I'm building a project using Adafruit Feather HUZZAH ESP8266 and PIR Motion Sensor. I have everything working, but I'm trying to reduce power consumption as I'm running it off of a 3.7v/600mA battery. The suggestion I found online is to put the ESP8266 into deep sleep mode. This works fine, but I would like to wake it up when motion is detected by the motion detector.
The motion detector is powered independently from the battery and when motion is detected, it produces a HIGH voltage (~3.7V). The way to wake ESP8266 up is via the CHPD pin #3. However, when the ESP8266 is asleep it produces a HIGH voltage on that pin and you need to pull it to ground to wake it up. I'm trying to find a trick to translate the HIGH signal coming off of the motion sensor into a LOW voltage for the CHPD pin.