tuya based battery powered devices. When I gave up on designing my own lighting controller (for the moment that is) I also looked around at what I could commandeer for use as a temperature sensor. As it turn out, most every "smart" temperature sensor uses a cheap temp / humidity combo sensor that is panned by the few people who have looked at its reliability. So I started looking for products based on the ESP8266 (to take advantage of Tasmota/ESPEasy/ESPurna/etc), was battery operated and that I could add a genuine DS18B20 onto. It turns out that there are several versions of door/window sensors that are battery operated and use the Tuya module that is much simpler to solder to than the QFN of the ESP8266. These complete assemblies run as low as $7.00, with free shipping and two AAA batteries - impossible to compete with even if you start with a D1 Mini. When I settle on a wiring system and firmware load, I will add that here also. Here are the modules, which will change as time goes on. Some have more extensive "documentation" than others, which merely means I've spent some quality time with these units. NOTE:
Door Sensor 1SynopsisModule Tuya TYWE3S Power 2 x AAA batteries Price $7.60 + tax, no shipping, Aliexpress Product artwork for searching
Major PartsModule Tuya TYWE3S Power Supply SG Micro SGM6603-3.3 Boost Converter Auxiliary Proc STC Micro STC15W204S Board ImageNotes R5 and C4 form an RC for the EN pin of the module The AUX processor is powered directly from the battery A divider is used for the boost converter’s enable AUX pin 3 to R13 + Enable + R1 to GND R9 to Battery or R12 to GND appear to provide a strapping option to the AUX processor R2 appears to be a bleed down between the boost output and ground Resistor values: R1 - 104 - 100KΩ R2 - 101 - 100Ω R3 - 102 - 1KΩ R4 - 102 - 1KΩ R5 - 103 - 10KΩ R7 - 100 - 10Ω R8 - 100 - 10Ω R9 - 106 - 10MΩ R12 - N.P. R13 - 103 - 10KΩ Door Sensor 2SynopsisModule Tuya TYWE3S Power 2 x AAA batteries Price $8.00 + tax, no shipping, Aliexpress (in lots of 5) Product artwork for searching
Major PartsModule Tuya TYWE3S Power Supply - Auxiliary Proc - Board ImageNotes EN pin of the module has 10K to 3.3V Door Sensor 3SynposisModule Tuya TYWE3S Power 2 x AAA batteries Price $7.00 + tax, no shipping, Aliexpress Product artwork for searching
Major PartsModule Tuya TYWE3S Power Supply - Auxiliary Proc - Board ImageNotes EN pin of the module has 10K to 3.3V |