Kevin Darrah’s Espressif ESP-based trigBoard has undergone a serious upgrade, replacing the original design's ESP8266 microcontroller for the more powerful ESP32 and gaining a range of new features — including user-selectable open/close triggers for wake.
Launched in its original incarnation last year, the trigBoard was designed as a more flexible replacement for Amazon's since-cancelled dash buttons — triggering a custom response when a circuit is closed, and using an ultra-low-power sleep mode to extend battery life as far as possible.
Now in v8, the updated trigBoard is a considerable improvement - and a complete overhaul, claims designer Darrah. The trigBoard v8 is built around Espressif's ESP32, which includes Wi-Fi and Bluetooth connectivity, and comes pre-loaded with a firmware supporting services including Pushover, Push Safer, IFTTT, UDP, and MQTT messaging, along with a programmable real-time clock for time-based wake-ups.
A major feature of the redesign is a considerably lower sleep current, down to 1.5μA based on a 3V battery input. The input voltage range has been extended to 1.8-5V, giving it the ability to run from anything from a 4.2v lithium ion battery down to a pair of AAAs, while the wake trigger input has been modified to work on circuit open, circuit close, or both.