Contact Sensor 3 - an ESP8266 Door & Window Sensor

An overview video of version 3 of my contact sensor. Get 10 PCBs for $5 USD at https://www.pcbway.com Buy the Contact Sensor - https://store.mrdiy.ca/p/wireless-contact-sensor Source code and schematics - https://gitlab.com/MrDIYca/ultra-low-power-trigger-sensors-version-3 This door and window sensor is built using an ESP8266, ATtiny13a, LDO and a Lithium battery charge controller. Shopping for the battery charger IC? ============================ ■ Amazon - https://geni.us/p6E6 ■ AliExpress - https://s.click.aliexpress.com/e/_AmZsJT My Contact Sensor System Playlist - https://youtube.com/playlist?list=PLLQXRt5zhNC6yoEHmIOEc1OmY48xyGGa7 The links above are usually affiliate links that support the channel (no additional cost for you).